When preparing the panel, it seems that it always expects commands to be
transferred in LP mode. However, the disable function removes the
MIPI_DSI_MODE_LPM flag, and no other function re-adds it.

As the unprepare function contains no DSI commands, re-adding the flag
just after disabling the panel should be safe. Add the code re-adding
the flag after the two commands for disabling the panel are sent.

This fixes error messages shown in kernel log when unblanking on
mt8183-kukui-kodama-sku32 device.

Cc: stable@vger.kernel.org
Fixes: a869b9db7adf ("drm/panel: support for boe tv101wum-nl6 wuxga dsi video mode panel")
Signed-off-by: Icenowy Zheng <zhengxingda@iscas.ac.cn>
---
 drivers/gpu/drm/panel/panel-boe-tv101wum-nl6.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/drivers/gpu/drm/panel/panel-boe-tv101wum-nl6.c b/drivers/gpu/drm/panel/panel-boe-tv101wum-nl6.c
index d5fe105bdbdde..658ce64c71eb2 100644
--- a/drivers/gpu/drm/panel/panel-boe-tv101wum-nl6.c
+++ b/drivers/gpu/drm/panel/panel-boe-tv101wum-nl6.c
@@ -1324,6 +1324,8 @@ static int boe_panel_disable(struct drm_panel *panel)
 	mipi_dsi_dcs_set_display_off_multi(&ctx);
 	mipi_dsi_dcs_enter_sleep_mode_multi(&ctx);
 
+	boe->dsi->mode_flags |= MIPI_DSI_MODE_LPM;
+
 	mipi_dsi_msleep(&ctx, 150);
 
 	return ctx.accum_err;
-- 
2.52.0

Hi,

On Sun, 03 May 2026 17:17:08 +0800, Icenowy Zheng wrote:
> When preparing the panel, it seems that it always expects commands to be
> transferred in LP mode. However, the disable function removes the
> MIPI_DSI_MODE_LPM flag, and no other function re-adds it.
> 
> As the unprepare function contains no DSI commands, re-adding the flag
> just after disabling the panel should be safe. Add the code re-adding
> the flag after the two commands for disabling the panel are sent.
> 
> [...]

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

[1/1] drm/panel: boe-tv101wum-nl6: restore MODE_LPM after sending disable cmds
      https://gitlab.freedesktop.org/drm/misc/kernel/-/commit/570cf799e87ae805eacfab3b4ba66676b5fccdb6

-- 
Neil

Hi,

On Sun, May 3, 2026 at 2:17 AM Icenowy Zheng <zhengxingda@iscas.ac.cn> wrote:
>
> When preparing the panel, it seems that it always expects commands to be
> transferred in LP mode. However, the disable function removes the
> MIPI_DSI_MODE_LPM flag, and no other function re-adds it.
>
> As the unprepare function contains no DSI commands, re-adding the flag
> just after disabling the panel should be safe. Add the code re-adding
> the flag after the two commands for disabling the panel are sent.
>
> This fixes error messages shown in kernel log when unblanking on
> mt8183-kukui-kodama-sku32 device.
>
> Cc: stable@vger.kernel.org
> Fixes: a869b9db7adf ("drm/panel: support for boe tv101wum-nl6 wuxga dsi video mode panel")
> Signed-off-by: Icenowy Zheng <zhengxingda@iscas.ac.cn>
> ---
>  drivers/gpu/drm/panel/panel-boe-tv101wum-nl6.c | 2 ++
>  1 file changed, 2 insertions(+)

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

On 5/3/26 11:17, Icenowy Zheng wrote:
> When preparing the panel, it seems that it always expects commands to be
> transferred in LP mode. However, the disable function removes the
> MIPI_DSI_MODE_LPM flag, and no other function re-adds it.
> 
> As the unprepare function contains no DSI commands, re-adding the flag
> just after disabling the panel should be safe. Add the code re-adding
> the flag after the two commands for disabling the panel are sent.
> 
> This fixes error messages shown in kernel log when unblanking on
> mt8183-kukui-kodama-sku32 device.
> 
> Cc: stable@vger.kernel.org
> Fixes: a869b9db7adf ("drm/panel: support for boe tv101wum-nl6 wuxga dsi video mode panel")
> Signed-off-by: Icenowy Zheng <zhengxingda@iscas.ac.cn>
> ---
>   drivers/gpu/drm/panel/panel-boe-tv101wum-nl6.c | 2 ++
>   1 file changed, 2 insertions(+)
> 
> diff --git a/drivers/gpu/drm/panel/panel-boe-tv101wum-nl6.c b/drivers/gpu/drm/panel/panel-boe-tv101wum-nl6.c
> index d5fe105bdbdde..658ce64c71eb2 100644
> --- a/drivers/gpu/drm/panel/panel-boe-tv101wum-nl6.c
> +++ b/drivers/gpu/drm/panel/panel-boe-tv101wum-nl6.c
> @@ -1324,6 +1324,8 @@ static int boe_panel_disable(struct drm_panel *panel)
>   	mipi_dsi_dcs_set_display_off_multi(&ctx);
>   	mipi_dsi_dcs_enter_sleep_mode_multi(&ctx);
>   
> +	boe->dsi->mode_flags |= MIPI_DSI_MODE_LPM;
> +
>   	mipi_dsi_msleep(&ctx, 150);
>   
>   	return ctx.accum_err;

Reviewed-by: Neil Armstrong <neil.armstrong@linaro.org>

Thanks,
Neil