[PATCH v4 03/12] drm/bridge/synopsys: dw-hdmi: Enable workaround for v1.32a

Jernej Skrabec
2018-02-07T21:17:04Z

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.

Acked-by: Laurent Pinchart <laurent.pinchart-ryLnwIuWjnjg/C1BVhZhaw@public.gmane.org>
Signed-off-by: Jernej Skrabec <jernej.skrabec-gGgVlfcn5nU@public.gmane.org>
---
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:
--
2.16.1