Hi Sam,
Thank you for the patch.
On Mon, Dec 02, 2019 at 08:32:07PM +0100, Sam Ravnborg wrote:
> Use drm_panel infrastructure for backlight.
> Replace direct calls with drm_panel_*() calls
> to utilize the drm_panel support.
>
> Signed-off-by: Sam Ravnborg <sam@xxxxxxxxxxxx>
> cc: Laurent Pinchart <laurent.pinchart@xxxxxxxxxxxxxxxx>
> Cc: Thierry Reding <thierry.reding@xxxxxxxxx>
> Cc: Sam Ravnborg <sam@xxxxxxxxxxxx>
> ---
> drivers/gpu/drm/panel/panel-simple.c | 50 ++++++----------------------
> 1 file changed, 11 insertions(+), 39 deletions(-)
>
> diff --git a/drivers/gpu/drm/panel/panel-simple.c b/drivers/gpu/drm/panel/panel-simple.c
> index 72f69709f349..a5df6d6dd455 100644
> --- a/drivers/gpu/drm/panel/panel-simple.c
> +++ b/drivers/gpu/drm/panel/panel-simple.c
> @@ -21,7 +21,6 @@
> * DEALINGS IN THE SOFTWARE.
> */
>
> -#include <linux/backlight.h>
> #include <linux/delay.h>
> #include <linux/gpio/consumer.h>
> #include <linux/module.h>
> @@ -105,7 +104,6 @@ struct panel_simple {
>
> const struct panel_desc *desc;
>
> - struct backlight_device *backlight;
> struct regulator *supply;
> struct i2c_adapter *ddc;
>
> @@ -236,12 +234,6 @@ static int panel_simple_disable(struct drm_panel *panel)
> if (!p->enabled)
> return 0;
>
> - if (p->backlight) {
> - p->backlight->props.power = FB_BLANK_POWERDOWN;
> - p->backlight->props.state |= BL_CORE_FBBLANK;
> - backlight_update_status(p->backlight);
> - }
> -
> if (p->desc->delay.disable)
> msleep(p->desc->delay.disable);
>
> @@ -307,12 +299,6 @@ static int panel_simple_enable(struct drm_panel *panel)
> if (p->desc->delay.enable)
> msleep(p->desc->delay.enable);
>
> - if (p->backlight) {
> - p->backlight->props.state &= ~BL_CORE_FBBLANK;
> - p->backlight->props.power = FB_BLANK_UNBLANK;
> - backlight_update_status(p->backlight);
> - }
> -
> p->enabled = true;
>
> return 0;
> @@ -414,9 +400,9 @@ static void panel_simple_parse_panel_timing_node(struct device *dev,
>
> static int panel_simple_probe(struct device *dev, const struct panel_desc *desc)
> {
> - struct device_node *backlight, *ddc;
> struct panel_simple *panel;
> struct display_timing dt;
> + struct device_node *ddc;
> int err;
>
> panel = devm_kzalloc(dev, sizeof(*panel), GFP_KERNEL);
> @@ -442,24 +428,13 @@ static int panel_simple_probe(struct device *dev, const struct panel_desc *desc)
> return err;
> }
>
> - backlight = of_parse_phandle(dev->of_node, "backlight", 0);
> - if (backlight) {
> - panel->backlight = of_find_backlight_by_node(backlight);
> - of_node_put(backlight);
> -
> - if (!panel->backlight)
> - return -EPROBE_DEFER;
> - }
> -
> ddc = of_parse_phandle(dev->of_node, "ddc-i2c-bus", 0);
> if (ddc) {
> panel->ddc = of_find_i2c_adapter_by_node(ddc);
> of_node_put(ddc);
>
> - if (!panel->ddc) {
> - err = -EPROBE_DEFER;
> - goto free_backlight;
> - }
> + if (!panel->ddc)
> + return -EPROBE_DEFER;
> }
>
> if (!of_get_display_timing(dev->of_node, "panel-timing", &dt))
> @@ -468,6 +443,10 @@ static int panel_simple_probe(struct device *dev, const struct panel_desc *desc)
> drm_panel_init(&panel->base, dev, &panel_simple_funcs,
> desc->connector_type);
>
> + err = drm_panel_of_backlight(&panel->base);
> + if (err)
> + goto free_ddc;
> +
> err = drm_panel_add(&panel->base);
> if (err < 0)
> goto free_ddc;
> @@ -479,9 +458,6 @@ static int panel_simple_probe(struct device *dev, const struct panel_desc *desc)
> free_ddc:
> if (panel->ddc)
> put_device(&panel->ddc->dev);
> -free_backlight:
> - if (panel->backlight)
> - put_device(&panel->backlight->dev);
>
> return err;
> }
> @@ -491,16 +467,12 @@ static int panel_simple_remove(struct device *dev)
> struct panel_simple *panel = dev_get_drvdata(dev);
>
> drm_panel_remove(&panel->base);
> -
> - panel_simple_disable(&panel->base);
> - panel_simple_unprepare(&panel->base);
> + drm_panel_disable(&panel->base);
> + drm_panel_unprepare(&panel->base);
>
> if (panel->ddc)
> put_device(&panel->ddc->dev);
>
> - if (panel->backlight)
> - put_device(&panel->backlight->dev);
> -
> return 0;
> }
>
> @@ -508,8 +480,8 @@ static void panel_simple_shutdown(struct device *dev)
> {
> struct panel_simple *panel = dev_get_drvdata(dev);
>
> - panel_simple_disable(&panel->base);
> - panel_simple_unprepare(&panel->base);
> + drm_panel_disable(&panel->base);
> + drm_panel_unprepare(&panel->base);
Without your panel double-disable protection series, you risk disabling
the backlight twice. I think backlight_disable() will work fine, but you
may want to double-check.
With this checked (and possibly addressed if needed),
Reviewed-by: Laurent Pinchart <laurent.pinchart@xxxxxxxxxxxxxxxx>
> }
>
> static const struct drm_display_mode ampire_am_480272h3tmqw_t01h_mode = {
--
Regards,
Laurent Pinchart
