[PATCH 1/1][SRU][H/I/OEM-5.13] drm/i915/display: Disable PSR2 if TGL Display stepping is B1 from A0

[Chris Chiu]

On Mon, Jul 19, 2021 at 9:43 PM <chris.chiu at canonical.com> wrote:

> From: Gwan-gyeong Mun <gwan-gyeong.mun at intel.com>
>
> BugLink: https://bugs.launchpad.net/bugs/1926579
>
> TGL PSR2 hardware tracking shows momentary flicker and screen shift if
> TGL Display stepping is B1 from A0.
> It has been fixed from TGL Display stepping C0.
>
> HSDES: 18015970021
> HSDES: 2209313811
> BSpec: 55378
>
> v2: Add checking of PSR2 manual tracking (Jose)
>
> Cc: José Roberto de Souza <jose.souza at intel.com>
> Signed-off-by: Gwan-gyeong Mun <gwan-gyeong.mun at intel.com>
> Reviewed-by: José Roberto de Souza <jose.souza at intel.com>
> Signed-off-by: José Roberto de Souza <jose.souza at intel.com>
> Link:
> https://patchwork.freedesktop.org/patch/msgid/20210422160544.2427123-1-gwan-gyeong.mun@intel.com
> (cherry picked from commit 8804325861be242a420d68c0175127a5947ac35a)
> Signed-off-by: Chris Chiu <chris.chiu at canonical.com>
> ---
>  drivers/gpu/drm/i915/display/intel_psr.c | 7 +++++++
>  1 file changed, 7 insertions(+)
>
> diff --git a/drivers/gpu/drm/i915/display/intel_psr.c
> b/drivers/gpu/drm/i915/display/intel_psr.c
> index 8ada4f829cab..056dcc2ec4ce 100644
> --- a/drivers/gpu/drm/i915/display/intel_psr.c
> +++ b/drivers/gpu/drm/i915/display/intel_psr.c
> @@ -804,6 +804,13 @@ static bool intel_psr2_config_valid(struct intel_dp
> *intel_dp,
>                 }
>         }
>
> +       /* Wa_2209313811 */
> +       if (!crtc_state->enable_psr2_sel_fetch &&
> +           IS_TGL_DISPLAY_STEP(dev_priv, STEP_A0, STEP_B1)) {
> +               drm_dbg_kms(&dev_priv->drm, "PSR2 HW tracking is not
> supported this Display stepping\n");
> +               return false;
> +       }
> +
>         if (!crtc_state->enable_psr2_sel_fetch &&
>             (crtc_hdisplay > psr_max_h || crtc_vdisplay > psr_max_v)) {
>                 drm_dbg_kms(&dev_priv->drm,
> --
> 2.25.1
>
>
> --
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Fail to compile on Hirsute and Impish due to undefined macros. Need v2 to
fix
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