linux-kernel - Re: [PATCH v3 3/6] drm/msm/dsi: set VIDEO_COMPRESSION_MODE_CTRL

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Date: Wed, 3 Apr 2024 13:13:55 +0300
From: Dmitry Baryshkov <dmitry.baryshkov@...aro.org>
To: Jun Nie <jun.nie@...aro.org>
Cc: Rob Clark <robdclark@...il.com>, Abhinav Kumar <quic_abhinavk@...cinc.com>, 
	Sean Paul <sean@...rly.run>, Marijn Suijten <marijn.suijten@...ainline.org>, 
	David Airlie <airlied@...il.com>, Daniel Vetter <daniel@...ll.ch>, 
	Jessica Zhang <quic_jesszhan@...cinc.com>, Vinod Koul <vkoul@...nel.org>, 
	linux-arm-msm@...r.kernel.org, dri-devel@...ts.freedesktop.org, 
	freedreno@...ts.freedesktop.org, linux-kernel@...r.kernel.org, 
	Jonathan Marek <jonathan@...ek.ca>
Subject: Re: [PATCH v3 3/6] drm/msm/dsi: set VIDEO_COMPRESSION_MODE_CTRL_WC
 (fix video mode DSC)

On Wed, 3 Apr 2024 at 12:11, Jun Nie <jun.nie@...aro.org> wrote:
>
> From: Jonathan Marek <jonathan@...ek.ca>
>
> Video mode DSC won't work if this field is not set correctly. Set it to fix
> video mode DSC (for slice_per_pkt==1 cases at least).
>
> Fixes: 08802f515c3c ("drm/msm/dsi: Add support for DSC configuration")
> Signed-off-by: Jonathan Marek <jonathan@...ek.ca>
> Reviewed-by: Dmitry Baryshkov <dmitry.baryshkov@...aro.org>

You S-o-b is missing

> ---
>  drivers/gpu/drm/msm/dsi/dsi_host.c | 3 +++
>  1 file changed, 3 insertions(+)
>
> diff --git a/drivers/gpu/drm/msm/dsi/dsi_host.c b/drivers/gpu/drm/msm/dsi/dsi_host.c
> index 2a0422cad6de..80ea4f1d8274 100644
> --- a/drivers/gpu/drm/msm/dsi/dsi_host.c
> +++ b/drivers/gpu/drm/msm/dsi/dsi_host.c
> @@ -858,6 +858,7 @@ static void dsi_update_dsc_timing(struct msm_dsi_host *msm_host, bool is_cmd_mod
>         u32 slice_per_intf, total_bytes_per_intf;
>         u32 pkt_per_line;
>         u32 eol_byte_num;
> +       u32 bytes_per_pkt;
>
>         /* first calculate dsc parameters and then program
>          * compress mode registers
> @@ -865,6 +866,7 @@ static void dsi_update_dsc_timing(struct msm_dsi_host *msm_host, bool is_cmd_mod
>         slice_per_intf = msm_dsc_get_slices_per_intf(dsc, hdisplay);
>
>         total_bytes_per_intf = dsc->slice_chunk_size * slice_per_intf;
> +       bytes_per_pkt = dsc->slice_chunk_size; /* * slice_per_pkt; */
>
>         eol_byte_num = total_bytes_per_intf % 3;
>
> @@ -902,6 +904,7 @@ static void dsi_update_dsc_timing(struct msm_dsi_host *msm_host, bool is_cmd_mod
>                 dsi_write(msm_host, REG_DSI_COMMAND_COMPRESSION_MODE_CTRL, reg_ctrl);
>                 dsi_write(msm_host, REG_DSI_COMMAND_COMPRESSION_MODE_CTRL2, reg_ctrl2);
>         } else {
> +               reg |= DSI_VIDEO_COMPRESSION_MODE_CTRL_WC(bytes_per_pkt);
>                 dsi_write(msm_host, REG_DSI_VIDEO_COMPRESSION_MODE_CTRL, reg);
>         }
>  }
>
> --
> 2.34.1
>


-- 
With best wishes
Dmitry