On Thu, Mar 16, 2017 at 02:40:21PM +0100, Andrzej Hajda wrote:
> On 10.03.2017 05:32, Sean Paul wrote:
> > From: zain wang <wzz@xxxxxxxxxxxxxx>
> >
> > There is a race between AUX CH bring-up and enabling bridge which will
> > cause link training to fail. To avoid hitting it, don't change psr state
> > while enabling the bridge.
> >
> > Cc: Tomeu Vizoso <tomeu.vizoso@xxxxxxxxxxxxx>
> > Cc: Sean Paul <seanpaul@xxxxxxxxxxxx>
> > Signed-off-by: zain wang <wzz@xxxxxxxxxxxxxx>
> > Signed-off-by: Caesar Wang <wxt@xxxxxxxxxxxxxx>
> > [seanpaul fixed up the commit message a bit and renamed *_supported to *_enabled]
> > Signed-off-by: Sean Paul <seanpaul@xxxxxxxxxxxx>
>
> Hmm, beside resetting psr_enable in analogix_dp_bridge_disable I do not
> see functional change, or am I blind?
The patch also adds a check of psr_enable in analogix_dp_commit. This will avoid
trying to enable psr when the bridge is disabled (that's why psr_enable is
reset).
Sean
>
> Regards
> Andrzej
>
> > ---
> > drivers/gpu/drm/bridge/analogix/analogix_dp_core.c | 15 ++++++++-------
> > drivers/gpu/drm/bridge/analogix/analogix_dp_core.h | 2 +-
> > drivers/gpu/drm/rockchip/analogix_dp-rockchip.c | 2 +-
> > include/drm/bridge/analogix_dp.h | 2 +-
> > 4 files changed, 11 insertions(+), 10 deletions(-)
> >
> > diff --git a/drivers/gpu/drm/bridge/analogix/analogix_dp_core.c b/drivers/gpu/drm/bridge/analogix/analogix_dp_core.c
> > index 8a8f05fe9da3..64d94a34874d 100644
> > --- a/drivers/gpu/drm/bridge/analogix/analogix_dp_core.c
> > +++ b/drivers/gpu/drm/bridge/analogix/analogix_dp_core.c
> > @@ -98,20 +98,20 @@ static int analogix_dp_detect_hpd(struct analogix_dp_device *dp)
> > return 0;
> > }
> >
> > -int analogix_dp_psr_supported(struct device *dev)
> > +int analogix_dp_psr_enabled(struct device *dev)
> > {
> > struct analogix_dp_device *dp = dev_get_drvdata(dev);
> >
> > - return dp->psr_support;
> > + return dp->psr_enable;
> > }
> > -EXPORT_SYMBOL_GPL(analogix_dp_psr_supported);
> > +EXPORT_SYMBOL_GPL(analogix_dp_psr_enabled);
> >
> > int analogix_dp_enable_psr(struct device *dev)
> > {
> > struct analogix_dp_device *dp = dev_get_drvdata(dev);
> > struct edp_vsc_psr psr_vsc;
> >
> > - if (!dp->psr_support)
> > + if (!dp->psr_enable)
> > return 0;
> >
> > /* Prepare VSC packet as per EDP 1.4 spec, Table 6.9 */
> > @@ -134,7 +134,7 @@ int analogix_dp_disable_psr(struct device *dev)
> > struct edp_vsc_psr psr_vsc;
> > int ret;
> >
> > - if (!dp->psr_support)
> > + if (!dp->psr_enable)
> > return 0;
> >
> > /* Prepare VSC packet as per EDP 1.4 spec, Table 6.9 */
> > @@ -878,8 +878,8 @@ static void analogix_dp_commit(struct analogix_dp_device *dp)
> > /* Enable video */
> > analogix_dp_start_video(dp);
> >
> > - dp->psr_support = analogix_dp_detect_sink_psr(dp);
> > - if (dp->psr_support)
> > + dp->psr_enable = analogix_dp_detect_sink_psr(dp);
> > + if (dp->psr_enable)
> > analogix_dp_enable_sink_psr(dp);
> > }
> >
> > @@ -1120,6 +1120,7 @@ static void analogix_dp_bridge_disable(struct drm_bridge *bridge)
> > if (ret)
> > DRM_ERROR("failed to setup the panel ret = %d\n", ret);
> >
> > + dp->psr_enable = false;
> > dp->dpms_mode = DRM_MODE_DPMS_OFF;
> > }
> >
> > diff --git a/drivers/gpu/drm/bridge/analogix/analogix_dp_core.h b/drivers/gpu/drm/bridge/analogix/analogix_dp_core.h
> > index b039b28d8fcc..e135a42cb19e 100644
> > --- a/drivers/gpu/drm/bridge/analogix/analogix_dp_core.h
> > +++ b/drivers/gpu/drm/bridge/analogix/analogix_dp_core.h
> > @@ -170,7 +170,7 @@ struct analogix_dp_device {
> > int dpms_mode;
> > int hpd_gpio;
> > bool force_hpd;
> > - bool psr_support;
> > + bool psr_enable;
> >
> > struct mutex panel_lock;
> > bool panel_is_modeset;
> > diff --git a/drivers/gpu/drm/rockchip/analogix_dp-rockchip.c b/drivers/gpu/drm/rockchip/analogix_dp-rockchip.c
> > index 64e7e2c0bc58..f44756029478 100644
> > --- a/drivers/gpu/drm/rockchip/analogix_dp-rockchip.c
> > +++ b/drivers/gpu/drm/rockchip/analogix_dp-rockchip.c
> > @@ -83,7 +83,7 @@ static void analogix_dp_psr_set(struct drm_encoder *encoder, bool enabled)
> > int vact_end;
> > int ret;
> >
> > - if (!analogix_dp_psr_supported(dp->dev))
> > + if (!analogix_dp_psr_enabled(dp->dev))
> > return;
> >
> > dev_dbg(dp->dev, "%s PSR...\n", enabled ? "enable" : "disable");
> > diff --git a/include/drm/bridge/analogix_dp.h b/include/drm/bridge/analogix_dp.h
> > index c99d6eaef1ac..4fc0165ed3f5 100644
> > --- a/include/drm/bridge/analogix_dp.h
> > +++ b/include/drm/bridge/analogix_dp.h
> > @@ -38,7 +38,7 @@ struct analogix_dp_plat_data {
> > struct drm_connector *);
> > };
> >
> > -int analogix_dp_psr_supported(struct device *dev);
> > +int analogix_dp_psr_enabled(struct device *dev);
> > int analogix_dp_enable_psr(struct device *dev);
> > int analogix_dp_disable_psr(struct device *dev);
> >
>
--
Sean Paul, Software Engineer, Google / Chromium OS
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