From: Russell King <rmk@dyn-67.arm.linux.org.uk>
Date: Thu, 28 Apr 2005 09:43:52 +0000 (+0100)
Subject: [PATCH] ARM: Fix AMBA CLCD fb driver for 32bpp
X-Git-Url: https://git.stricted.de/?a=commitdiff_plain;h=82235e9170f19fa327361ee82a76618e60f2db47;p=GitHub%2FLineageOS%2FG12%2Fandroid_kernel_amlogic_linux-4.9.git

[PATCH] ARM: Fix AMBA CLCD fb driver for 32bpp

We were supporting 24bpp.  However, the pixel organisation in
memory was 0RGB, so it was 24bpp in 32bit words.  This means
we're actually supporting 32bpp and not 24bpp.

Also, add a check to ensure that we don't exceed the available
framebuffer when changing display resolutions.

Signed-off-by: Russell King <rmk@arm.linux.org.uk>
---

diff --git a/drivers/video/amba-clcd.c b/drivers/video/amba-clcd.c
index 075d3961a119..3e386fd4c5c6 100644
--- a/drivers/video/amba-clcd.c
+++ b/drivers/video/amba-clcd.c
@@ -146,7 +146,7 @@ clcdfb_set_bitfields(struct clcd_fb *fb, struct fb_var_screeninfo *var)
 			var->blue.offset	= 10;
 		}
 		break;
-	case 24:
+	case 32:
 		if (fb->panel->cntl & CNTL_LCDTFT) {
 			var->red.length		= 8;
 			var->green.length	= 8;
@@ -178,6 +178,12 @@ static int clcdfb_check_var(struct fb_var_screeninfo *var, struct fb_info *info)
 
 	if (fb->board->check)
 		ret = fb->board->check(fb, var);
+
+	if (ret == 0 &&
+	    var->xres_virtual * var->bits_per_pixel / 8 *
+	    var->yres_virtual > fb->fb.fix.smem_len)
+		ret = -EINVAL;
+
 	if (ret == 0)
 		ret = clcdfb_set_bitfields(fb, var);
 
diff --git a/include/asm-arm/hardware/amba_clcd.h b/include/asm-arm/hardware/amba_clcd.h
index 476b6398ae1e..d6ad33e52ea9 100644
--- a/include/asm-arm/hardware/amba_clcd.h
+++ b/include/asm-arm/hardware/amba_clcd.h
@@ -211,7 +211,7 @@ static inline void clcdfb_decode(struct clcd_fb *fb, struct clcd_regs *regs)
 	case 16:
 		val |= CNTL_LCDBPP16;
 		break;
-	case 24:
+	case 32:
 		val |= CNTL_LCDBPP24;
 		break;
 	}