[PATCH] drm/amd/powerplay/smu7: enforce minimal VBITimeout (v2)

[Quan, Evan]

Reviewed-by: Evan Quan <evan.quan at amd.com>

> -----Original Message-----
> From: amd-gfx <amd-gfx-bounces at lists.freedesktop.org> On Behalf Of Alex
> Deucher
> Sent: Thursday, August 15, 2019 4:42 AM
> To: amd-gfx at lists.freedesktop.org
> Cc: Deucher, Alexander <Alexander.Deucher at amd.com>; Ahzo
> <Ahzo at tutanota.com>
> Subject: [PATCH] drm/amd/powerplay/smu7: enforce minimal VBITimeout
> (v2)
> 
> From: Ahzo <Ahzo at tutanota.com>
> 
> This fixes screen corruption/flickering on 75 Hz displays.
> 
> v2: make print statement debug only (Alex)
> 
> Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=102646
> Signed-off-by: Ahzo <Ahzo at tutanota.com>
> Signed-off-by: Alex Deucher <alexander.deucher at amd.com>
> ---
>  drivers/gpu/drm/amd/powerplay/hwmgr/smu7_hwmgr.c | 5 +++++
>  1 file changed, 5 insertions(+)
> 
> diff --git a/drivers/gpu/drm/amd/powerplay/hwmgr/smu7_hwmgr.c
> b/drivers/gpu/drm/amd/powerplay/hwmgr/smu7_hwmgr.c
> index 10d66e3c7a9f..b468f634ffa1 100644
> --- a/drivers/gpu/drm/amd/powerplay/hwmgr/smu7_hwmgr.c
> +++ b/drivers/gpu/drm/amd/powerplay/hwmgr/smu7_hwmgr.c
> @@ -4067,6 +4067,11 @@ static int smu7_program_display_gap(struct
> pp_hwmgr *hwmgr)
> 
>  	data->frame_time_x2 = frame_time_in_us * 2 / 100;
> 
> +	if (data->frame_time_x2 < 280) {
> +		pr_debug("%s: enforce minimal VBITimeout: %d -> 280\n",
> __func__, data->frame_time_x2);
> +		data->frame_time_x2 = 280;
> +	}
> +
>  	display_gap2 = pre_vbi_time_in_us * (ref_clock / 100);
> 
>  	cgs_write_ind_register(hwmgr->device, CGS_IND_REG__SMC,
> ixCG_DISPLAY_GAP_CNTL2, display_gap2);
> --
> 2.20.1
> 
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