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List:       linux-arm-kernel
Subject:    [PATCH 03/11] drm/bridge/synopsys: dw-hdmi: Enable workaround for v1.32a
From:       Jernej Skrabec <jernej.skrabec () siol ! net>
Date:       2017-12-30 21:01:55
Message-ID: 20171230210203.24115-4-jernej.skrabec () siol ! net
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Allwinner SoCs have dw hdmi controller v1.32a which exhibits same
magenta line issue as i.MX6Q and i.MX6DL. Enable workaround for it.

Tests show that one iteration is enough.

Signed-off-by: Jernej Skrabec <jernej.skrabec@siol.net>
---
 drivers/gpu/drm/bridge/synopsys/dw-hdmi.c | 8 +++++---
 1 file changed, 5 insertions(+), 3 deletions(-)

diff --git a/drivers/gpu/drm/bridge/synopsys/dw-hdmi.c b/drivers/gpu/drm/bridge/synopsys/dw-hdmi.c
index a38db40ce990..7ca14d7325b5 100644
--- a/drivers/gpu/drm/bridge/synopsys/dw-hdmi.c
+++ b/drivers/gpu/drm/bridge/synopsys/dw-hdmi.c
@@ -1634,9 +1634,10 @@ static void dw_hdmi_clear_overflow(struct dw_hdmi *hdmi)
 	 * then write one of the FC registers several times.
 	 *
 	 * The number of iterations matters and depends on the HDMI TX revision
-	 * (and possibly on the platform). So far only i.MX6Q (v1.30a) and
-	 * i.MX6DL (v1.31a) have been identified as needing the workaround, with
-	 * 4 and 1 iterations respectively.
+	 * (and possibly on the platform). So far i.MX6Q (v1.30a), i.MX6DL
+	 * (v1.31a) and multiple Allwinner SoCs (v1.32a) have been identified
+	 * as needing the workaround, with 4 iterations for v1.30a and 1
+	 * iteration for others.
 	 */
 
 	switch (hdmi->version) {
@@ -1644,6 +1645,7 @@ static void dw_hdmi_clear_overflow(struct dw_hdmi *hdmi)
 		count = 4;
 		break;
 	case 0x131a:
+	case 0x132a:
 		count = 1;
 		break;
 	default:
-- 
2.15.1


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