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

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Message-ID: <CABymUCOsF5gL_i-uEyBBpgV_9qO_T3hNQ6vSX-dMGRsdFfgPXg@mail.gmail.com>
Date: Tue, 3 Sep 2024 15:34:03 +0800
From: Jun Nie <jun.nie@...aro.org>
To: Dmitry Baryshkov <dmitry.baryshkov@...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

Dmitry Baryshkov <dmitry.baryshkov@...aro.org> 于2024年8月29日周四 18:57写道：
>
> 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.

Please forgive me for my bad English. Is below words better?

Data width for DSC timing is aligned with the width that goes to a DSI
interface, not with whole screen width. For bonded-DSI case, the
width for DSC timing is half width of whole screen.
>
> >
> > 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

OK. Will split it.

>
> >
> > @@ -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