linux-kernel - [v5 2/5] drm/panel-simple: Support DP AUX backlight

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Message-Id: <1622390172-31368-3-git-send-email-rajeevny@codeaurora.org>
Date:   Sun, 30 May 2021 21:26:09 +0530
From:   Rajeev Nandan <rajeevny@...eaurora.org>
To:     dri-devel@...ts.freedesktop.org, linux-arm-msm@...r.kernel.org,
        freedreno@...ts.freedesktop.org, devicetree@...r.kernel.org
Cc:     Rajeev Nandan <rajeevny@...eaurora.org>,
        linux-kernel@...r.kernel.org, thierry.reding@...il.com,
        sam@...nborg.org, robdclark@...il.com, dianders@...omium.org,
        lyude@...hat.com, jani.nikula@...el.com, robh@...nel.org,
        laurent.pinchart@...asonboard.com, a.hajda@...sung.com,
        daniel.thompson@...aro.org, hoegsberg@...omium.org,
        abhinavk@...eaurora.org, seanpaul@...omium.org,
        kalyan_t@...eaurora.org, mkrishn@...eaurora.org
Subject: [v5 2/5] drm/panel-simple: Support DP AUX backlight

If there is no backlight specified in the device tree and the panel
has access to the DP AUX channel then create a DP AUX backlight if
supported by the panel.

Signed-off-by: Rajeev Nandan <rajeevny@...eaurora.org>
---

This patch depends on [1] (drm/panel: panel-simple: Stash DP AUX bus;
allow using it for DDC) and the previous patch (2/5) of this series.

Changes in v4:
- New

Changes in v5:
- Address review comments and move backlight functions to drm_panel.c (Douglas)
- Create and register DP AUX backlight if there is no backlight specified in the
  device tree and panel has the DP AUX channel. (Douglas)
- The new drm_panel_dp_aux_backlight() will do the drm_edp_backlight_supported() check.

[1] https://lore.kernel.org/dri-devel/20210524165920.v8.7.I18e60221f6d048d14d6c50a770b15f356fa75092@changeid/

 drivers/gpu/drm/panel/panel-simple.c | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/drivers/gpu/drm/panel/panel-simple.c b/drivers/gpu/drm/panel/panel-simple.c
index b09be6e..047fad5 100644
--- a/drivers/gpu/drm/panel/panel-simple.c
+++ b/drivers/gpu/drm/panel/panel-simple.c
@@ -800,6 +800,12 @@ static int panel_simple_probe(struct device *dev, const struct panel_desc *desc,
 	if (err)
 		goto disable_pm_runtime;
 
+	if (!panel->base.backlight && panel->aux) {
+		err = drm_panel_dp_aux_backlight(&panel->base, panel->aux);
+		if (err)
+			goto disable_pm_runtime;
+	}
+
 	drm_panel_add(&panel->base);
 
 	return 0;
-- 
2.7.4