linux-kernel - Re: [PATCH 1/4] drm/hisilicon: Enforce 128-byte stride alignment to fix the hardware limitation

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Date:   Fri, 3 Apr 2020 10:00:18 +0800
From:   Xinliang Liu <xinliang.liu@...aro.org>
To:     Tian Tao <tiantao6@...ilicon.com>
Cc:     Chen Feng <puck.chen@...ilicon.com>,
        David Airlie <airlied@...ux.ie>,
        Daniel Vetter <daniel@...ll.ch>, tzimmermann@...e.de,
        kraxel@...hat.com, alexander.deucher@....com, tglx@...utronix.de,
        dri-devel <dri-devel@...ts.freedesktop.org>,
        lkml <linux-kernel@...r.kernel.org>, linuxarm@...wei.com
Subject: Re: [PATCH 1/4] drm/hisilicon: Enforce 128-byte stride alignment to
 fix the hardware limitation

Hi Tao,

On Fri, 6 Mar 2020 at 11:44, Tian Tao <tiantao6@...ilicon.com> wrote:
>
> because the hardware limitation,The initial color depth must set to 32bpp
> and must set the FB Offset of the display hardware to 128Byte alignment,
> which is used to solve the display problem at 800x600 and 1440x900
> resolution under 16bpp.
>
> Signed-off-by: Tian Tao <tiantao6@...ilicon.com>
> Signed-off-by: Gong junjie <gongjunjie2@...wei.com>

Thanks for the patch.
Acked-by: Xinliang Liu <xinliang.liu@...aro.org>
Applied to drm-misc.

-Xinliang

> ---
>  drivers/gpu/drm/hisilicon/hibmc/hibmc_drm_de.c  | 9 +++++----
>  drivers/gpu/drm/hisilicon/hibmc/hibmc_drm_drv.c | 4 ++--
>  drivers/gpu/drm/hisilicon/hibmc/hibmc_ttm.c     | 2 +-
>  3 files changed, 8 insertions(+), 7 deletions(-)
>
> diff --git a/drivers/gpu/drm/hisilicon/hibmc/hibmc_drm_de.c b/drivers/gpu/drm/hisilicon/hibmc/hibmc_drm_de.c
> index 55b46a7..cc70e83 100644
> --- a/drivers/gpu/drm/hisilicon/hibmc/hibmc_drm_de.c
> +++ b/drivers/gpu/drm/hisilicon/hibmc/hibmc_drm_de.c
> @@ -94,6 +94,10 @@ static int hibmc_plane_atomic_check(struct drm_plane *plane,
>                 return -EINVAL;
>         }
>
> +       if (state->fb->pitches[0] % 128 != 0) {
> +               DRM_DEBUG_ATOMIC("wrong stride with 128-byte aligned\n");
> +               return -EINVAL;
> +       }
>         return 0;
>  }
>
> @@ -119,11 +123,8 @@ static void hibmc_plane_atomic_update(struct drm_plane *plane,
>         writel(gpu_addr, priv->mmio + HIBMC_CRT_FB_ADDRESS);
>
>         reg = state->fb->width * (state->fb->format->cpp[0]);
> -       /* now line_pad is 16 */
> -       reg = PADDING(16, reg);
>
> -       line_l = state->fb->width * state->fb->format->cpp[0];
> -       line_l = PADDING(16, line_l);
> +       line_l = state->fb->pitches[0];
>         writel(HIBMC_FIELD(HIBMC_CRT_FB_WIDTH_WIDTH, reg) |
>                HIBMC_FIELD(HIBMC_CRT_FB_WIDTH_OFFS, line_l),
>                priv->mmio + HIBMC_CRT_FB_WIDTH);
> diff --git a/drivers/gpu/drm/hisilicon/hibmc/hibmc_drm_drv.c b/drivers/gpu/drm/hisilicon/hibmc/hibmc_drm_drv.c
> index 222356a..79a180a 100644
> --- a/drivers/gpu/drm/hisilicon/hibmc/hibmc_drm_drv.c
> +++ b/drivers/gpu/drm/hisilicon/hibmc/hibmc_drm_drv.c
> @@ -94,7 +94,7 @@ static int hibmc_kms_init(struct hibmc_drm_private *priv)
>         priv->dev->mode_config.max_height = 1200;
>
>         priv->dev->mode_config.fb_base = priv->fb_base;
> -       priv->dev->mode_config.preferred_depth = 24;
> +       priv->dev->mode_config.preferred_depth = 32;
>         priv->dev->mode_config.prefer_shadow = 1;
>
>         priv->dev->mode_config.funcs = (void *)&hibmc_mode_funcs;
> @@ -307,7 +307,7 @@ static int hibmc_load(struct drm_device *dev)
>         /* reset all the states of crtc/plane/encoder/connector */
>         drm_mode_config_reset(dev);
>
> -       ret = drm_fbdev_generic_setup(dev, 16);
> +       ret = drm_fbdev_generic_setup(dev, dev->mode_config.preferred_depth);
>         if (ret) {
>                 DRM_ERROR("failed to initialize fbdev: %d\n", ret);
>                 goto err;
> diff --git a/drivers/gpu/drm/hisilicon/hibmc/hibmc_ttm.c b/drivers/gpu/drm/hisilicon/hibmc/hibmc_ttm.c
> index 99397ac..322bd54 100644
> --- a/drivers/gpu/drm/hisilicon/hibmc/hibmc_ttm.c
> +++ b/drivers/gpu/drm/hisilicon/hibmc/hibmc_ttm.c
> @@ -50,7 +50,7 @@ void hibmc_mm_fini(struct hibmc_drm_private *hibmc)
>  int hibmc_dumb_create(struct drm_file *file, struct drm_device *dev,
>                       struct drm_mode_create_dumb *args)
>  {
> -       return drm_gem_vram_fill_create_dumb(file, dev, 0, 16, args);
> +       return drm_gem_vram_fill_create_dumb(file, dev, 0, 128, args);
>  }
>
>  const struct drm_mode_config_funcs hibmc_mode_funcs = {
> --
> 2.7.4
>