[PATCH] drm/mediatek: dsi: Add atomic {destroy, duplicate}_state, reset callbacks

[Chen-Yu Tsai]

On Fri, Jul 22, 2022 at 1:27 AM AngeloGioacchino Del Regno
<angelogioacchino.delregno at collabora.com> wrote:
>
> Add callbacks for atomic_destroy_state, atomic_duplicate_state and
> atomic_reset to restore functionality of the DSI driver: this solves
> vblank timeouts when another bridge is present in the chain.
>
> Tested bridge chain: DSI <=> ANX7625 => aux-bus panel
>
> Fixes: 7f6335c6a258 ("drm/mediatek: Modify dsi funcs to atomic operations")
> Signed-off-by: AngeloGioacchino Del Regno <angelogioacchino.delregno at collabora.com>

This patch is now needed on top of v6.0-rc1, otherwise booting will
stall for a while waiting for display vblank, which never happens
because the DSI pipeline is not configured correctly.

ChenYu

> ---
>
> Note: The commit that has been mentioned in the Fixes tag should
>       *not* have my Reviewed-by tag, as the author changed it but
>       erroneously retained the tag that I had released for an
>       earlier version of that commit (which was fine, but the new
>       version broke mtk_dsi!).
>
>  drivers/gpu/drm/mediatek/mtk_dsi.c | 3 +++
>  1 file changed, 3 insertions(+)
>
> diff --git a/drivers/gpu/drm/mediatek/mtk_dsi.c b/drivers/gpu/drm/mediatek/mtk_dsi.c
> index 9cc406e1eee1..5b624e0f5b0a 100644
> --- a/drivers/gpu/drm/mediatek/mtk_dsi.c
> +++ b/drivers/gpu/drm/mediatek/mtk_dsi.c
> @@ -808,10 +808,13 @@ static void mtk_dsi_bridge_atomic_post_disable(struct drm_bridge *bridge,
>
>  static const struct drm_bridge_funcs mtk_dsi_bridge_funcs = {
>         .attach = mtk_dsi_bridge_attach,
> +       .atomic_destroy_state = drm_atomic_helper_bridge_destroy_state,
>         .atomic_disable = mtk_dsi_bridge_atomic_disable,
> +       .atomic_duplicate_state = drm_atomic_helper_bridge_duplicate_state,
>         .atomic_enable = mtk_dsi_bridge_atomic_enable,
>         .atomic_pre_enable = mtk_dsi_bridge_atomic_pre_enable,
>         .atomic_post_disable = mtk_dsi_bridge_atomic_post_disable,
> +       .atomic_reset = drm_atomic_helper_bridge_reset,
>         .mode_set = mtk_dsi_bridge_mode_set,
>  };
>
> --
> 2.35.1
>