drm/panel: otm8009a: Set backlight parent to panel device

commit ab4f869fba6119997f7630d600049762a2b014fa upstream.

This is the logical place to put the backlight device, and it also
fixes a kernel crash if the MIPI host is removed. Previously the
backlight device would be unregistered twice when this happened - once
as a child of the MIPI host through `mipi_dsi_host_unregister`, and
once when the panel device is destroyed.

Fixes: 661bbe90a292 ("drm/panel: otm8009a: Use new backlight API")
Signed-off-by: James Cowgill <james.cowgill@blaize.com>
Cc: stable@vger.kernel.org
Reviewed-by: Neil Armstrong <neil.armstrong@linaro.org>
Signed-off-by: Neil Armstrong <neil.armstrong@linaro.org>
Link: https://patchwork.freedesktop.org/patch/msgid/20230412173450.199592-1-james.cowgill@blaize.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/gpu/drm/panel/panel-orisetech-otm8009a.c b/drivers/gpu/drm/panel/panel-orisetech-otm8009a.c
index c7b48df8869a1d6e28a9e174076af0f709525934..3ee265f1755f4af10161eb53f846b4a6320efba3 100644 (file)
--- a/drivers/gpu/drm/panel/panel-orisetech-otm8009a.c
+++ b/drivers/gpu/drm/panel/panel-orisetech-otm8009a.c
@@ -460,7 +460,7 @@ static int otm8009a_probe(struct mipi_dsi_device *dsi)
        ctx->panel.funcs = &otm8009a_drm_funcs;
 
        ctx->bl_dev = devm_backlight_device_register(dev, dev_name(dev),
-                                                    dsi->host->dev, ctx,
+                                                    dev, ctx,
                                                     &otm8009a_backlight_ops,
                                                     NULL);
        if (IS_ERR(ctx->bl_dev)) {