linux-kernel - Re: [PATCH 03/21] drm/msm/dsi: pass the right width to dsc

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <CAA8EJpqCL1xFVB8_2j2QwPsF-vHBcFBt3yx=acpWgmo4_Oudug@mail.gmail.com>
Date: Thu, 29 Aug 2024 13:57:19 +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>, 
	Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>, Maxime Ripard <mripard@...nel.org>, 
	Thomas Zimmermann <tzimmermann@...e.de>, linux-arm-msm@...r.kernel.org, 
	dri-devel@...ts.freedesktop.org, freedreno@...ts.freedesktop.org, 
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 03/21] drm/msm/dsi: pass the right width to dsc

On Thu, 29 Aug 2024 at 13:19, Jun Nie <jun.nie@...aro.org> wrote:
>
> Data width for dsc engine is aligned with pipe, not with whole screen
> width. Because the width may be halved in DSI bonded case.

Can't really parse this.

>
> The dsc width is not related to the timing with back front porch in
> later stage, so update dsc timing earlier.
>
> Signed-off-by: Jun Nie <jun.nie@...aro.org>
> ---
>  drivers/gpu/drm/msm/dsi/dsi_host.c | 13 ++++++-------
>  1 file changed, 6 insertions(+), 7 deletions(-)
>
> diff --git a/drivers/gpu/drm/msm/dsi/dsi_host.c b/drivers/gpu/drm/msm/dsi/dsi_host.c
> index 7a4d9c071be5a..5abade8f26b88 100644
> --- a/drivers/gpu/drm/msm/dsi/dsi_host.c
> +++ b/drivers/gpu/drm/msm/dsi/dsi_host.c
> @@ -953,7 +953,7 @@ static void dsi_timing_setup(struct msm_dsi_host *msm_host, bool is_bonded_dsi)
>                         return;
>                 }
>
> -               dsc->pic_width = mode->hdisplay;
> +               dsc->pic_width = hdisplay;
>                 dsc->pic_height = mode->vdisplay;
>                 DBG("Mode %dx%d\n", dsc->pic_width, dsc->pic_height);

Two separate commits

>
> @@ -964,6 +964,11 @@ static void dsi_timing_setup(struct msm_dsi_host *msm_host, bool is_bonded_dsi)
>                 if (ret)
>                         return;
>
> +               if (msm_host->mode_flags & MIPI_DSI_MODE_VIDEO)
> +                       dsi_update_dsc_timing(msm_host, false, hdisplay);
> +               else
> +                       dsi_update_dsc_timing(msm_host, true, hdisplay);
> +
>                 /*
>                  * DPU sends 3 bytes per pclk cycle to DSI. If widebus is
>                  * enabled, bus width is extended to 6 bytes.
> @@ -990,9 +995,6 @@ static void dsi_timing_setup(struct msm_dsi_host *msm_host, bool is_bonded_dsi)
>         }
>
>         if (msm_host->mode_flags & MIPI_DSI_MODE_VIDEO) {
> -               if (msm_host->dsc)
> -                       dsi_update_dsc_timing(msm_host, false, mode->hdisplay);
> -
>                 dsi_write(msm_host, REG_DSI_ACTIVE_H,
>                         DSI_ACTIVE_H_START(ha_start) |
>                         DSI_ACTIVE_H_END(ha_end));
> @@ -1011,9 +1013,6 @@ static void dsi_timing_setup(struct msm_dsi_host *msm_host, bool is_bonded_dsi)
>                         DSI_ACTIVE_VSYNC_VPOS_START(vs_start) |
>                         DSI_ACTIVE_VSYNC_VPOS_END(vs_end));
>         } else {                /* command mode */
> -               if (msm_host->dsc)
> -                       dsi_update_dsc_timing(msm_host, true, mode->hdisplay);
> -
>                 /* image data and 1 byte write_memory_start cmd */
>                 if (!msm_host->dsc)
>                         wc = hdisplay * mipi_dsi_pixel_format_to_bpp(msm_host->format) / 8 + 1;
>
> --
> 2.34.1
>


-- 
With best wishes
Dmitry