linux-kernel - [PATCH 4.14 02/80] drm: bridge: dw-hdmi: Fix overflow workaround for Amlogic Meson GX SoCs

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Date:   Fri, 27 Apr 2018 15:57:55 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Archit Taneja <architt@...eaurora.org>,
        Neil Armstrong <narmstrong@...libre.com>
Subject: [PATCH 4.14 02/80] drm: bridge: dw-hdmi: Fix overflow workaround for Amlogic Meson GX SoCs

4.14-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Neil Armstrong <narmstrong@...libre.com>

commit 9c305eb442f3b371fc722ade827bbf673514123e upstream.

The Amlogic Meson GX SoCs, embedded the v2.01a controller, has been also
identified needing this workaround.
This patch adds the corresponding version to enable a single iteration for
this specific version.

Fixes: be41fc55f1aa ("drm: bridge: dw-hdmi: Handle overflow workaround based on device version")
Acked-by: Archit Taneja <architt@...eaurora.org>
[narmstrong: s/identifies/identified and rebased against Jernej's change]
Signed-off-by: Neil Armstrong <narmstrong@...libre.com>
Link: https://patchwork.freedesktop.org/patch/msgid/1519386277-25902-1-git-send-email-narmstrong@baylibre.com
[narmstrong: v4.14 to v4.16 backport]
Cc: <stable@...r.kernel.org> # 4.14.x
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
 drivers/gpu/drm/bridge/synopsys/dw-hdmi.c |    3 +++
 1 file changed, 3 insertions(+)

--- a/drivers/gpu/drm/bridge/synopsys/dw-hdmi.c
+++ b/drivers/gpu/drm/bridge/synopsys/dw-hdmi.c
@@ -1634,6 +1634,8 @@ static void dw_hdmi_clear_overflow(struc
 	 * (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.
+	 * The Amlogic Meson GX SoCs (v2.01a) have been identified as needing
+	 * the workaround with a single iteration.
 	 */
 
 	switch (hdmi->version) {
@@ -1641,6 +1643,7 @@ static void dw_hdmi_clear_overflow(struc
 		count = 4;
 		break;
 	case 0x131a:
+	case 0x201a:
 		count = 1;
 		break;
 	default: