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From:   Robert Foss <robert.foss@linaro.org>
To:     a.hajda@samsung.com, narmstrong@baylibre.com,
        Laurent.pinchart@ideasonboard.com, jonas@kwiboo.se,
        jernej.skrabec@siol.net, airlied@linux.ie, daniel@ffwll.ch,
        dri-devel@lists.freedesktop.org, linux-kernel@vger.kernel.org,
        John Stultz <john.stultz@linaro.org>,
        Peter Collingbourne <pcc@google.com>
Cc:     Alistair Delva <adelva@google.com>,
        Vinod Koul <vinod.koul@linaro.org>,
        Anibal Limon <anibal.limon@linaro.org>,
        Bjorn Andersson <bjorn.andersson@linaro.org>,
        Robert Foss <robert.foss@linaro.org>
Subject: [PATCH v1] drm/bridge: lt9611: Fix handling of 4k panels
Date:   Mon, 23 Nov 2020 11:46:16 +0100
Message-Id: <20201123104616.1412688-1-robert.foss@linaro.org>
MIME-Version: 1.0
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Precedence: bulk

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@google.com>
Suggested-by: Peter Collingbourne <pcc@google.com>
Signed-off-by: Robert Foss <robert.foss@linaro.org>
Tested-by: John Stultz <john.stultz@linaro.org>
---
 drivers/gpu/drm/bridge/lontium-lt9611.c | 8 +++++++-
 1 file changed, 7 insertions(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/bridge/lontium-lt9611.c b/drivers/gpu/drm/bridge/lontium-lt9611.c
index d734d9402c35..e8eb8deb444b 100644
--- 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_bridge_mode_valid(struct drm_bridge *bridge,
 						     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)
-- 
2.27.0