| Message ID | 20210728094511.3.I842d483139531aa4651da8338512fdf0171ff23c@changeid (mailing list archive) |
|---|---|
| State | Superseded |
| Headers | show |
| Series | drm/panel: atna33xc20: Fix the Samsung ATNA33XC20 panel | expand |
Hey Doug, Thanks for submitting this. On Wed, 28 Jul 2021 at 18:46, Douglas Anderson <dianders@chromium.org> wrote: > > The manual has always said that we need 100 us delays in a few > places. Though it hasn't seemed to be a big deal to skip these, let's > add them in case it makes something happier. > > NOTE: this fixes no known issues but it seems good to make it right. > > Signed-off-by: Douglas Anderson <dianders@chromium.org> > --- > > 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 5e932070a1c3..cd0fccdd8dfd 100644 > --- a/drivers/gpu/drm/bridge/ti-sn65dsi86.c > +++ b/drivers/gpu/drm/bridge/ti-sn65dsi86.c > @@ -307,6 +307,9 @@ static int __maybe_unused ti_sn65dsi86_resume(struct device *dev) > return ret; > } > > + /* td2: min 100 us after regulators before enabling the GPIO */ > + usleep_range(100, 110); > + > gpiod_set_value(pdata->enable_gpio, 1); > > /* > @@ -1096,6 +1099,9 @@ static void ti_sn_bridge_pre_enable(struct drm_bridge *bridge) > > if (!pdata->refclk) > ti_sn65dsi86_enable_comms(pdata); > + > + /* td7: min 100 us after enable before DSI data */ > + usleep_range(100, 110); > } > > static void ti_sn_bridge_post_disable(struct drm_bridge *bridge) > -- > 2.32.0.432.gabb21c7263-goog > Acked-by: Robert Foss <robert.foss@linaro.org>
diff --git a/drivers/gpu/drm/bridge/ti-sn65dsi86.c b/drivers/gpu/drm/bridge/ti-sn65dsi86.c index 5e932070a1c3..cd0fccdd8dfd 100644 --- a/drivers/gpu/drm/bridge/ti-sn65dsi86.c +++ b/drivers/gpu/drm/bridge/ti-sn65dsi86.c @@ -307,6 +307,9 @@ static int __maybe_unused ti_sn65dsi86_resume(struct device *dev) return ret; } + /* td2: min 100 us after regulators before enabling the GPIO */ + usleep_range(100, 110); + gpiod_set_value(pdata->enable_gpio, 1); /* @@ -1096,6 +1099,9 @@ static void ti_sn_bridge_pre_enable(struct drm_bridge *bridge) if (!pdata->refclk) ti_sn65dsi86_enable_comms(pdata); + + /* td7: min 100 us after enable before DSI data */ + usleep_range(100, 110); } static void ti_sn_bridge_post_disable(struct drm_bridge *bridge)
The manual has always said that we need 100 us delays in a few places. Though it hasn't seemed to be a big deal to skip these, let's add them in case it makes something happier. NOTE: this fixes no known issues but it seems good to make it right. Signed-off-by: Douglas Anderson <dianders@chromium.org> --- drivers/gpu/drm/bridge/ti-sn65dsi86.c | 6 ++++++ 1 file changed, 6 insertions(+)