linux-kernel - Re: [PATCH] drm/msm: fix the highest_bank

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Message-ID: <CAF6AEGvMRa4-33QZ2j7DE42exnmbh=XtyTiNsxMY4HVW4T5kVg@mail.gmail.com>
Date: Mon, 12 Aug 2024 11:12:11 -0700
From: Rob Clark <robdclark@...il.com>
To: Abhinav Kumar <quic_abhinavk@...cinc.com>
Cc: freedreno@...ts.freedesktop.org, 
	Dmitry Baryshkov <dmitry.baryshkov@...aro.org>, Sean Paul <sean@...rly.run>, 
	Marijn Suijten <marijn.suijten@...ainline.org>, David Airlie <airlied@...il.com>, 
	Daniel Vetter <daniel@...ll.ch>, dri-devel@...ts.freedesktop.org, 
	quic_jesszhan@...cinc.com, swboyd@...omium.org, dianders@...omium.org, 
	linux-arm-msm@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] drm/msm: fix the highest_bank_bit for sc7180

On Thu, Aug 8, 2024 at 4:52 PM Abhinav Kumar <quic_abhinavk@...cinc.com> wrote:
>
> sc7180 programs the ubwc settings as 0x1e as that would mean a
> highest bank bit of 14 which matches what the GPU sets as well.
>
> However, the highest_bank_bit field of the msm_mdss_data which is
> being used to program the SSPP's fetch configuration is programmed
> to a highest bank bit of 16 as 0x3 translates to 16 and not 14.
>
> Fix the highest bank bit field used for the SSPP to match the mdss
> and gpu settings.
>
> Fixes: 6f410b246209 ("drm/msm/mdss: populate missing data")
> Signed-off-by: Abhinav Kumar <quic_abhinavk@...cinc.com>

Reviewed-by: Rob Clark <robdclark@...il.com>

> ---
>  drivers/gpu/drm/msm/msm_mdss.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/drivers/gpu/drm/msm/msm_mdss.c b/drivers/gpu/drm/msm/msm_mdss.c
> index d90b9471ba6f..faa88fd6eb4d 100644
> --- a/drivers/gpu/drm/msm/msm_mdss.c
> +++ b/drivers/gpu/drm/msm/msm_mdss.c
> @@ -577,7 +577,7 @@ static const struct msm_mdss_data sc7180_data = {
>         .ubwc_enc_version = UBWC_2_0,
>         .ubwc_dec_version = UBWC_2_0,
>         .ubwc_static = 0x1e,
> -       .highest_bank_bit = 0x3,
> +       .highest_bank_bit = 0x1,
>         .reg_bus_bw = 76800,
>  };
>
> --
> 2.44.0
>