linux-kernel - [PATCH v1 2/5] drm: bridge: dw_hdmi: enable overflow workaround for v2.13a

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Date:   Wed,  6 Apr 2022 16:48:34 +0800
From:   Sandor.yu@....com
To:     dri-devel@...ts.freedesktop.org, linux-kernel@...r.kernel.org,
        andrzej.hajda@...el.com, narmstrong@...libre.com,
        robert.foss@...aro.org, Laurent.pinchart@...asonboard.com,
        jonas@...boo.se, jernej.skrabec@...il.com
Cc:     Sandor.yu@....com, shengjiu.wang@....com, cai.huoqing@...ux.dev,
        maxime@...no.tech, harry.wentland@....com,
        hverkuil-cisco@...all.nl, amuel@...lland.org
Subject: [PATCH v1 2/5] drm: bridge: dw_hdmi: enable overflow workaround for v2.13a

From: Sandor Yu <Sandor.yu@....com>

iMX865 HDMI (v2.13a) have been identified as needing the workaround.
Tests show that one iteration is enough.

Without the workaround, iMX865 HDMI audio may not work
after cable plugout/in, because HDMI mode is not really set in
register HDMI_FC_INVIDCONF.

Signed-off-by: Sandor Yu <Sandor.yu@....com>
---
 drivers/gpu/drm/bridge/synopsys/dw-hdmi.c | 7 ++++---
 1 file changed, 4 insertions(+), 3 deletions(-)

diff --git a/drivers/gpu/drm/bridge/synopsys/dw-hdmi.c b/drivers/gpu/drm/bridge/synopsys/dw-hdmi.c
index 4befc104d220..b11577de4836 100644
--- a/drivers/gpu/drm/bridge/synopsys/dw-hdmi.c
+++ b/drivers/gpu/drm/bridge/synopsys/dw-hdmi.c
@@ -2087,9 +2087,9 @@ static void dw_hdmi_clear_overflow(struct dw_hdmi *hdmi)
 	 *
 	 * The number of iterations matters and depends on the HDMI TX revision
 	 * (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.
+	 * (v1.31a), iMX865(v2.13a) and multiple Allwinner SoCs (v1.32a)
+	 * have been identified as needing the workaround,
+	 * with 4 iterations for v1.30a and 1 iteration for others.
 	 * The Amlogic Meson GX SoCs (v2.01a) have been identified as needing
 	 * the workaround with a single iteration.
 	 * The Rockchip RK3288 SoC (v2.00a) and RK3328/RK3399 SoCs (v2.11a) have
@@ -2106,6 +2106,7 @@ static void dw_hdmi_clear_overflow(struct dw_hdmi *hdmi)
 	case 0x201a:
 	case 0x211a:
 	case 0x212a:
+	case 0x213a:
 		count = 1;
 		break;
 	default:
-- 
2.25.1