| Message ID | 20200508163314.1.Idfa69d5d3fc9623083c0ff78572fea87dccb199c@changeid (mailing list archive) |
|---|---|
| State | New, archived |
| Headers | show |
| Series | drm/bridge: ti-sn65dsi86: Clear old error bits before AUX transfers | expand |
On Fri, May 8, 2020 at 4:33 PM Douglas Anderson <dianders@chromium.org> wrote: > > The AUX channel transfer error bits in the status register are latched > and need to be cleared. Clear them before doing our transfer so we > don't see old bits and get confused. > > Without this patch having a single failure would mean that all future > transfers would look like they failed. > > Fixes: b814ec6d4535 ("drm/bridge: ti-sn65dsi86: Implement AUX channel") > Signed-off-by: Douglas Anderson <dianders@chromium.org> Reviewed-by: Rob Clark <robdclark@gmail.com> > --- > > drivers/gpu/drm/bridge/ti-sn65dsi86.c | 6 ++++++ > 1 file changed, 6 insertions(+) > > diff --git a/drivers/gpu/drm/bridge/ti-sn65dsi86.c b/drivers/gpu/drm/bridge/ti-sn65dsi86.c > index 6ad688b320ae..d865cc2565bc 100644 > --- a/drivers/gpu/drm/bridge/ti-sn65dsi86.c > +++ b/drivers/gpu/drm/bridge/ti-sn65dsi86.c > @@ -827,6 +827,12 @@ static ssize_t ti_sn_aux_transfer(struct drm_dp_aux *aux, > buf[i]); > } > > + /* Clear old status bits before start so we don't get confused */ > + regmap_write(pdata->regmap, SN_AUX_CMD_STATUS_REG, > + AUX_IRQ_STATUS_NAT_I2C_FAIL | > + AUX_IRQ_STATUS_AUX_RPLY_TOUT | > + AUX_IRQ_STATUS_AUX_SHORT); > + > regmap_write(pdata->regmap, SN_AUX_CMD_REG, request_val | AUX_CMD_SEND); > > ret = regmap_read_poll_timeout(pdata->regmap, SN_AUX_CMD_REG, val, > -- > 2.26.2.645.ge9eca65c58-goog > > _______________________________________________ > dri-devel mailing list > dri-devel@lists.freedesktop.org > https://lists.freedesktop.org/mailman/listinfo/dri-devel
On Fri, May 08, 2020 at 04:33:29PM -0700, Douglas Anderson wrote: > The AUX channel transfer error bits in the status register are latched > and need to be cleared. Clear them before doing our transfer so we > don't see old bits and get confused. > > Without this patch having a single failure would mean that all future > transfers would look like they failed. > > Fixes: b814ec6d4535 ("drm/bridge: ti-sn65dsi86: Implement AUX channel") > Signed-off-by: Douglas Anderson <dianders@chromium.org> Applied. Sam > --- > > drivers/gpu/drm/bridge/ti-sn65dsi86.c | 6 ++++++ > 1 file changed, 6 insertions(+) > > diff --git a/drivers/gpu/drm/bridge/ti-sn65dsi86.c b/drivers/gpu/drm/bridge/ti-sn65dsi86.c > index 6ad688b320ae..d865cc2565bc 100644 > --- a/drivers/gpu/drm/bridge/ti-sn65dsi86.c > +++ b/drivers/gpu/drm/bridge/ti-sn65dsi86.c > @@ -827,6 +827,12 @@ static ssize_t ti_sn_aux_transfer(struct drm_dp_aux *aux, > buf[i]); > } > > + /* Clear old status bits before start so we don't get confused */ > + regmap_write(pdata->regmap, SN_AUX_CMD_STATUS_REG, > + AUX_IRQ_STATUS_NAT_I2C_FAIL | > + AUX_IRQ_STATUS_AUX_RPLY_TOUT | > + AUX_IRQ_STATUS_AUX_SHORT); > + > regmap_write(pdata->regmap, SN_AUX_CMD_REG, request_val | AUX_CMD_SEND); > > ret = regmap_read_poll_timeout(pdata->regmap, SN_AUX_CMD_REG, val, > -- > 2.26.2.645.ge9eca65c58-goog > > _______________________________________________ > dri-devel mailing list > dri-devel@lists.freedesktop.org > https://lists.freedesktop.org/mailman/listinfo/dri-devel
diff --git a/drivers/gpu/drm/bridge/ti-sn65dsi86.c b/drivers/gpu/drm/bridge/ti-sn65dsi86.c index 6ad688b320ae..d865cc2565bc 100644 --- a/drivers/gpu/drm/bridge/ti-sn65dsi86.c +++ b/drivers/gpu/drm/bridge/ti-sn65dsi86.c @@ -827,6 +827,12 @@ static ssize_t ti_sn_aux_transfer(struct drm_dp_aux *aux, buf[i]); } + /* Clear old status bits before start so we don't get confused */ + regmap_write(pdata->regmap, SN_AUX_CMD_STATUS_REG, + AUX_IRQ_STATUS_NAT_I2C_FAIL | + AUX_IRQ_STATUS_AUX_RPLY_TOUT | + AUX_IRQ_STATUS_AUX_SHORT); + regmap_write(pdata->regmap, SN_AUX_CMD_REG, request_val | AUX_CMD_SEND); ret = regmap_read_poll_timeout(pdata->regmap, SN_AUX_CMD_REG, val,
The AUX channel transfer error bits in the status register are latched and need to be cleared. Clear them before doing our transfer so we don't see old bits and get confused. Without this patch having a single failure would mean that all future transfers would look like they failed. Fixes: b814ec6d4535 ("drm/bridge: ti-sn65dsi86: Implement AUX channel") Signed-off-by: Douglas Anderson <dianders@chromium.org> --- drivers/gpu/drm/bridge/ti-sn65dsi86.c | 6 ++++++ 1 file changed, 6 insertions(+)