linux-kernel - [PATCH AUTOSEL 5.6 20/79] drm/bridge: anx6345: set correct BPC for display

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Date:   Thu, 30 Apr 2020 09:49:44 -0400
From:   Sasha Levin <sashal@...nel.org>
To:     linux-kernel@...r.kernel.org, stable@...r.kernel.org
Cc:     Vasily Khoruzhick <anarsoul@...il.com>,
        Jernej Skrabec <jernej.skrabec@...l.net>,
        Sasha Levin <sashal@...nel.org>,
        dri-devel@...ts.freedesktop.org
Subject: [PATCH AUTOSEL 5.6 20/79] drm/bridge: anx6345: set correct BPC for display_info of connector

From: Vasily Khoruzhick <anarsoul@...il.com>

[ Upstream commit 1e8a6ce9186dbf342eebc07cf14cae5e82164e03 ]

Some drivers (e.g. sun4i-drm) need this info to decide whether they
need to enable dithering. Currently driver reports what panel supports
and if panel supports 8 we don't get dithering enabled.

Hardcode BPC to 6 for now since that's the only BPC
that driver supports.

Fixes: 6aa192698089 ("drm/bridge: Add Analogix anx6345 support")
Signed-off-by: Vasily Khoruzhick <anarsoul@...il.com>
Acked-by: Jernej Skrabec <jernej.skrabec@...l.net>
Signed-off-by: Jernej Skrabec <jernej.skrabec@...l.net>
Link: https://patchwork.freedesktop.org/patch/msgid/20200329222253.2941405-1-anarsoul@gmail.com
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 drivers/gpu/drm/bridge/analogix/analogix-anx6345.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/drivers/gpu/drm/bridge/analogix/analogix-anx6345.c b/drivers/gpu/drm/bridge/analogix/analogix-anx6345.c
index 526507102c1ea..8d32fea84c75e 100644
--- a/drivers/gpu/drm/bridge/analogix/analogix-anx6345.c
+++ b/drivers/gpu/drm/bridge/analogix/analogix-anx6345.c
@@ -485,6 +485,9 @@ static int anx6345_get_modes(struct drm_connector *connector)
 
 	num_modes += drm_add_edid_modes(connector, anx6345->edid);
 
+	/* Driver currently supports only 6bpc */
+	connector->display_info.bpc = 6;
+
 unlock:
 	if (power_off)
 		anx6345_poweroff(anx6345);
-- 
2.20.1