linux-kernel - [PATCH 5.10 001/122] drm/bridge: lt9611: Fix handling of 4k panels

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Date:   Mon, 20 Sep 2021 18:42:53 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Peter Collingbourne <pcc@...gle.com>,
        Robert Foss <robert.foss@...aro.org>,
        John Stultz <john.stultz@...aro.org>,
        Anibal Limon <anibal.limon@...aro.org>,
        Bjorn Andersson <bjorn.andersson@...aro.org>,
        Vinod Koul <vkoul@...nel.org>
Subject: [PATCH 5.10 001/122] drm/bridge: lt9611: Fix handling of 4k panels

From: Robert Foss <robert.foss@...aro.org>

commit d1a97648ae028a44536927c87837c45ada7141c9 upstream.

4k requires two dsi pipes, so don't report MODE_OK when only a
single pipe is configured. But rather report MODE_PANEL to
signal that requirements of the panel are not being met.

Reported-by: Peter Collingbourne <pcc@...gle.com>
Suggested-by: Peter Collingbourne <pcc@...gle.com>
Signed-off-by: Robert Foss <robert.foss@...aro.org>
Tested-by: John Stultz <john.stultz@...aro.org>
Tested-by: Anibal Limon <anibal.limon@...aro.org>
Tested-by: Peter Collingbourne <pcc@...gle.com>
Reviewed-by: Bjorn Andersson <bjorn.andersson@...aro.org>
Acked-by: Vinod Koul <vkoul@...nel.org>
Link: https://patchwork.freedesktop.org/patch/msgid/20201217140933.1133969-1-robert.foss@linaro.org
Cc: Peter Collingbourne <pcc@...gle.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
 drivers/gpu/drm/bridge/lontium-lt9611.c |    8 +++++++-
 1 file changed, 7 insertions(+), 1 deletion(-)

--- a/drivers/gpu/drm/bridge/lontium-lt9611.c
+++ b/drivers/gpu/drm/bridge/lontium-lt9611.c
@@ -867,8 +867,14 @@ static enum drm_mode_status lt9611_bridg
 						     const struct drm_display_mode *mode)
 {
 	struct lt9611_mode *lt9611_mode = lt9611_find_mode(mode);
+	struct lt9611 *lt9611 = bridge_to_lt9611(bridge);
 
-	return lt9611_mode ? MODE_OK : MODE_BAD;
+	if (!lt9611_mode)
+		return MODE_BAD;
+	else if (lt9611_mode->intfs > 1 && !lt9611->dsi1)
+		return MODE_PANEL;
+	else
+		return MODE_OK;
 }
 
 static void lt9611_bridge_pre_enable(struct drm_bridge *bridge)