linux-kernel - [PATCH 3.16 220/305] drm/ast: change resolution may cause screen blurred

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Message-ID: <lsq.1549201508.370087170@decadent.org.uk>
Date:   Sun, 03 Feb 2019 14:45:08 +0100
From:   Ben Hutchings <ben@...adent.org.uk>
To:     linux-kernel@...r.kernel.org, stable@...r.kernel.org
CC:     akpm@...ux-foundation.org, Denis Kirjanov <kda@...ux-powerpc.org>,
        "Y.C. Chen" <yc_chen@...eedtech.com>,
        "Jean Delvare" <jdelvare@...e.de>,
        "Dave Airlie" <airlied@...hat.com>
Subject: [PATCH 3.16 220/305] drm/ast: change resolution may cause screen
 blurred

3.16.63-rc1 review patch.  If anyone has any objections, please let me know.

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

From: "Y.C. Chen" <yc_chen@...eedtech.com>

commit 1a37bd823891568f8721989aed0615835632d81a upstream.

The value of pitches is not correct while calling mode_set.
The issue we found so far on following system:
- Debian8 with XFCE Desktop
- Ubuntu with KDE Desktop
- SUSE15 with KDE Desktop

Signed-off-by: Y.C. Chen <yc_chen@...eedtech.com>
Tested-by: Jean Delvare <jdelvare@...e.de>
Reviewed-by: Jean Delvare <jdelvare@...e.de>
Signed-off-by: Dave Airlie <airlied@...hat.com>
Signed-off-by: Ben Hutchings <ben@...adent.org.uk>
---
 drivers/gpu/drm/ast/ast_mode.c | 1 +
 1 file changed, 1 insertion(+)

--- a/drivers/gpu/drm/ast/ast_mode.c
+++ b/drivers/gpu/drm/ast/ast_mode.c
@@ -527,6 +527,7 @@ static int ast_crtc_do_set_base(struct d
 	}
 	ast_bo_unreserve(bo);
 
+	ast_set_offset_reg(crtc);
 	ast_set_start_address_crt1(crtc, (u32)gpu_addr);
 
 	return 0;