The DSI link must be powered up to let panel driver to talk to the panel
during prepare() callback execution. Set the prepare_prev_first flag to
guarantee this.

Fixes: 9e15123eca79 ("drm/msm/dsi: Stop unconditionally powering up DSI hosts at modeset")
Signed-off-by: Dmitry Baryshkov <dmitry.baryshkov@oss.qualcomm.com>
---
 drivers/gpu/drm/panel/panel-sharp-ls043t1le01.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/drivers/gpu/drm/panel/panel-sharp-ls043t1le01.c b/drivers/gpu/drm/panel/panel-sharp-ls043t1le01.c
index 36abfa2e65e9..dd1eaba23ad3 100644
--- a/drivers/gpu/drm/panel/panel-sharp-ls043t1le01.c
+++ b/drivers/gpu/drm/panel/panel-sharp-ls043t1le01.c
@@ -201,6 +201,7 @@ static int sharp_nt_panel_add(struct sharp_nt_panel *sharp_nt)
 
 	drm_panel_init(&sharp_nt->base, &sharp_nt->dsi->dev,
 		       &sharp_nt_panel_funcs, DRM_MODE_CONNECTOR_DSI);
+	sharp_nt->base.prepare_prev_first = true;
 
 	ret = drm_panel_of_backlight(&sharp_nt->base);
 	if (ret)

---
base-commit: 8e5a478b6d6a5bb0a3d52147862b15e4d826af19
change-id: 20260323-panel-fix-4e794508de92

Best regards,
-- 
With best wishes
Dmitry

Hi,

On Mon, 23 Mar 2026 03:21:49 +0200, Dmitry Baryshkov wrote:
> The DSI link must be powered up to let panel driver to talk to the panel
> during prepare() callback execution. Set the prepare_prev_first flag to
> guarantee this.
> 
> 

Thanks, Applied to https://gitlab.freedesktop.org/drm/misc/kernel.git (drm-misc-next)

[1/1] drm/panel: sharp-ls043t1le01: make use of prepare_prev_first
      https://gitlab.freedesktop.org/drm/misc/kernel/-/commit/c222177d7c7e1b2e0433d9e47ec2da7015345d50

-- 
Neil

Hi,

On Sun, Mar 22, 2026 at 6:21 PM Dmitry Baryshkov
<dmitry.baryshkov@oss.qualcomm.com> wrote:
>
> The DSI link must be powered up to let panel driver to talk to the panel
> during prepare() callback execution. Set the prepare_prev_first flag to
> guarantee this.
>
> Fixes: 9e15123eca79 ("drm/msm/dsi: Stop unconditionally powering up DSI hosts at modeset")
> Signed-off-by: Dmitry Baryshkov <dmitry.baryshkov@oss.qualcomm.com>
> ---
>  drivers/gpu/drm/panel/panel-sharp-ls043t1le01.c | 1 +
>  1 file changed, 1 insertion(+)

Reviewed-by: Douglas Anderson <dianders@chromium.org>