linux-kernel - [PATCH 3.16 40/63] video: fbdev: Set pixclock = 0 in goldfishfb

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Date:   Wed, 08 Jan 2020 19:43:38 +0000
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>,
        "Roman Kiryanov" <rkir@...gle.com>,
        "Bartlomiej Zolnierkiewicz" <b.zolnierkie@...sung.com>,
        "Christoffer Dall" <christoffer.dall@...aro.org>,
        "Peter Maydell" <peter.maydell@...aro.org>,
        "Arnd Bergmann" <arnd@...db.de>
Subject: [PATCH 3.16 40/63] video: fbdev: Set pixclock = 0 in goldfishfb

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

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

From: Christoffer Dall <christoffer.dall@...aro.org>

commit ace6033ec5c356615eaa3582fb1946e9eaff6662 upstream.

User space Android code identifies pixclock == 0 as a sign for emulation
and will set the frame rate to 60 fps when reading this value, which is
the desired outcome.

Signed-off-by: Christoffer Dall <christoffer.dall@...aro.org>
Signed-off-by: Peter Maydell <peter.maydell@...aro.org>
Signed-off-by: Roman Kiryanov <rkir@...gle.com>
Signed-off-by: Bartlomiej Zolnierkiewicz <b.zolnierkie@...sung.com>
Cc: Arnd Bergmann <arnd@...db.de>
Signed-off-by: Ben Hutchings <ben@...adent.org.uk>
---
 drivers/video/fbdev/goldfishfb.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/drivers/video/fbdev/goldfishfb.c
+++ b/drivers/video/fbdev/goldfishfb.c
@@ -234,7 +234,7 @@ static int goldfish_fb_probe(struct plat
 	fb->fb.var.activate	= FB_ACTIVATE_NOW;
 	fb->fb.var.height	= readl(fb->reg_base + FB_GET_PHYS_HEIGHT);
 	fb->fb.var.width	= readl(fb->reg_base + FB_GET_PHYS_WIDTH);
-	fb->fb.var.pixclock	= 10000;
+	fb->fb.var.pixclock	= 0;
 
 	fb->fb.var.red.offset = 11;
 	fb->fb.var.red.length = 5;