| Message ID | 20210217221134.2606-3-andrey.konovalov@linaro.org (mailing list archive) |
|---|---|
| State | Superseded |
| Headers | show |
| Series | media: qcom: camss: V4L2_CID_PIXEL_RATE/LINK_FREQ fixes | expand |
Hi Andrey, On Thu, Feb 18, 2021 at 01:11:33AM +0300, Andrey Konovalov wrote: > There are places in the camss driver where camss_get_pixel_clock() is > called to get the pixel rate (using V4L2_CID_PIXEL_RATE control) and to > calculate the link frequency from it. There is a case when this would > not work: when V4L2_CID_PIXEL_RATE gets the rate at which the pixels are > read (sampled) from the sensor's pixel array, and this rate is different > from the pixel transmission rate over the CSI link, the link frequency > value can't be calculated from the pixel rate. One needs to use > V4L2_CID_LINK_FREQ to get the link frequency in this case. > > Replace such calls to camss_get_pixel_clock() with calls to a wrapper > around v4l2_get_link_freq(). v4l2_get_link_freq() tries V4L2_CID_LINK_FREQ > first, and if it is not implemented by the camera sensor driver, falls > back to V4L2_CID_PIXEL_RATE to calculate the link frequency value from. That's nice > > Calls to camss_get_pixel_clock() from vfe_[check,set]_clock_rates() > are left intact as it looks like this VFE clock does depend on the > rate the pixel samples comes out of the camera sensor, not on the > frequency at which the link between the sensor and the CSI receiver > operates. Out of curiosity, you have any idea why this happens ? The patch looks good, fwiw given I don't know the platform: Reviewed-by: Jacopo Mondi <jacopo@jmondi.org> Thanks j > > Signed-off-by: Andrey Konovalov <andrey.konovalov@linaro.org> > Acked-by: Robert Foss <robert.foss@linaro.org> > --- > .../media/platform/qcom/camss/camss-csid.c | 20 +++++------ > .../qcom/camss/camss-csiphy-2ph-1-0.c | 22 ++++++------ > .../qcom/camss/camss-csiphy-3ph-1-0.c | 22 ++++++------ > .../media/platform/qcom/camss/camss-csiphy.c | 36 +++++++++---------- > .../media/platform/qcom/camss/camss-csiphy.h | 2 +- > drivers/media/platform/qcom/camss/camss.c | 23 ++++++++++++ > drivers/media/platform/qcom/camss/camss.h | 2 ++ > 7 files changed, 71 insertions(+), 56 deletions(-) > > diff --git a/drivers/media/platform/qcom/camss/camss-csid.c b/drivers/media/platform/qcom/camss/camss-csid.c > index be3fe76f3dc3..cff9759c9158 100644 > --- a/drivers/media/platform/qcom/camss/camss-csid.c > +++ b/drivers/media/platform/qcom/camss/camss-csid.c > @@ -462,13 +462,17 @@ static irqreturn_t csid_isr(int irq, void *dev) > static int csid_set_clock_rates(struct csid_device *csid) > { > struct device *dev = csid->camss->dev; > - u32 pixel_clock; > + const struct csid_format *fmt; > + s64 link_freq; > int i, j; > int ret; > > - ret = camss_get_pixel_clock(&csid->subdev.entity, &pixel_clock); > - if (ret) > - pixel_clock = 0; > + fmt = csid_get_fmt_entry(csid->formats, csid->nformats, > + csid->fmt[MSM_CSIPHY_PAD_SINK].code); > + link_freq = camss_get_link_freq(&csid->subdev.entity, fmt->bpp, > + csid->phy.lane_cnt); > + if (link_freq < 0) > + link_freq = 0; > > for (i = 0; i < csid->nclocks; i++) { > struct camss_clock *clock = &csid->clock[i]; > @@ -477,13 +481,7 @@ static int csid_set_clock_rates(struct csid_device *csid) > !strcmp(clock->name, "csi1") || > !strcmp(clock->name, "csi2") || > !strcmp(clock->name, "csi3")) { > - const struct csid_format *f = csid_get_fmt_entry( > - csid->formats, > - csid->nformats, > - csid->fmt[MSM_CSIPHY_PAD_SINK].code); > - u8 num_lanes = csid->phy.lane_cnt; > - u64 min_rate = pixel_clock * f->bpp / > - (2 * num_lanes * 4); > + u64 min_rate = link_freq / 4; > long rate; > > camss_add_clock_margin(&min_rate); > diff --git a/drivers/media/platform/qcom/camss/camss-csiphy-2ph-1-0.c b/drivers/media/platform/qcom/camss/camss-csiphy-2ph-1-0.c > index 12bce391d71f..30b454c369ab 100644 > --- a/drivers/media/platform/qcom/camss/camss-csiphy-2ph-1-0.c > +++ b/drivers/media/platform/qcom/camss/camss-csiphy-2ph-1-0.c > @@ -51,16 +51,13 @@ static void csiphy_reset(struct csiphy_device *csiphy) > * > * Helper function to calculate settle count value. This is > * based on the CSI2 T_hs_settle parameter which in turn > - * is calculated based on the CSI2 transmitter pixel clock > - * frequency. > + * is calculated based on the CSI2 transmitter link frequency. > * > - * Return settle count value or 0 if the CSI2 pixel clock > - * frequency is not available > + * Return settle count value or 0 if the CSI2 link frequency > + * is not available > */ > -static u8 csiphy_settle_cnt_calc(u32 pixel_clock, u8 bpp, u8 num_lanes, > - u32 timer_clk_rate) > +static u8 csiphy_settle_cnt_calc(s64 link_freq, u32 timer_clk_rate) > { > - u32 mipi_clock; /* Hz */ > u32 ui; /* ps */ > u32 timer_period; /* ps */ > u32 t_hs_prepare_max; /* ps */ > @@ -68,8 +65,10 @@ static u8 csiphy_settle_cnt_calc(u32 pixel_clock, u8 bpp, u8 num_lanes, > u32 t_hs_settle; /* ps */ > u8 settle_cnt; > > - mipi_clock = pixel_clock * bpp / (2 * num_lanes); > - ui = div_u64(1000000000000LL, mipi_clock); > + if (link_freq <= 0) > + return 0; > + > + ui = div_u64(1000000000000LL, link_freq); > ui /= 2; > t_hs_prepare_max = 85000 + 6 * ui; > t_hs_prepare_zero_min = 145000 + 10 * ui; > @@ -83,15 +82,14 @@ static u8 csiphy_settle_cnt_calc(u32 pixel_clock, u8 bpp, u8 num_lanes, > > static void csiphy_lanes_enable(struct csiphy_device *csiphy, > struct csiphy_config *cfg, > - u32 pixel_clock, u8 bpp, u8 lane_mask) > + s64 link_freq, u8 lane_mask) > { > struct csiphy_lanes_cfg *c = &cfg->csi2->lane_cfg; > u8 settle_cnt; > u8 val, l = 0; > int i = 0; > > - settle_cnt = csiphy_settle_cnt_calc(pixel_clock, bpp, c->num_data, > - csiphy->timer_clk_rate); > + settle_cnt = csiphy_settle_cnt_calc(link_freq, csiphy->timer_clk_rate); > > writel_relaxed(0x1, csiphy->base + > CAMSS_CSI_PHY_GLBL_T_INIT_CFG0); > diff --git a/drivers/media/platform/qcom/camss/camss-csiphy-3ph-1-0.c b/drivers/media/platform/qcom/camss/camss-csiphy-3ph-1-0.c > index 97cb9de85031..da7c3d3f9a10 100644 > --- a/drivers/media/platform/qcom/camss/camss-csiphy-3ph-1-0.c > +++ b/drivers/media/platform/qcom/camss/camss-csiphy-3ph-1-0.c > @@ -107,24 +107,23 @@ static irqreturn_t csiphy_isr(int irq, void *dev) > * > * Helper function to calculate settle count value. This is > * based on the CSI2 T_hs_settle parameter which in turn > - * is calculated based on the CSI2 transmitter pixel clock > - * frequency. > + * is calculated based on the CSI2 transmitter link frequency. > * > - * Return settle count value or 0 if the CSI2 pixel clock > - * frequency is not available > + * Return settle count value or 0 if the CSI2 link frequency > + * is not available > */ > -static u8 csiphy_settle_cnt_calc(u32 pixel_clock, u8 bpp, u8 num_lanes, > - u32 timer_clk_rate) > +static u8 csiphy_settle_cnt_calc(s64 link_freq, u32 timer_clk_rate) > { > - u32 mipi_clock; /* Hz */ > u32 ui; /* ps */ > u32 timer_period; /* ps */ > u32 t_hs_prepare_max; /* ps */ > u32 t_hs_settle; /* ps */ > u8 settle_cnt; > > - mipi_clock = pixel_clock * bpp / (2 * num_lanes); > - ui = div_u64(1000000000000LL, mipi_clock); > + if (link_freq <= 0) > + return 0; > + > + ui = div_u64(1000000000000LL, link_freq); > ui /= 2; > t_hs_prepare_max = 85000 + 6 * ui; > t_hs_settle = t_hs_prepare_max; > @@ -137,15 +136,14 @@ static u8 csiphy_settle_cnt_calc(u32 pixel_clock, u8 bpp, u8 num_lanes, > > static void csiphy_lanes_enable(struct csiphy_device *csiphy, > struct csiphy_config *cfg, > - u32 pixel_clock, u8 bpp, u8 lane_mask) > + s64 link_freq, u8 lane_mask) > { > struct csiphy_lanes_cfg *c = &cfg->csi2->lane_cfg; > u8 settle_cnt; > u8 val, l = 0; > int i; > > - settle_cnt = csiphy_settle_cnt_calc(pixel_clock, bpp, c->num_data, > - csiphy->timer_clk_rate); > + settle_cnt = csiphy_settle_cnt_calc(link_freq, csiphy->timer_clk_rate); > > val = BIT(c->clk.pos); > for (i = 0; i < c->num_data; i++) > diff --git a/drivers/media/platform/qcom/camss/camss-csiphy.c b/drivers/media/platform/qcom/camss/camss-csiphy.c > index 509c9a59c09c..40384d7ca78c 100644 > --- a/drivers/media/platform/qcom/camss/camss-csiphy.c > +++ b/drivers/media/platform/qcom/camss/camss-csiphy.c > @@ -102,23 +102,23 @@ static u8 csiphy_get_bpp(const struct csiphy_format *formats, > static int csiphy_set_clock_rates(struct csiphy_device *csiphy) > { > struct device *dev = csiphy->camss->dev; > - u32 pixel_clock; > + s64 link_freq; > int i, j; > int ret; > > - ret = camss_get_pixel_clock(&csiphy->subdev.entity, &pixel_clock); > - if (ret) > - pixel_clock = 0; > + u8 bpp = csiphy_get_bpp(csiphy->formats, csiphy->nformats, > + csiphy->fmt[MSM_CSIPHY_PAD_SINK].code); > + u8 num_lanes = csiphy->cfg.csi2->lane_cfg.num_data; > + > + link_freq = camss_get_link_freq(&csiphy->subdev.entity, bpp, num_lanes); > + if (link_freq < 0) > + link_freq = 0; > > for (i = 0; i < csiphy->nclocks; i++) { > struct camss_clock *clock = &csiphy->clock[i]; > > if (csiphy->rate_set[i]) { > - u8 bpp = csiphy_get_bpp(csiphy->formats, > - csiphy->nformats, > - csiphy->fmt[MSM_CSIPHY_PAD_SINK].code); > - u8 num_lanes = csiphy->cfg.csi2->lane_cfg.num_data; > - u64 min_rate = pixel_clock * bpp / (2 * num_lanes * 4); > + u64 min_rate = link_freq / 4; > long round_rate; > > camss_add_clock_margin(&min_rate); > @@ -238,22 +238,18 @@ static u8 csiphy_get_lane_mask(struct csiphy_lanes_cfg *lane_cfg) > static int csiphy_stream_on(struct csiphy_device *csiphy) > { > struct csiphy_config *cfg = &csiphy->cfg; > - u32 pixel_clock; > + s64 link_freq; > u8 lane_mask = csiphy_get_lane_mask(&cfg->csi2->lane_cfg); > u8 bpp = csiphy_get_bpp(csiphy->formats, csiphy->nformats, > csiphy->fmt[MSM_CSIPHY_PAD_SINK].code); > + u8 num_lanes = csiphy->cfg.csi2->lane_cfg.num_data; > u8 val; > - int ret; > > - ret = camss_get_pixel_clock(&csiphy->subdev.entity, &pixel_clock); > - if (ret) { > - dev_err(csiphy->camss->dev, > - "Cannot get CSI2 transmitter's pixel clock\n"); > - return -EINVAL; > - } > - if (!pixel_clock) { > + link_freq = camss_get_link_freq(&csiphy->subdev.entity, bpp, num_lanes); > + > + if (link_freq < 0) { > dev_err(csiphy->camss->dev, > - "Got pixel clock == 0, cannot continue\n"); > + "Cannot get CSI2 transmitter's link frequency\n"); > return -EINVAL; > } > > @@ -268,7 +264,7 @@ static int csiphy_stream_on(struct csiphy_device *csiphy) > writel_relaxed(val, csiphy->base_clk_mux); > wmb(); > > - csiphy->ops->lanes_enable(csiphy, cfg, pixel_clock, bpp, lane_mask); > + csiphy->ops->lanes_enable(csiphy, cfg, link_freq, lane_mask); > > return 0; > } > diff --git a/drivers/media/platform/qcom/camss/camss-csiphy.h b/drivers/media/platform/qcom/camss/camss-csiphy.h > index f7967ef836dc..d71b8bc6ec00 100644 > --- a/drivers/media/platform/qcom/camss/camss-csiphy.h > +++ b/drivers/media/platform/qcom/camss/camss-csiphy.h > @@ -50,7 +50,7 @@ struct csiphy_hw_ops { > void (*reset)(struct csiphy_device *csiphy); > void (*lanes_enable)(struct csiphy_device *csiphy, > struct csiphy_config *cfg, > - u32 pixel_clock, u8 bpp, u8 lane_mask); > + s64 link_freq, u8 lane_mask); > void (*lanes_disable)(struct csiphy_device *csiphy, > struct csiphy_config *cfg); > irqreturn_t (*isr)(int irq, void *dev); > diff --git a/drivers/media/platform/qcom/camss/camss.c b/drivers/media/platform/qcom/camss/camss.c > index 7c0f669f8aa6..eb8fb8c34acd 100644 > --- a/drivers/media/platform/qcom/camss/camss.c > +++ b/drivers/media/platform/qcom/camss/camss.c > @@ -548,6 +548,29 @@ struct media_entity *camss_find_sensor(struct media_entity *entity) > } > } > > +/** > + * camss_get_link_freq - Get link frequency from sensor > + * @entity: Media entity in the current pipeline > + * @bpp: Number of bits per pixel for the current format > + * @lanes: Number of lanes in the link to the sensor > + * > + * Return link frequency on success or a negative error code otherwise > + */ > +s64 camss_get_link_freq(struct media_entity *entity, unsigned int bpp, > + unsigned int lanes) > +{ > + struct media_entity *sensor; > + struct v4l2_subdev *subdev; > + > + sensor = camss_find_sensor(entity); > + if (!sensor) > + return -ENODEV; > + > + subdev = media_entity_to_v4l2_subdev(sensor); > + > + return v4l2_get_link_freq(subdev->ctrl_handler, bpp, 2 * lanes); > +} > + > /* > * camss_get_pixel_clock - Get pixel clock rate from sensor > * @entity: Media entity in the current pipeline > diff --git a/drivers/media/platform/qcom/camss/camss.h b/drivers/media/platform/qcom/camss/camss.h > index 3a0484683cd6..86cdc25189eb 100644 > --- a/drivers/media/platform/qcom/camss/camss.h > +++ b/drivers/media/platform/qcom/camss/camss.h > @@ -108,6 +108,8 @@ int camss_enable_clocks(int nclocks, struct camss_clock *clock, > struct device *dev); > void camss_disable_clocks(int nclocks, struct camss_clock *clock); > struct media_entity *camss_find_sensor(struct media_entity *entity); > +s64 camss_get_link_freq(struct media_entity *entity, unsigned int bpp, > + unsigned int lanes); > int camss_get_pixel_clock(struct media_entity *entity, u32 *pixel_clock); > int camss_pm_domain_on(struct camss *camss, int id); > void camss_pm_domain_off(struct camss *camss, int id); > -- > 2.17.1 >
Hi Jacopo, On 18.02.2021 11:07, Jacopo Mondi wrote: > Hi Andrey, > > On Thu, Feb 18, 2021 at 01:11:33AM +0300, Andrey Konovalov wrote: >> There are places in the camss driver where camss_get_pixel_clock() is >> called to get the pixel rate (using V4L2_CID_PIXEL_RATE control) and to >> calculate the link frequency from it. There is a case when this would >> not work: when V4L2_CID_PIXEL_RATE gets the rate at which the pixels are >> read (sampled) from the sensor's pixel array, and this rate is different >> from the pixel transmission rate over the CSI link, the link frequency >> value can't be calculated from the pixel rate. One needs to use >> V4L2_CID_LINK_FREQ to get the link frequency in this case. >> >> Replace such calls to camss_get_pixel_clock() with calls to a wrapper >> around v4l2_get_link_freq(). v4l2_get_link_freq() tries V4L2_CID_LINK_FREQ >> first, and if it is not implemented by the camera sensor driver, falls >> back to V4L2_CID_PIXEL_RATE to calculate the link frequency value from. > > That's nice > >> >> Calls to camss_get_pixel_clock() from vfe_[check,set]_clock_rates() >> are left intact as it looks like this VFE clock does depend on the >> rate the pixel samples comes out of the camera sensor, not on the >> frequency at which the link between the sensor and the CSI receiver >> operates. > > Out of curiosity, you have any idea why this happens ? Unfortunately no. There are no any details in the public datasheet on that - just the formula itself (less than 1 line of text). > The patch looks good, fwiw given I don't know the platform: > Reviewed-by: Jacopo Mondi <jacopo@jmondi.org> Thanks! -- Andrey > Thanks > j >> >> Signed-off-by: Andrey Konovalov <andrey.konovalov@linaro.org> >> Acked-by: Robert Foss <robert.foss@linaro.org> >> --- >> .../media/platform/qcom/camss/camss-csid.c | 20 +++++------ >> .../qcom/camss/camss-csiphy-2ph-1-0.c | 22 ++++++------ >> .../qcom/camss/camss-csiphy-3ph-1-0.c | 22 ++++++------ >> .../media/platform/qcom/camss/camss-csiphy.c | 36 +++++++++---------- >> .../media/platform/qcom/camss/camss-csiphy.h | 2 +- >> drivers/media/platform/qcom/camss/camss.c | 23 ++++++++++++ >> drivers/media/platform/qcom/camss/camss.h | 2 ++ >> 7 files changed, 71 insertions(+), 56 deletions(-) >> >> diff --git a/drivers/media/platform/qcom/camss/camss-csid.c b/drivers/media/platform/qcom/camss/camss-csid.c >> index be3fe76f3dc3..cff9759c9158 100644 >> --- a/drivers/media/platform/qcom/camss/camss-csid.c >> +++ b/drivers/media/platform/qcom/camss/camss-csid.c >> @@ -462,13 +462,17 @@ static irqreturn_t csid_isr(int irq, void *dev) >> static int csid_set_clock_rates(struct csid_device *csid) >> { >> struct device *dev = csid->camss->dev; >> - u32 pixel_clock; >> + const struct csid_format *fmt; >> + s64 link_freq; >> int i, j; >> int ret; >> >> - ret = camss_get_pixel_clock(&csid->subdev.entity, &pixel_clock); >> - if (ret) >> - pixel_clock = 0; >> + fmt = csid_get_fmt_entry(csid->formats, csid->nformats, >> + csid->fmt[MSM_CSIPHY_PAD_SINK].code); >> + link_freq = camss_get_link_freq(&csid->subdev.entity, fmt->bpp, >> + csid->phy.lane_cnt); >> + if (link_freq < 0) >> + link_freq = 0; >> >> for (i = 0; i < csid->nclocks; i++) { >> struct camss_clock *clock = &csid->clock[i]; >> @@ -477,13 +481,7 @@ static int csid_set_clock_rates(struct csid_device *csid) >> !strcmp(clock->name, "csi1") || >> !strcmp(clock->name, "csi2") || >> !strcmp(clock->name, "csi3")) { >> - const struct csid_format *f = csid_get_fmt_entry( >> - csid->formats, >> - csid->nformats, >> - csid->fmt[MSM_CSIPHY_PAD_SINK].code); >> - u8 num_lanes = csid->phy.lane_cnt; >> - u64 min_rate = pixel_clock * f->bpp / >> - (2 * num_lanes * 4); >> + u64 min_rate = link_freq / 4; >> long rate; >> >> camss_add_clock_margin(&min_rate); >> diff --git a/drivers/media/platform/qcom/camss/camss-csiphy-2ph-1-0.c b/drivers/media/platform/qcom/camss/camss-csiphy-2ph-1-0.c >> index 12bce391d71f..30b454c369ab 100644 >> --- a/drivers/media/platform/qcom/camss/camss-csiphy-2ph-1-0.c >> +++ b/drivers/media/platform/qcom/camss/camss-csiphy-2ph-1-0.c >> @@ -51,16 +51,13 @@ static void csiphy_reset(struct csiphy_device *csiphy) >> * >> * Helper function to calculate settle count value. This is >> * based on the CSI2 T_hs_settle parameter which in turn >> - * is calculated based on the CSI2 transmitter pixel clock >> - * frequency. >> + * is calculated based on the CSI2 transmitter link frequency. >> * >> - * Return settle count value or 0 if the CSI2 pixel clock >> - * frequency is not available >> + * Return settle count value or 0 if the CSI2 link frequency >> + * is not available >> */ >> -static u8 csiphy_settle_cnt_calc(u32 pixel_clock, u8 bpp, u8 num_lanes, >> - u32 timer_clk_rate) >> +static u8 csiphy_settle_cnt_calc(s64 link_freq, u32 timer_clk_rate) >> { >> - u32 mipi_clock; /* Hz */ >> u32 ui; /* ps */ >> u32 timer_period; /* ps */ >> u32 t_hs_prepare_max; /* ps */ >> @@ -68,8 +65,10 @@ static u8 csiphy_settle_cnt_calc(u32 pixel_clock, u8 bpp, u8 num_lanes, >> u32 t_hs_settle; /* ps */ >> u8 settle_cnt; >> >> - mipi_clock = pixel_clock * bpp / (2 * num_lanes); >> - ui = div_u64(1000000000000LL, mipi_clock); >> + if (link_freq <= 0) >> + return 0; >> + >> + ui = div_u64(1000000000000LL, link_freq); >> ui /= 2; >> t_hs_prepare_max = 85000 + 6 * ui; >> t_hs_prepare_zero_min = 145000 + 10 * ui; >> @@ -83,15 +82,14 @@ static u8 csiphy_settle_cnt_calc(u32 pixel_clock, u8 bpp, u8 num_lanes, >> >> static void csiphy_lanes_enable(struct csiphy_device *csiphy, >> struct csiphy_config *cfg, >> - u32 pixel_clock, u8 bpp, u8 lane_mask) >> + s64 link_freq, u8 lane_mask) >> { >> struct csiphy_lanes_cfg *c = &cfg->csi2->lane_cfg; >> u8 settle_cnt; >> u8 val, l = 0; >> int i = 0; >> >> - settle_cnt = csiphy_settle_cnt_calc(pixel_clock, bpp, c->num_data, >> - csiphy->timer_clk_rate); >> + settle_cnt = csiphy_settle_cnt_calc(link_freq, csiphy->timer_clk_rate); >> >> writel_relaxed(0x1, csiphy->base + >> CAMSS_CSI_PHY_GLBL_T_INIT_CFG0); >> diff --git a/drivers/media/platform/qcom/camss/camss-csiphy-3ph-1-0.c b/drivers/media/platform/qcom/camss/camss-csiphy-3ph-1-0.c >> index 97cb9de85031..da7c3d3f9a10 100644 >> --- a/drivers/media/platform/qcom/camss/camss-csiphy-3ph-1-0.c >> +++ b/drivers/media/platform/qcom/camss/camss-csiphy-3ph-1-0.c >> @@ -107,24 +107,23 @@ static irqreturn_t csiphy_isr(int irq, void *dev) >> * >> * Helper function to calculate settle count value. This is >> * based on the CSI2 T_hs_settle parameter which in turn >> - * is calculated based on the CSI2 transmitter pixel clock >> - * frequency. >> + * is calculated based on the CSI2 transmitter link frequency. >> * >> - * Return settle count value or 0 if the CSI2 pixel clock >> - * frequency is not available >> + * Return settle count value or 0 if the CSI2 link frequency >> + * is not available >> */ >> -static u8 csiphy_settle_cnt_calc(u32 pixel_clock, u8 bpp, u8 num_lanes, >> - u32 timer_clk_rate) >> +static u8 csiphy_settle_cnt_calc(s64 link_freq, u32 timer_clk_rate) >> { >> - u32 mipi_clock; /* Hz */ >> u32 ui; /* ps */ >> u32 timer_period; /* ps */ >> u32 t_hs_prepare_max; /* ps */ >> u32 t_hs_settle; /* ps */ >> u8 settle_cnt; >> >> - mipi_clock = pixel_clock * bpp / (2 * num_lanes); >> - ui = div_u64(1000000000000LL, mipi_clock); >> + if (link_freq <= 0) >> + return 0; >> + >> + ui = div_u64(1000000000000LL, link_freq); >> ui /= 2; >> t_hs_prepare_max = 85000 + 6 * ui; >> t_hs_settle = t_hs_prepare_max; >> @@ -137,15 +136,14 @@ static u8 csiphy_settle_cnt_calc(u32 pixel_clock, u8 bpp, u8 num_lanes, >> >> static void csiphy_lanes_enable(struct csiphy_device *csiphy, >> struct csiphy_config *cfg, >> - u32 pixel_clock, u8 bpp, u8 lane_mask) >> + s64 link_freq, u8 lane_mask) >> { >> struct csiphy_lanes_cfg *c = &cfg->csi2->lane_cfg; >> u8 settle_cnt; >> u8 val, l = 0; >> int i; >> >> - settle_cnt = csiphy_settle_cnt_calc(pixel_clock, bpp, c->num_data, >> - csiphy->timer_clk_rate); >> + settle_cnt = csiphy_settle_cnt_calc(link_freq, csiphy->timer_clk_rate); >> >> val = BIT(c->clk.pos); >> for (i = 0; i < c->num_data; i++) >> diff --git a/drivers/media/platform/qcom/camss/camss-csiphy.c b/drivers/media/platform/qcom/camss/camss-csiphy.c >> index 509c9a59c09c..40384d7ca78c 100644 >> --- a/drivers/media/platform/qcom/camss/camss-csiphy.c >> +++ b/drivers/media/platform/qcom/camss/camss-csiphy.c >> @@ -102,23 +102,23 @@ static u8 csiphy_get_bpp(const struct csiphy_format *formats, >> static int csiphy_set_clock_rates(struct csiphy_device *csiphy) >> { >> struct device *dev = csiphy->camss->dev; >> - u32 pixel_clock; >> + s64 link_freq; >> int i, j; >> int ret; >> >> - ret = camss_get_pixel_clock(&csiphy->subdev.entity, &pixel_clock); >> - if (ret) >> - pixel_clock = 0; >> + u8 bpp = csiphy_get_bpp(csiphy->formats, csiphy->nformats, >> + csiphy->fmt[MSM_CSIPHY_PAD_SINK].code); >> + u8 num_lanes = csiphy->cfg.csi2->lane_cfg.num_data; >> + >> + link_freq = camss_get_link_freq(&csiphy->subdev.entity, bpp, num_lanes); >> + if (link_freq < 0) >> + link_freq = 0; >> >> for (i = 0; i < csiphy->nclocks; i++) { >> struct camss_clock *clock = &csiphy->clock[i]; >> >> if (csiphy->rate_set[i]) { >> - u8 bpp = csiphy_get_bpp(csiphy->formats, >> - csiphy->nformats, >> - csiphy->fmt[MSM_CSIPHY_PAD_SINK].code); >> - u8 num_lanes = csiphy->cfg.csi2->lane_cfg.num_data; >> - u64 min_rate = pixel_clock * bpp / (2 * num_lanes * 4); >> + u64 min_rate = link_freq / 4; >> long round_rate; >> >> camss_add_clock_margin(&min_rate); >> @@ -238,22 +238,18 @@ static u8 csiphy_get_lane_mask(struct csiphy_lanes_cfg *lane_cfg) >> static int csiphy_stream_on(struct csiphy_device *csiphy) >> { >> struct csiphy_config *cfg = &csiphy->cfg; >> - u32 pixel_clock; >> + s64 link_freq; >> u8 lane_mask = csiphy_get_lane_mask(&cfg->csi2->lane_cfg); >> u8 bpp = csiphy_get_bpp(csiphy->formats, csiphy->nformats, >> csiphy->fmt[MSM_CSIPHY_PAD_SINK].code); >> + u8 num_lanes = csiphy->cfg.csi2->lane_cfg.num_data; >> u8 val; >> - int ret; >> >> - ret = camss_get_pixel_clock(&csiphy->subdev.entity, &pixel_clock); >> - if (ret) { >> - dev_err(csiphy->camss->dev, >> - "Cannot get CSI2 transmitter's pixel clock\n"); >> - return -EINVAL; >> - } >> - if (!pixel_clock) { >> + link_freq = camss_get_link_freq(&csiphy->subdev.entity, bpp, num_lanes); >> + >> + if (link_freq < 0) { >> dev_err(csiphy->camss->dev, >> - "Got pixel clock == 0, cannot continue\n"); >> + "Cannot get CSI2 transmitter's link frequency\n"); >> return -EINVAL; >> } >> >> @@ -268,7 +264,7 @@ static int csiphy_stream_on(struct csiphy_device *csiphy) >> writel_relaxed(val, csiphy->base_clk_mux); >> wmb(); >> >> - csiphy->ops->lanes_enable(csiphy, cfg, pixel_clock, bpp, lane_mask); >> + csiphy->ops->lanes_enable(csiphy, cfg, link_freq, lane_mask); >> >> return 0; >> } >> diff --git a/drivers/media/platform/qcom/camss/camss-csiphy.h b/drivers/media/platform/qcom/camss/camss-csiphy.h >> index f7967ef836dc..d71b8bc6ec00 100644 >> --- a/drivers/media/platform/qcom/camss/camss-csiphy.h >> +++ b/drivers/media/platform/qcom/camss/camss-csiphy.h >> @@ -50,7 +50,7 @@ struct csiphy_hw_ops { >> void (*reset)(struct csiphy_device *csiphy); >> void (*lanes_enable)(struct csiphy_device *csiphy, >> struct csiphy_config *cfg, >> - u32 pixel_clock, u8 bpp, u8 lane_mask); >> + s64 link_freq, u8 lane_mask); >> void (*lanes_disable)(struct csiphy_device *csiphy, >> struct csiphy_config *cfg); >> irqreturn_t (*isr)(int irq, void *dev); >> diff --git a/drivers/media/platform/qcom/camss/camss.c b/drivers/media/platform/qcom/camss/camss.c >> index 7c0f669f8aa6..eb8fb8c34acd 100644 >> --- a/drivers/media/platform/qcom/camss/camss.c >> +++ b/drivers/media/platform/qcom/camss/camss.c >> @@ -548,6 +548,29 @@ struct media_entity *camss_find_sensor(struct media_entity *entity) >> } >> } >> >> +/** >> + * camss_get_link_freq - Get link frequency from sensor >> + * @entity: Media entity in the current pipeline >> + * @bpp: Number of bits per pixel for the current format >> + * @lanes: Number of lanes in the link to the sensor >> + * >> + * Return link frequency on success or a negative error code otherwise >> + */ >> +s64 camss_get_link_freq(struct media_entity *entity, unsigned int bpp, >> + unsigned int lanes) >> +{ >> + struct media_entity *sensor; >> + struct v4l2_subdev *subdev; >> + >> + sensor = camss_find_sensor(entity); >> + if (!sensor) >> + return -ENODEV; >> + >> + subdev = media_entity_to_v4l2_subdev(sensor); >> + >> + return v4l2_get_link_freq(subdev->ctrl_handler, bpp, 2 * lanes); >> +} >> + >> /* >> * camss_get_pixel_clock - Get pixel clock rate from sensor >> * @entity: Media entity in the current pipeline >> diff --git a/drivers/media/platform/qcom/camss/camss.h b/drivers/media/platform/qcom/camss/camss.h >> index 3a0484683cd6..86cdc25189eb 100644 >> --- a/drivers/media/platform/qcom/camss/camss.h >> +++ b/drivers/media/platform/qcom/camss/camss.h >> @@ -108,6 +108,8 @@ int camss_enable_clocks(int nclocks, struct camss_clock *clock, >> struct device *dev); >> void camss_disable_clocks(int nclocks, struct camss_clock *clock); >> struct media_entity *camss_find_sensor(struct media_entity *entity); >> +s64 camss_get_link_freq(struct media_entity *entity, unsigned int bpp, >> + unsigned int lanes); >> int camss_get_pixel_clock(struct media_entity *entity, u32 *pixel_clock); >> int camss_pm_domain_on(struct camss *camss, int id); >> void camss_pm_domain_off(struct camss *camss, int id); >> -- >> 2.17.1 >>
diff --git a/drivers/media/platform/qcom/camss/camss-csid.c b/drivers/media/platform/qcom/camss/camss-csid.c index be3fe76f3dc3..cff9759c9158 100644 --- a/drivers/media/platform/qcom/camss/camss-csid.c +++ b/drivers/media/platform/qcom/camss/camss-csid.c @@ -462,13 +462,17 @@ static irqreturn_t csid_isr(int irq, void *dev) static int csid_set_clock_rates(struct csid_device *csid) { struct device *dev = csid->camss->dev; - u32 pixel_clock; + const struct csid_format *fmt; + s64 link_freq; int i, j; int ret; - ret = camss_get_pixel_clock(&csid->subdev.entity, &pixel_clock); - if (ret) - pixel_clock = 0; + fmt = csid_get_fmt_entry(csid->formats, csid->nformats, + csid->fmt[MSM_CSIPHY_PAD_SINK].code); + link_freq = camss_get_link_freq(&csid->subdev.entity, fmt->bpp, + csid->phy.lane_cnt); + if (link_freq < 0) + link_freq = 0; for (i = 0; i < csid->nclocks; i++) { struct camss_clock *clock = &csid->clock[i]; @@ -477,13 +481,7 @@ static int csid_set_clock_rates(struct csid_device *csid) !strcmp(clock->name, "csi1") || !strcmp(clock->name, "csi2") || !strcmp(clock->name, "csi3")) { - const struct csid_format *f = csid_get_fmt_entry( - csid->formats, - csid->nformats, - csid->fmt[MSM_CSIPHY_PAD_SINK].code); - u8 num_lanes = csid->phy.lane_cnt; - u64 min_rate = pixel_clock * f->bpp / - (2 * num_lanes * 4); + u64 min_rate = link_freq / 4; long rate; camss_add_clock_margin(&min_rate); diff --git a/drivers/media/platform/qcom/camss/camss-csiphy-2ph-1-0.c b/drivers/media/platform/qcom/camss/camss-csiphy-2ph-1-0.c index 12bce391d71f..30b454c369ab 100644 --- a/drivers/media/platform/qcom/camss/camss-csiphy-2ph-1-0.c +++ b/drivers/media/platform/qcom/camss/camss-csiphy-2ph-1-0.c @@ -51,16 +51,13 @@ static void csiphy_reset(struct csiphy_device *csiphy) * * Helper function to calculate settle count value. This is * based on the CSI2 T_hs_settle parameter which in turn - * is calculated based on the CSI2 transmitter pixel clock - * frequency. + * is calculated based on the CSI2 transmitter link frequency. * - * Return settle count value or 0 if the CSI2 pixel clock - * frequency is not available + * Return settle count value or 0 if the CSI2 link frequency + * is not available */ -static u8 csiphy_settle_cnt_calc(u32 pixel_clock, u8 bpp, u8 num_lanes, - u32 timer_clk_rate) +static u8 csiphy_settle_cnt_calc(s64 link_freq, u32 timer_clk_rate) { - u32 mipi_clock; /* Hz */ u32 ui; /* ps */ u32 timer_period; /* ps */ u32 t_hs_prepare_max; /* ps */ @@ -68,8 +65,10 @@ static u8 csiphy_settle_cnt_calc(u32 pixel_clock, u8 bpp, u8 num_lanes, u32 t_hs_settle; /* ps */ u8 settle_cnt; - mipi_clock = pixel_clock * bpp / (2 * num_lanes); - ui = div_u64(1000000000000LL, mipi_clock); + if (link_freq <= 0) + return 0; + + ui = div_u64(1000000000000LL, link_freq); ui /= 2; t_hs_prepare_max = 85000 + 6 * ui; t_hs_prepare_zero_min = 145000 + 10 * ui; @@ -83,15 +82,14 @@ static u8 csiphy_settle_cnt_calc(u32 pixel_clock, u8 bpp, u8 num_lanes, static void csiphy_lanes_enable(struct csiphy_device *csiphy, struct csiphy_config *cfg, - u32 pixel_clock, u8 bpp, u8 lane_mask) + s64 link_freq, u8 lane_mask) { struct csiphy_lanes_cfg *c = &cfg->csi2->lane_cfg; u8 settle_cnt; u8 val, l = 0; int i = 0; - settle_cnt = csiphy_settle_cnt_calc(pixel_clock, bpp, c->num_data, - csiphy->timer_clk_rate); + settle_cnt = csiphy_settle_cnt_calc(link_freq, csiphy->timer_clk_rate); writel_relaxed(0x1, csiphy->base + CAMSS_CSI_PHY_GLBL_T_INIT_CFG0); diff --git a/drivers/media/platform/qcom/camss/camss-csiphy-3ph-1-0.c b/drivers/media/platform/qcom/camss/camss-csiphy-3ph-1-0.c index 97cb9de85031..da7c3d3f9a10 100644 --- a/drivers/media/platform/qcom/camss/camss-csiphy-3ph-1-0.c +++ b/drivers/media/platform/qcom/camss/camss-csiphy-3ph-1-0.c @@ -107,24 +107,23 @@ static irqreturn_t csiphy_isr(int irq, void *dev) * * Helper function to calculate settle count value. This is * based on the CSI2 T_hs_settle parameter which in turn - * is calculated based on the CSI2 transmitter pixel clock - * frequency. + * is calculated based on the CSI2 transmitter link frequency. * - * Return settle count value or 0 if the CSI2 pixel clock - * frequency is not available + * Return settle count value or 0 if the CSI2 link frequency + * is not available */ -static u8 csiphy_settle_cnt_calc(u32 pixel_clock, u8 bpp, u8 num_lanes, - u32 timer_clk_rate) +static u8 csiphy_settle_cnt_calc(s64 link_freq, u32 timer_clk_rate) { - u32 mipi_clock; /* Hz */ u32 ui; /* ps */ u32 timer_period; /* ps */ u32 t_hs_prepare_max; /* ps */ u32 t_hs_settle; /* ps */ u8 settle_cnt; - mipi_clock = pixel_clock * bpp / (2 * num_lanes); - ui = div_u64(1000000000000LL, mipi_clock); + if (link_freq <= 0) + return 0; + + ui = div_u64(1000000000000LL, link_freq); ui /= 2; t_hs_prepare_max = 85000 + 6 * ui; t_hs_settle = t_hs_prepare_max; @@ -137,15 +136,14 @@ static u8 csiphy_settle_cnt_calc(u32 pixel_clock, u8 bpp, u8 num_lanes, static void csiphy_lanes_enable(struct csiphy_device *csiphy, struct csiphy_config *cfg, - u32 pixel_clock, u8 bpp, u8 lane_mask) + s64 link_freq, u8 lane_mask) { struct csiphy_lanes_cfg *c = &cfg->csi2->lane_cfg; u8 settle_cnt; u8 val, l = 0; int i; - settle_cnt = csiphy_settle_cnt_calc(pixel_clock, bpp, c->num_data, - csiphy->timer_clk_rate); + settle_cnt = csiphy_settle_cnt_calc(link_freq, csiphy->timer_clk_rate); val = BIT(c->clk.pos); for (i = 0; i < c->num_data; i++) diff --git a/drivers/media/platform/qcom/camss/camss-csiphy.c b/drivers/media/platform/qcom/camss/camss-csiphy.c index 509c9a59c09c..40384d7ca78c 100644 --- a/drivers/media/platform/qcom/camss/camss-csiphy.c +++ b/drivers/media/platform/qcom/camss/camss-csiphy.c @@ -102,23 +102,23 @@ static u8 csiphy_get_bpp(const struct csiphy_format *formats, static int csiphy_set_clock_rates(struct csiphy_device *csiphy) { struct device *dev = csiphy->camss->dev; - u32 pixel_clock; + s64 link_freq; int i, j; int ret; - ret = camss_get_pixel_clock(&csiphy->subdev.entity, &pixel_clock); - if (ret) - pixel_clock = 0; + u8 bpp = csiphy_get_bpp(csiphy->formats, csiphy->nformats, + csiphy->fmt[MSM_CSIPHY_PAD_SINK].code); + u8 num_lanes = csiphy->cfg.csi2->lane_cfg.num_data; + + link_freq = camss_get_link_freq(&csiphy->subdev.entity, bpp, num_lanes); + if (link_freq < 0) + link_freq = 0; for (i = 0; i < csiphy->nclocks; i++) { struct camss_clock *clock = &csiphy->clock[i]; if (csiphy->rate_set[i]) { - u8 bpp = csiphy_get_bpp(csiphy->formats, - csiphy->nformats, - csiphy->fmt[MSM_CSIPHY_PAD_SINK].code); - u8 num_lanes = csiphy->cfg.csi2->lane_cfg.num_data; - u64 min_rate = pixel_clock * bpp / (2 * num_lanes * 4); + u64 min_rate = link_freq / 4; long round_rate; camss_add_clock_margin(&min_rate); @@ -238,22 +238,18 @@ static u8 csiphy_get_lane_mask(struct csiphy_lanes_cfg *lane_cfg) static int csiphy_stream_on(struct csiphy_device *csiphy) { struct csiphy_config *cfg = &csiphy->cfg; - u32 pixel_clock; + s64 link_freq; u8 lane_mask = csiphy_get_lane_mask(&cfg->csi2->lane_cfg); u8 bpp = csiphy_get_bpp(csiphy->formats, csiphy->nformats, csiphy->fmt[MSM_CSIPHY_PAD_SINK].code); + u8 num_lanes = csiphy->cfg.csi2->lane_cfg.num_data; u8 val; - int ret; - ret = camss_get_pixel_clock(&csiphy->subdev.entity, &pixel_clock); - if (ret) { - dev_err(csiphy->camss->dev, - "Cannot get CSI2 transmitter's pixel clock\n"); - return -EINVAL; - } - if (!pixel_clock) { + link_freq = camss_get_link_freq(&csiphy->subdev.entity, bpp, num_lanes); + + if (link_freq < 0) { dev_err(csiphy->camss->dev, - "Got pixel clock == 0, cannot continue\n"); + "Cannot get CSI2 transmitter's link frequency\n"); return -EINVAL; } @@ -268,7 +264,7 @@ static int csiphy_stream_on(struct csiphy_device *csiphy) writel_relaxed(val, csiphy->base_clk_mux); wmb(); - csiphy->ops->lanes_enable(csiphy, cfg, pixel_clock, bpp, lane_mask); + csiphy->ops->lanes_enable(csiphy, cfg, link_freq, lane_mask); return 0; } diff --git a/drivers/media/platform/qcom/camss/camss-csiphy.h b/drivers/media/platform/qcom/camss/camss-csiphy.h index f7967ef836dc..d71b8bc6ec00 100644 --- a/drivers/media/platform/qcom/camss/camss-csiphy.h +++ b/drivers/media/platform/qcom/camss/camss-csiphy.h @@ -50,7 +50,7 @@ struct csiphy_hw_ops { void (*reset)(struct csiphy_device *csiphy); void (*lanes_enable)(struct csiphy_device *csiphy, struct csiphy_config *cfg, - u32 pixel_clock, u8 bpp, u8 lane_mask); + s64 link_freq, u8 lane_mask); void (*lanes_disable)(struct csiphy_device *csiphy, struct csiphy_config *cfg); irqreturn_t (*isr)(int irq, void *dev); diff --git a/drivers/media/platform/qcom/camss/camss.c b/drivers/media/platform/qcom/camss/camss.c index 7c0f669f8aa6..eb8fb8c34acd 100644 --- a/drivers/media/platform/qcom/camss/camss.c +++ b/drivers/media/platform/qcom/camss/camss.c @@ -548,6 +548,29 @@ struct media_entity *camss_find_sensor(struct media_entity *entity) } } +/** + * camss_get_link_freq - Get link frequency from sensor + * @entity: Media entity in the current pipeline + * @bpp: Number of bits per pixel for the current format + * @lanes: Number of lanes in the link to the sensor + * + * Return link frequency on success or a negative error code otherwise + */ +s64 camss_get_link_freq(struct media_entity *entity, unsigned int bpp, + unsigned int lanes) +{ + struct media_entity *sensor; + struct v4l2_subdev *subdev; + + sensor = camss_find_sensor(entity); + if (!sensor) + return -ENODEV; + + subdev = media_entity_to_v4l2_subdev(sensor); + + return v4l2_get_link_freq(subdev->ctrl_handler, bpp, 2 * lanes); +} + /* * camss_get_pixel_clock - Get pixel clock rate from sensor * @entity: Media entity in the current pipeline diff --git a/drivers/media/platform/qcom/camss/camss.h b/drivers/media/platform/qcom/camss/camss.h index 3a0484683cd6..86cdc25189eb 100644 --- a/drivers/media/platform/qcom/camss/camss.h +++ b/drivers/media/platform/qcom/camss/camss.h @@ -108,6 +108,8 @@ int camss_enable_clocks(int nclocks, struct camss_clock *clock, struct device *dev); void camss_disable_clocks(int nclocks, struct camss_clock *clock); struct media_entity *camss_find_sensor(struct media_entity *entity); +s64 camss_get_link_freq(struct media_entity *entity, unsigned int bpp, + unsigned int lanes); int camss_get_pixel_clock(struct media_entity *entity, u32 *pixel_clock); int camss_pm_domain_on(struct camss *camss, int id); void camss_pm_domain_off(struct camss *camss, int id);