On Fri, 11 May 2018, Dhinakaran Pandiyan <dhinakaran.pandiyan@xxxxxxxxx> wrote:
> Entry corresponding to 220 us setup time was missing. I am not aware of
> any specific bug this fixes, but this could potentially result in enabling
> PSR on a panel with a higher setup time requirement than supported by the
> hardware.
>
> I verified the value is present in eDP spec versions 1.3, 1.4 and 1.4a.
>
> Fixes: 6608804b3d7f ("drm/dp: Add drm_dp_psr_setup_time()")
> Cc: stable@xxxxxxxxxxxxxxx
> Cc: Ville Syrjälä <ville.syrjala@xxxxxxxxxxxxxxx>
> Cc: Jose Roberto de Souza <jose.souza@xxxxxxxxx>
> Cc: dri-devel@xxxxxxxxxxxxxxxxxxxxx
> Signed-off-by: Dhinakaran Pandiyan <dhinakaran.pandiyan@xxxxxxxxx>
Pushed to drm-misc-fixes with reviews picked up from the earlier posting
[1]. Doesn't look like the function is used by anyone other than i915,
so I didn't bother with further acks from non-Intel devs. Should be a
straightforward fix anyway.
BR,
Jani.
[1] http://mid.mail-archive.com/20180511005419.11199-1-dhinakaran.pandiyan@xxxxxxxxx
> ---
> drivers/gpu/drm/drm_dp_helper.c | 1 +
> 1 file changed, 1 insertion(+)
>
> diff --git a/drivers/gpu/drm/drm_dp_helper.c b/drivers/gpu/drm/drm_dp_helper.c
> index 36c7609a4bd5..a7ba602a43a8 100644
> --- a/drivers/gpu/drm/drm_dp_helper.c
> +++ b/drivers/gpu/drm/drm_dp_helper.c
> @@ -1159,6 +1159,7 @@ int drm_dp_psr_setup_time(const u8 psr_cap[EDP_PSR_RECEIVER_CAP_SIZE])
> static const u16 psr_setup_time_us[] = {
> PSR_SETUP_TIME(330),
> PSR_SETUP_TIME(275),
> + PSR_SETUP_TIME(220),
> PSR_SETUP_TIME(165),
> PSR_SETUP_TIME(110),
> PSR_SETUP_TIME(55),
--
Jani Nikula, Intel Open Source Graphics Center
