| Message ID | 1384779009-10512-7-git-send-email-tomi.valkeinen@ti.com (mailing list archive) |
|---|---|
| State | New, archived |
| Headers | show |
On Monday 18 November 2013 06:20 PM, Tomi Valkeinen wrote: > Use runtime PM's autosuspend support with delay of 100ms. > > This will prevent the driver from turning the DSS modules off and on > multiple times e.g. when loading the module. Could you explain this a bit more? Are you saying that when we insert the omapdss module, we have a lot of runtime_get/put pairs in probe, which leads to us excessive writing of DISPC the registers during resume, and the autosuspend feature would delay the effect of runtime_put() for a while? Also, do we need to do this for all the platform devices? Could we use autosuspend only for the parent platform device, and the children platform devices don't use it? Or am I understanding things wrongly here? Archit > > Signed-off-by: Tomi Valkeinen <tomi.valkeinen@ti.com> > --- > drivers/video/omap2/dss/dispc.c | 5 ++++- > drivers/video/omap2/dss/dsi.c | 5 ++++- > drivers/video/omap2/dss/dss.c | 5 ++++- > drivers/video/omap2/dss/dss.h | 2 ++ > drivers/video/omap2/dss/hdmi4.c | 5 ++++- > drivers/video/omap2/dss/rfbi.c | 5 ++++- > drivers/video/omap2/dss/venc.c | 5 ++++- > 7 files changed, 26 insertions(+), 6 deletions(-) > > diff --git a/drivers/video/omap2/dss/dispc.c b/drivers/video/omap2/dss/dispc.c > index 58f3626..0643eb0 100644 > --- a/drivers/video/omap2/dss/dispc.c > +++ b/drivers/video/omap2/dss/dispc.c > @@ -258,7 +258,8 @@ void dispc_runtime_put(void) > > DSSDBG("dispc_runtime_put\n"); > > - r = pm_runtime_put_sync(&dispc.pdev->dev); > + pm_runtime_mark_last_busy(&dispc.pdev->dev); > + r = pm_runtime_put_autosuspend(&dispc.pdev->dev); > WARN_ON(r < 0 && r != -ENOSYS); > } > EXPORT_SYMBOL(dispc_runtime_put); > @@ -3440,6 +3441,8 @@ static int __init omap_dispchw_probe(struct platform_device *pdev) > } > > pm_runtime_enable(&pdev->dev); > + pm_runtime_set_autosuspend_delay(&pdev->dev, DSS_AUTOSUSPEND_DELAY); > + pm_runtime_use_autosuspend(&pdev->dev); > > r = dispc_runtime_get(); > if (r) > diff --git a/drivers/video/omap2/dss/dsi.c b/drivers/video/omap2/dss/dsi.c > index 6b30a58..19e4cad 100644 > --- a/drivers/video/omap2/dss/dsi.c > +++ b/drivers/video/omap2/dss/dsi.c > @@ -1110,7 +1110,8 @@ void dsi_runtime_put(struct platform_device *dsidev) > > DSSDBG("dsi_runtime_put\n"); > > - r = pm_runtime_put_sync(&dsi->pdev->dev); > + pm_runtime_mark_last_busy(&dsi->pdev->dev); > + r = pm_runtime_put_autosuspend(&dsi->pdev->dev); > WARN_ON(r < 0 && r != -ENOSYS); > } > > @@ -5416,6 +5417,8 @@ static int omap_dsihw_probe(struct platform_device *dsidev) > return r; > > pm_runtime_enable(&dsidev->dev); > + pm_runtime_set_autosuspend_delay(&dsidev->dev, DSS_AUTOSUSPEND_DELAY); > + pm_runtime_use_autosuspend(&dsidev->dev); > > r = dsi_runtime_get(dsidev); > if (r) > diff --git a/drivers/video/omap2/dss/dss.c b/drivers/video/omap2/dss/dss.c > index fa7bc00..d3b0122 100644 > --- a/drivers/video/omap2/dss/dss.c > +++ b/drivers/video/omap2/dss/dss.c > @@ -689,7 +689,8 @@ static void dss_runtime_put(void) > > DSSDBG("dss_runtime_put\n"); > > - r = pm_runtime_put_sync(&dss.pdev->dev); > + pm_runtime_mark_last_busy(&dss.pdev->dev); > + r = pm_runtime_put_autosuspend(&dss.pdev->dev); > WARN_ON(r < 0 && r != -ENOSYS && r != -EBUSY); > } > > @@ -821,6 +822,8 @@ static int __init omap_dsshw_probe(struct platform_device *pdev) > goto err_setup_clocks; > > pm_runtime_enable(&pdev->dev); > + pm_runtime_set_autosuspend_delay(&pdev->dev, DSS_AUTOSUSPEND_DELAY); > + pm_runtime_use_autosuspend(&pdev->dev); > > r = dss_runtime_get(); > if (r) > diff --git a/drivers/video/omap2/dss/dss.h b/drivers/video/omap2/dss/dss.h > index af83c4d..96505f0 100644 > --- a/drivers/video/omap2/dss/dss.h > +++ b/drivers/video/omap2/dss/dss.h > @@ -73,6 +73,8 @@ > #define FLD_MOD(orig, val, start, end) \ > (((orig) & ~FLD_MASK(start, end)) | FLD_VAL(val, start, end)) > > +#define DSS_AUTOSUSPEND_DELAY 100 /* in ms */ > + > enum dss_io_pad_mode { > DSS_IO_PAD_MODE_RESET, > DSS_IO_PAD_MODE_RFBI, > diff --git a/drivers/video/omap2/dss/hdmi4.c b/drivers/video/omap2/dss/hdmi4.c > index f1a45fe..f255641 100644 > --- a/drivers/video/omap2/dss/hdmi4.c > +++ b/drivers/video/omap2/dss/hdmi4.c > @@ -77,7 +77,8 @@ static void hdmi_runtime_put(void) > > DSSDBG("hdmi_runtime_put\n"); > > - r = pm_runtime_put_sync(&hdmi.pdev->dev); > + pm_runtime_mark_last_busy(&hdmi.pdev->dev); > + r = pm_runtime_put_autosuspend(&hdmi.pdev->dev); > WARN_ON(r < 0 && r != -ENOSYS); > } > > @@ -631,6 +632,8 @@ static int omapdss_hdmihw_probe(struct platform_device *pdev) > } > > pm_runtime_enable(&pdev->dev); > + pm_runtime_set_autosuspend_delay(&pdev->dev, DSS_AUTOSUSPEND_DELAY); > + pm_runtime_use_autosuspend(&pdev->dev); > > hdmi_init_output(pdev); > > diff --git a/drivers/video/omap2/dss/rfbi.c b/drivers/video/omap2/dss/rfbi.c > index 74d3ed1..20dcbfb 100644 > --- a/drivers/video/omap2/dss/rfbi.c > +++ b/drivers/video/omap2/dss/rfbi.c > @@ -147,7 +147,8 @@ static void rfbi_runtime_put(void) > > DSSDBG("rfbi_runtime_put\n"); > > - r = pm_runtime_put_sync(&rfbi.pdev->dev); > + pm_runtime_mark_last_busy(&rfbi.pdev->dev); > + r = pm_runtime_put_autosuspend(&rfbi.pdev->dev); > WARN_ON(r < 0 && r != -ENOSYS); > } > > @@ -981,6 +982,8 @@ static int omap_rfbihw_probe(struct platform_device *pdev) > clk_put(clk); > > pm_runtime_enable(&pdev->dev); > + pm_runtime_set_autosuspend_delay(&pdev->dev, DSS_AUTOSUSPEND_DELAY); > + pm_runtime_use_autosuspend(&pdev->dev); > > r = rfbi_runtime_get(); > if (r) > diff --git a/drivers/video/omap2/dss/venc.c b/drivers/video/omap2/dss/venc.c > index e173961..bbd35bb 100644 > --- a/drivers/video/omap2/dss/venc.c > +++ b/drivers/video/omap2/dss/venc.c > @@ -410,7 +410,8 @@ static void venc_runtime_put(void) > > DSSDBG("venc_runtime_put\n"); > > - r = pm_runtime_put_sync(&venc.pdev->dev); > + pm_runtime_mark_last_busy(&venc.pdev->dev); > + r = pm_runtime_put_autosuspend(&venc.pdev->dev); > WARN_ON(r < 0 && r != -ENOSYS); > } > > @@ -835,6 +836,8 @@ static int omap_venchw_probe(struct platform_device *pdev) > return r; > > pm_runtime_enable(&pdev->dev); > + pm_runtime_set_autosuspend_delay(&pdev->dev, DSS_AUTOSUSPEND_DELAY); > + pm_runtime_use_autosuspend(&pdev->dev); > > r = venc_runtime_get(); > if (r) > -- To unsubscribe from this list: send the line "unsubscribe linux-fbdev" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
On 2013-11-25 03:29, Archit Taneja wrote: > On Monday 18 November 2013 06:20 PM, Tomi Valkeinen wrote: >> Use runtime PM's autosuspend support with delay of 100ms. >> >> This will prevent the driver from turning the DSS modules off and on >> multiple times e.g. when loading the module. > > Could you explain this a bit more? First of all, I'm not quite sure if this is even needed. Things are probably simpler without autosuspend, and we don't have much on/off cycles going on in DSS, so I don't think autosuspend helps much. Maybe it's even bad if somebody wants to enable/disable the DSS HW very quickly. So in the minimum, autosuspend should be made configurable. For now, I think I'll just leave it out. > Are you saying that when we insert the omapdss module, we have a lot of > runtime_get/put pairs in probe, which leads to us excessive writing of > DISPC the registers during resume, and the autosuspend feature would > delay the effect of runtime_put() for a while? For example, first DSS is probed. the dss.c driver will enable dss_core (i.e. the whole DSS hw block), do some register reads/writes, and disable dss_core. Then DISPC is probed, and things go very much like with DSS. And so on. Each submodule will enable and disable the whole DSS, because nothing is keeping the DSS enabled between the probes. With autosuspend, the DSS HW block will stay enabled long enough so the next probe gets ran. > Also, do we need to do this for all the platform devices? Could we use > autosuspend only for the parent platform device, and the children > platform devices don't use it? Or am I understanding things wrongly here? In theory, yes. In practice, if I'm not mistaken, no. When a device is enabled, it'll enable the parent device. When the device is disabled, its parent device will be immediately disabled (if nothing is using it), so autosuspend doesn't have an effect there. So we need to use autosuspend for the child devices. Tomi
diff --git a/drivers/video/omap2/dss/dispc.c b/drivers/video/omap2/dss/dispc.c index 58f3626..0643eb0 100644 --- a/drivers/video/omap2/dss/dispc.c +++ b/drivers/video/omap2/dss/dispc.c @@ -258,7 +258,8 @@ void dispc_runtime_put(void) DSSDBG("dispc_runtime_put\n"); - r = pm_runtime_put_sync(&dispc.pdev->dev); + pm_runtime_mark_last_busy(&dispc.pdev->dev); + r = pm_runtime_put_autosuspend(&dispc.pdev->dev); WARN_ON(r < 0 && r != -ENOSYS); } EXPORT_SYMBOL(dispc_runtime_put); @@ -3440,6 +3441,8 @@ static int __init omap_dispchw_probe(struct platform_device *pdev) } pm_runtime_enable(&pdev->dev); + pm_runtime_set_autosuspend_delay(&pdev->dev, DSS_AUTOSUSPEND_DELAY); + pm_runtime_use_autosuspend(&pdev->dev); r = dispc_runtime_get(); if (r) diff --git a/drivers/video/omap2/dss/dsi.c b/drivers/video/omap2/dss/dsi.c index 6b30a58..19e4cad 100644 --- a/drivers/video/omap2/dss/dsi.c +++ b/drivers/video/omap2/dss/dsi.c @@ -1110,7 +1110,8 @@ void dsi_runtime_put(struct platform_device *dsidev) DSSDBG("dsi_runtime_put\n"); - r = pm_runtime_put_sync(&dsi->pdev->dev); + pm_runtime_mark_last_busy(&dsi->pdev->dev); + r = pm_runtime_put_autosuspend(&dsi->pdev->dev); WARN_ON(r < 0 && r != -ENOSYS); } @@ -5416,6 +5417,8 @@ static int omap_dsihw_probe(struct platform_device *dsidev) return r; pm_runtime_enable(&dsidev->dev); + pm_runtime_set_autosuspend_delay(&dsidev->dev, DSS_AUTOSUSPEND_DELAY); + pm_runtime_use_autosuspend(&dsidev->dev); r = dsi_runtime_get(dsidev); if (r) diff --git a/drivers/video/omap2/dss/dss.c b/drivers/video/omap2/dss/dss.c index fa7bc00..d3b0122 100644 --- a/drivers/video/omap2/dss/dss.c +++ b/drivers/video/omap2/dss/dss.c @@ -689,7 +689,8 @@ static void dss_runtime_put(void) DSSDBG("dss_runtime_put\n"); - r = pm_runtime_put_sync(&dss.pdev->dev); + pm_runtime_mark_last_busy(&dss.pdev->dev); + r = pm_runtime_put_autosuspend(&dss.pdev->dev); WARN_ON(r < 0 && r != -ENOSYS && r != -EBUSY); } @@ -821,6 +822,8 @@ static int __init omap_dsshw_probe(struct platform_device *pdev) goto err_setup_clocks; pm_runtime_enable(&pdev->dev); + pm_runtime_set_autosuspend_delay(&pdev->dev, DSS_AUTOSUSPEND_DELAY); + pm_runtime_use_autosuspend(&pdev->dev); r = dss_runtime_get(); if (r) diff --git a/drivers/video/omap2/dss/dss.h b/drivers/video/omap2/dss/dss.h index af83c4d..96505f0 100644 --- a/drivers/video/omap2/dss/dss.h +++ b/drivers/video/omap2/dss/dss.h @@ -73,6 +73,8 @@ #define FLD_MOD(orig, val, start, end) \ (((orig) & ~FLD_MASK(start, end)) | FLD_VAL(val, start, end)) +#define DSS_AUTOSUSPEND_DELAY 100 /* in ms */ + enum dss_io_pad_mode { DSS_IO_PAD_MODE_RESET, DSS_IO_PAD_MODE_RFBI, diff --git a/drivers/video/omap2/dss/hdmi4.c b/drivers/video/omap2/dss/hdmi4.c index f1a45fe..f255641 100644 --- a/drivers/video/omap2/dss/hdmi4.c +++ b/drivers/video/omap2/dss/hdmi4.c @@ -77,7 +77,8 @@ static void hdmi_runtime_put(void) DSSDBG("hdmi_runtime_put\n"); - r = pm_runtime_put_sync(&hdmi.pdev->dev); + pm_runtime_mark_last_busy(&hdmi.pdev->dev); + r = pm_runtime_put_autosuspend(&hdmi.pdev->dev); WARN_ON(r < 0 && r != -ENOSYS); } @@ -631,6 +632,8 @@ static int omapdss_hdmihw_probe(struct platform_device *pdev) } pm_runtime_enable(&pdev->dev); + pm_runtime_set_autosuspend_delay(&pdev->dev, DSS_AUTOSUSPEND_DELAY); + pm_runtime_use_autosuspend(&pdev->dev); hdmi_init_output(pdev); diff --git a/drivers/video/omap2/dss/rfbi.c b/drivers/video/omap2/dss/rfbi.c index 74d3ed1..20dcbfb 100644 --- a/drivers/video/omap2/dss/rfbi.c +++ b/drivers/video/omap2/dss/rfbi.c @@ -147,7 +147,8 @@ static void rfbi_runtime_put(void) DSSDBG("rfbi_runtime_put\n"); - r = pm_runtime_put_sync(&rfbi.pdev->dev); + pm_runtime_mark_last_busy(&rfbi.pdev->dev); + r = pm_runtime_put_autosuspend(&rfbi.pdev->dev); WARN_ON(r < 0 && r != -ENOSYS); } @@ -981,6 +982,8 @@ static int omap_rfbihw_probe(struct platform_device *pdev) clk_put(clk); pm_runtime_enable(&pdev->dev); + pm_runtime_set_autosuspend_delay(&pdev->dev, DSS_AUTOSUSPEND_DELAY); + pm_runtime_use_autosuspend(&pdev->dev); r = rfbi_runtime_get(); if (r) diff --git a/drivers/video/omap2/dss/venc.c b/drivers/video/omap2/dss/venc.c index e173961..bbd35bb 100644 --- a/drivers/video/omap2/dss/venc.c +++ b/drivers/video/omap2/dss/venc.c @@ -410,7 +410,8 @@ static void venc_runtime_put(void) DSSDBG("venc_runtime_put\n"); - r = pm_runtime_put_sync(&venc.pdev->dev); + pm_runtime_mark_last_busy(&venc.pdev->dev); + r = pm_runtime_put_autosuspend(&venc.pdev->dev); WARN_ON(r < 0 && r != -ENOSYS); } @@ -835,6 +836,8 @@ static int omap_venchw_probe(struct platform_device *pdev) return r; pm_runtime_enable(&pdev->dev); + pm_runtime_set_autosuspend_delay(&pdev->dev, DSS_AUTOSUSPEND_DELAY); + pm_runtime_use_autosuspend(&pdev->dev); r = venc_runtime_get(); if (r)
Use runtime PM's autosuspend support with delay of 100ms. This will prevent the driver from turning the DSS modules off and on multiple times e.g. when loading the module. Signed-off-by: Tomi Valkeinen <tomi.valkeinen@ti.com> --- drivers/video/omap2/dss/dispc.c | 5 ++++- drivers/video/omap2/dss/dsi.c | 5 ++++- drivers/video/omap2/dss/dss.c | 5 ++++- drivers/video/omap2/dss/dss.h | 2 ++ drivers/video/omap2/dss/hdmi4.c | 5 ++++- drivers/video/omap2/dss/rfbi.c | 5 ++++- drivers/video/omap2/dss/venc.c | 5 ++++- 7 files changed, 26 insertions(+), 6 deletions(-)