[PATCH v4 RESEND 1/5] drm/dp_helper: Increase retry interval to 1000us
On Mon, Mar 28, 2016 at 10:33:22AM -0400, Lyude wrote: > This is part of a patch series to migrate all of the workarounds for > commonly seen behavior from bad sinks in intel_dp_dpcd_read_wake() to > drm's DP helper. > > Signed-off-by: Lyude > --- > drivers/gpu/drm/drm_dp_helper.c | 2 +- > 1 file changed, 1 insertion(+), 1 deletion(-) > > diff --git a/drivers/gpu/drm/drm_dp_helper.c b/drivers/gpu/drm/drm_dp_helper.c > index 7d58f59..d1128fb 100644 > --- a/drivers/gpu/drm/drm_dp_helper.c > +++ b/drivers/gpu/drm/drm_dp_helper.c > @@ -160,7 +160,7 @@ int drm_dp_bw_code_to_link_rate(u8 link_bw) > } > EXPORT_SYMBOL(drm_dp_bw_code_to_link_rate); > > -#define AUX_RETRY_INTERVAL 500 /* us */ > +#define AUX_RETRY_INTERVAL 1000 /* us */ Was this to adapt to the msleep(1) in the i915 function? If so it's kinda wrong anyway, since an msleep(1) actually sleeps 1 jiffy, and on most systems that's a lot more than 1 ms. If it all still works, I'd just drop this patch here. I suspect that the magic is all in the more aggressive retrying and the throwaway read, not in how long we actually wait. On patches 2-5: Reviewed-by: Daniel Vetter > > /** > * DOC: dp helpers > -- > 2.5.5 > > ___ > dri-devel mailing list > dri-devel at lists.freedesktop.org > https://lists.freedesktop.org/mailman/listinfo/dri-devel -- Daniel Vetter Software Engineer, Intel Corporation http://blog.ffwll.ch
[PATCH v4 RESEND 1/5] drm/dp_helper: Increase retry interval to 1000us
Yep, the rest of the patchset works fine without this patch On Tue, 2016-03-29 at 10:27 +0200, Daniel Vetter wrote: > On Mon, Mar 28, 2016 at 10:33:22AM -0400, Lyude wrote: > > > > This is part of a patch series to migrate all of the workarounds for > > commonly seen behavior from bad sinks in intel_dp_dpcd_read_wake() to > > drm's DP helper. > > > > Signed-off-by: Lyude > > --- > > Â drivers/gpu/drm/drm_dp_helper.c | 2 +- > > Â 1 file changed, 1 insertion(+), 1 deletion(-) > > > > diff --git a/drivers/gpu/drm/drm_dp_helper.c > > b/drivers/gpu/drm/drm_dp_helper.c > > index 7d58f59..d1128fb 100644 > > --- a/drivers/gpu/drm/drm_dp_helper.c > > +++ b/drivers/gpu/drm/drm_dp_helper.c > > @@ -160,7 +160,7 @@ int drm_dp_bw_code_to_link_rate(u8 link_bw) > > Â } > > Â EXPORT_SYMBOL(drm_dp_bw_code_to_link_rate); > > Â > > -#define AUX_RETRY_INTERVAL 500 /* us */ > > +#define AUX_RETRY_INTERVAL 1000 /* us */ > Was this to adapt to the msleep(1) in the i915 function? If so it's kinda > wrong anyway, since an msleep(1) actually sleeps 1 jiffy, and on most > systems that's a lot more than 1 ms. If it all still works, I'd just drop > this patch here. I suspect that the magic is all in the more aggressive > retrying and the throwaway read, not in how long we actually wait. > > On patches 2-5: Reviewed-by: Daniel Vetter > > > > > Â > > Â /** > > Â * DOC: dp helpers > > --Â > > 2.5.5 > > > > ___ > > dri-devel mailing list > > dri-devel at lists.freedesktop.org > > https://lists.freedesktop.org/mailman/listinfo/dri-devel -- Cheers, Lyude
[PATCH v4 RESEND 1/5] drm/dp_helper: Increase retry interval to 1000us
This is part of a patch series to migrate all of the workarounds for commonly seen behavior from bad sinks in intel_dp_dpcd_read_wake() to drm's DP helper. Signed-off-by: Lyude --- drivers/gpu/drm/drm_dp_helper.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/drivers/gpu/drm/drm_dp_helper.c b/drivers/gpu/drm/drm_dp_helper.c index 7d58f59..d1128fb 100644 --- a/drivers/gpu/drm/drm_dp_helper.c +++ b/drivers/gpu/drm/drm_dp_helper.c @@ -160,7 +160,7 @@ int drm_dp_bw_code_to_link_rate(u8 link_bw) } EXPORT_SYMBOL(drm_dp_bw_code_to_link_rate); -#define AUX_RETRY_INTERVAL 500 /* us */ +#define AUX_RETRY_INTERVAL 1000 /* us */ /** * DOC: dp helpers -- 2.5.5
