linux-kernel - [PATCH] video: ARM CLCD: Correcting timing checks for STN and TFT dispalys

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Date:	Wed, 25 Feb 2015 13:01:22 -0800
From:	Arun Ramamurthy <arun.ramamurthy@...adcom.com>
To:	Rob Herring <robh+dt@...nel.org>, Pawel Moll <pawel.moll@....com>,
	"Mark Rutland" <mark.rutland@....com>,
	Ian Campbell <ijc+devicetree@...lion.org.uk>,
	Kumar Gala <galak@...eaurora.org>,
	"Russell King" <linux@....linux.org.uk>,
	Jean-Christophe Plagniol-Villard <plagnioj@...osoft.com>,
	Tomi Valkeinen <tomi.valkeinen@...com>
CC:	<devicetree@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
	<linux-fbdev@...r.kernel.org>, Dmitry Torokhov <dtor@...gle.com>,
	"Anatol Pomazau" <anatol@...gle.com>,
	Jonathan Richardson <jonathar@...adcom.com>,
	Scott Branden <sbranden@...adcom.com>,
	Ray Jui <rjui@...adcom.com>,
	<bcm-kernel-feedback-list@...adcom.com>,
	Arun Ramamurthy <arun.ramamurthy@...adcom.com>
Subject: [PATCH] video: ARM CLCD: Correcting timing checks for STN and TFT dispalys

The minimum values for timing parameters such as left margin,
right margin etc are different for STN and TFT dispalys.
This commit fixes a check that does not account for
this difference.

Reviewed-by: Ray Jui <rjui@...adcom.com>
Reviewed-by: Scott Branden <sbranden@...adcom.com>
Signed-off-by: Arun Ramamurthy <arun.ramamurthy@...adcom.com>
---
 include/linux/amba/clcd.h | 32 ++++++++++++++++++++++----------
 1 file changed, 22 insertions(+), 10 deletions(-)

diff --git a/include/linux/amba/clcd.h b/include/linux/amba/clcd.h
index 6a3bc2d..0fe8a17 100644
--- a/include/linux/amba/clcd.h
+++ b/include/linux/amba/clcd.h
@@ -288,16 +288,28 @@ static inline int clcdfb_check(struct clcd_fb *fb, struct fb_var_screeninfo *var
 	var->xres_virtual = var->xres = (var->xres + 15) & ~15;
 	var->yres_virtual = var->yres = (var->yres + 1) & ~1;
 
-#define CHECK(e,l,h) (var->e < l || var->e > h)
-	if (CHECK(right_margin, (5+1), 256) ||	/* back porch */
-	    CHECK(left_margin, (5+1), 256) ||	/* front porch */
-	    CHECK(hsync_len, (5+1), 256) ||
-	    var->xres > 4096 ||
-	    var->lower_margin > 255 ||		/* back porch */
-	    var->upper_margin > 255 ||		/* front porch */
-	    var->vsync_len > 32 ||
-	    var->yres > 1024)
-		return -EINVAL;
+#define CHECK(e, l, h) (var->e < l || var->e > h)
+	if (!(fb->panel->cntl & CNTL_LCDTFT)) {
+		if (CHECK(right_margin, (5+1), 256) ||	/* back porch */
+		CHECK(left_margin, (5+1), 256) ||	/* front porch */
+		CHECK(hsync_len, (5+1), 256) ||
+		var->xres > 4096 ||
+		var->lower_margin > 255 ||	/* back porch */
+		var->upper_margin > 255 ||	/* front porch */
+		var->vsync_len > 32 ||
+		var->yres > 1024)
+			return -EINVAL;
+	} else {
+		if (CHECK(right_margin, 1, 256) ||	/* back porch */
+		CHECK(left_margin, 1, 256) ||	/* front porch */
+		CHECK(hsync_len, 1, 256) ||
+		var->xres > 4096 ||
+		var->lower_margin > 255 ||	/* back porch */
+		var->upper_margin > 255 ||	/* front porch */
+		var->vsync_len > 32 ||
+		var->yres > 1024)
+			return -EINVAL;
+	}
 #undef CHECK
 
 	/* single panel mode: PCD = max(PCD, 1) */
-- 
2.3.0

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