linux-kernel - [PATCH 3.19.y-ckt 40/66] video: ARM CLCD: runtime check for Versatile

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Message-Id: <1461702297-7792-41-git-send-email-kamal@canonical.com>
Date:	Tue, 26 Apr 2016 13:24:31 -0700
From:	Kamal Mostafa <kamal@...onical.com>
To:	linux-kernel@...r.kernel.org, stable@...r.kernel.org,
	kernel-team@...ts.ubuntu.com
Cc:	Rob Herring <robh@...nel.org>,
	Russell King <linux@....linux.org.uk>,
	Linus Walleij <linus.walleij@...aro.org>,
	Tomi Valkeinen <tomi.valkeinen@...com>,
	Kamal Mostafa <kamal@...onical.com>
Subject: [PATCH 3.19.y-ckt 40/66] video: ARM CLCD: runtime check for Versatile

3.19.8-ckt20 -stable review patch.  If anyone has any objections, please let me know.

---8<------------------------------------------------------------

From: Linus Walleij <linus.walleij@...aro.org>

commit f36fdacc5fcdca7b0c0d89f031fcdc89717e0be3 upstream.

The current compile-time check for inversed IENB/CNTL does not
work in multiplatform boots: as soon as versatile is included
in the build, the IENB/CNTL is switched and breaks graphics.
Convert this to a runtime switch.

Cc: Rob Herring <robh@...nel.org>
Cc: Russell King <linux@....linux.org.uk>
Fixes: a29da136de34 ("ARM: versatile: convert to multi-platform")
Signed-off-by: Linus Walleij <linus.walleij@...aro.org>
Signed-off-by: Tomi Valkeinen <tomi.valkeinen@...com>
Signed-off-by: Kamal Mostafa <kamal@...onical.com>
---
 drivers/video/fbdev/amba-clcd.c | 15 ++++++++-------
 1 file changed, 8 insertions(+), 7 deletions(-)

diff --git a/drivers/video/fbdev/amba-clcd.c b/drivers/video/fbdev/amba-clcd.c
index 32c0b6b..a9c5f60 100644
--- a/drivers/video/fbdev/amba-clcd.c
+++ b/drivers/video/fbdev/amba-clcd.c
@@ -440,13 +440,14 @@ static int clcdfb_register(struct clcd_fb *fb)
 		fb->off_ienb = CLCD_PL111_IENB;
 		fb->off_cntl = CLCD_PL111_CNTL;
 	} else {
-#ifdef CONFIG_ARCH_VERSATILE
-		fb->off_ienb = CLCD_PL111_IENB;
-		fb->off_cntl = CLCD_PL111_CNTL;
-#else
-		fb->off_ienb = CLCD_PL110_IENB;
-		fb->off_cntl = CLCD_PL110_CNTL;
-#endif
+		if (of_machine_is_compatible("arm,versatile-ab") ||
+		    of_machine_is_compatible("arm,versatile-pb")) {
+			fb->off_ienb = CLCD_PL111_IENB;
+			fb->off_cntl = CLCD_PL111_CNTL;
+		} else {
+			fb->off_ienb = CLCD_PL110_IENB;
+			fb->off_cntl = CLCD_PL110_CNTL;
+		}
 	}
 
 	fb->clk = clk_get(&fb->dev->dev, NULL);
-- 
2.7.4