[PATCH 1/3] drm/i915: Add meaningful traces for QGV point info error handling

[Govindapillai, Vinod]

Hi Stan

On Tue, 2024-02-20 at 11:31 +0200, Stanislav Lisovskiy wrote:
> For debug purposes we need those - error path won't flood the log,
> however there has been already numerous cases, when due to lack
> of debugs, we couldn't immediately tell what was the problem on
> customer machine, which slowed down the investigation, requiring
> to get access to target device and adding those traces manually.
> 
> v2: - Make the debug more generic and move it to intel_dram_detect
>       (Gustavo Sousa)
> 
> Signed-off-by: Stanislav Lisovskiy <stanislav.lisovskiy at intel.com>
> ---
>  drivers/gpu/drm/i915/display/intel_bw.c | 4 +++-
>  drivers/gpu/drm/i915/soc/intel_dram.c   | 2 ++
>  2 files changed, 5 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/gpu/drm/i915/display/intel_bw.c b/drivers/gpu/drm/i915/display/intel_bw.c
> index 7f2a50b4f494..77886cc21211 100644
> --- a/drivers/gpu/drm/i915/display/intel_bw.c
> +++ b/drivers/gpu/drm/i915/display/intel_bw.c
> @@ -290,8 +290,10 @@ static int icl_get_qgv_points(struct drm_i915_private *dev_priv,
>                 struct intel_qgv_point *sp = &qi->points[i];
>  
>                 ret = intel_read_qgv_point_info(dev_priv, sp, i);
> -               if (ret)
> +               if (ret) {
> +                       drm_dbg_kms(&dev_priv->drm, "Could not read QGV %d info\n", i);
>                         return ret;
> +               }
>  
>                 drm_dbg_kms(&dev_priv->drm,
>                             "QGV %d: DCLK=%d tRP=%d tRDPRE=%d tRAS=%d tRCD=%d tRC=%d\n",
> diff --git a/drivers/gpu/drm/i915/soc/intel_dram.c b/drivers/gpu/drm/i915/soc/intel_dram.c
> index 15492b69f698..e957be5bfb35 100644
> --- a/drivers/gpu/drm/i915/soc/intel_dram.c
> +++ b/drivers/gpu/drm/i915/soc/intel_dram.c
> @@ -681,6 +681,8 @@ void intel_dram_detect(struct drm_i915_private *i915)
>         if (ret)
>                 return;
>  
> +       drm_dbg_kms(&i915->drm, "Num qgv points %d\n", dram_info->num_qgv_points);
> +

There was a suggestion from Gustavo to use %u as num_qgv_points is u8.. in case if you missed it!

Reviewed-by: Vinod Govindapillai <vinod.govindapillai at intel.com>

>         drm_dbg_kms(&i915->drm, "DRAM channels: %u\n", dram_info->num_channels);
>  
>         drm_dbg_kms(&i915->drm, "Watermark level 0 adjustment needed: %s\n",