[PATCH] drm/amd/display: Update DCN302 SR Exit Latency

[Pillai, Aurabindo]

[AMD Official Use Only - Internal Distribution Only]

Hi Bindu,

The value is recommended by the hardware team. Since a non-recommended value was being used, that itself is the root cause. I will add this to commit message.

--

Thanks & Regards,
Aurabindo Pillai
________________________________
From: R, Bindu <Bindu.R at amd.com>
Sent: Thursday, April 8, 2021 11:55 AM
To: Pillai, Aurabindo <Aurabindo.Pillai at amd.com>; amd-gfx at lists.freedesktop.org <amd-gfx at lists.freedesktop.org>
Cc: Aberback, Joshua <Joshua.Aberback at amd.com>
Subject: Re: [PATCH] drm/amd/display: Update DCN302 SR Exit Latency


[AMD Official Use Only - Internal Distribution Only]

​Hi Jay,
   Could you please add few details on the root cause, in the [Why/How] section?

Thanks,
Bindu
________________________________
From: Aurabindo Pillai <aurabindo.pillai at amd.com>
Sent: Thursday, April 8, 2021 11:48 AM
To: amd-gfx at lists.freedesktop.org <amd-gfx at lists.freedesktop.org>
Cc: Pillai, Aurabindo <Aurabindo.Pillai at amd.com>; R, Bindu <Bindu.R at amd.com>; Aberback, Joshua <Joshua.Aberback at amd.com>
Subject: [PATCH] drm/amd/display: Update DCN302 SR Exit Latency

From: Joshua Aberback <joshua.aberback at amd.com>

[Why]
Update SR Exit Latency to fix screen flickering caused due to OTG
underflow

Signed-off-by: Joshua Aberback <joshua.aberback at amd.com>
Acked-by: Aurabindo Pillai <aurabindo.pillai at amd.com>
---
 drivers/gpu/drm/amd/display/dc/dcn302/dcn302_resource.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/amd/display/dc/dcn302/dcn302_resource.c b/drivers/gpu/drm/amd/display/dc/dcn302/dcn302_resource.c
index a928c1d9a557..fc2dea243d1b 100644
--- a/drivers/gpu/drm/amd/display/dc/dcn302/dcn302_resource.c
+++ b/drivers/gpu/drm/amd/display/dc/dcn302/dcn302_resource.c
@@ -164,7 +164,7 @@ struct _vcs_dpi_soc_bounding_box_st dcn3_02_soc = {

                 .min_dcfclk = 500.0, /* TODO: set this to actual min DCFCLK */
                 .num_states = 1,
-               .sr_exit_time_us = 12,
+               .sr_exit_time_us = 15.5,
                 .sr_enter_plus_exit_time_us = 20,
                 .urgent_latency_us = 4.0,
                 .urgent_latency_pixel_data_only_us = 4.0,
--
2.31.1

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