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43 lines
1.7 KiB
Diff
43 lines
1.7 KiB
Diff
From 6e06b05d4d0128f3fcc32085f31c2b4add4c0ac7 Mon Sep 17 00:00:00 2001
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From: Jernej Skrabec <jernej.skrabec@siol.net>
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Date: Sat, 2 Sep 2017 19:41:54 +0200
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Subject: [PATCH] drm: bridge: Enable workaround in dw_hdmi for v1.32a
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Allwinner SoCs have dw hdmi controller v1.32a which exhibits same
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magenta line issue as i.MX6Q and i.MX6DL. Enable workaround for it.
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Allwinner never released any kind of dw hdmi or errata documentation,
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so it is not clear how many iterations need to be executed. One
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iteration seems to be enough.
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Signed-off-by: Jernej Skrabec <jernej.skrabec@siol.net>
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---
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drivers/gpu/drm/bridge/synopsys/dw-hdmi.c | 8 +++++---
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1 file changed, 5 insertions(+), 3 deletions(-)
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diff --git a/drivers/gpu/drm/bridge/synopsys/dw-hdmi.c b/drivers/gpu/drm/bridge/synopsys/dw-hdmi.c
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index 09cb5a3e4c718..72969240a9d42 100644
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--- a/drivers/gpu/drm/bridge/synopsys/dw-hdmi.c
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+++ b/drivers/gpu/drm/bridge/synopsys/dw-hdmi.c
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@@ -1631,9 +1631,10 @@ static void dw_hdmi_clear_overflow(struct dw_hdmi *hdmi)
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* then write one of the FC registers several times.
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*
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* The number of iterations matters and depends on the HDMI TX revision
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- * (and possibly on the platform). So far only i.MX6Q (v1.30a) and
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- * i.MX6DL (v1.31a) have been identified as needing the workaround, with
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- * 4 and 1 iterations respectively.
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+ * (and possibly on the platform). So far i.MX6Q (v1.30a), i.MX6DL
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+ * (v1.31a) and multiple Allwinner SoCs (v1.32a) have been identified
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+ * as needing the workaround, with 4 iterations for v1.30a and 1
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+ * iteration for others.
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*/
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switch (hdmi->version) {
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@@ -1641,6 +1642,7 @@ static void dw_hdmi_clear_overflow(struct dw_hdmi *hdmi)
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count = 4;
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break;
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case 0x131a:
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+ case 0x132a:
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count = 1;
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break;
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default:
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