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From:   Rajeev Nandan <rajeevny@codeaurora.org>
To:     dri-devel@lists.freedesktop.org, linux-arm-msm@vger.kernel.org,
        freedreno@lists.freedesktop.org, devicetree@vger.kernel.org
Cc:     Rajeev Nandan <rajeevny@codeaurora.org>,
        linux-kernel@vger.kernel.org, thierry.reding@gmail.com,
        sam@ravnborg.org, robdclark@gmail.com, dianders@chromium.org,
        lyude@redhat.com, jani.nikula@intel.com, robh@kernel.org,
        laurent.pinchart@ideasonboard.com, a.hajda@samsung.com,
        daniel.thompson@linaro.org, hoegsberg@chromium.org,
        abhinavk@codeaurora.org, seanpaul@chromium.org,
        kalyan_t@codeaurora.org, mkrishn@codeaurora.org,
        lee.jones@linaro.org, jingoohan1@gmail.com,
        linux-fbdev@vger.kernel.org
Subject: [v6 2/5] drm/panel-simple: Support DP AUX backlight
Date:   Sat, 12 Jun 2021 17:37:59 +0530
Message-Id: <1623499682-2140-3-git-send-email-rajeevny@codeaurora.org>
In-Reply-To: <1623499682-2140-1-git-send-email-rajeevny@codeaurora.org>
References: <1623499682-2140-1-git-send-email-rajeevny@codeaurora.org>
Precedence: bulk

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

(no changes since v5)

This patch depends on 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.

 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 df6fbd1..26555ec 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