linux-kernel - [PATCH v3 1/3] fb.h: Provide alternate screen

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Date:	Wed, 7 Oct 2015 09:20:12 +0200
From:	Lars Svensson <lars1.svensson@...ymobile.com>
To:	<thomas.petazzoni@...e-electrons.com>, <noralf@...nnes.org>,
	<plagnioj@...osoft.com>, <tomi.valkeinen@...com>
CC:	<linux-fbdev@...r.kernel.org>, <gregkh@...uxfoundation.org>,
	<devel@...verdev.osuosl.org>, <linux-kernel@...r.kernel.org>,
	<dan.carpenter@...cle.com>,
	Lars Svensson <lars1.svensson@...ymobile.com>
Subject: [PATCH v3 1/3] fb.h: Provide alternate screen_base pointer

Some drivers use member screen_base of struct fb_info to store non-
__iomem pointers, creating the need for ugly __force typecasts to
avoid sparse warnings. This adds an alternate pointer without the
__iomem qualifyer for this use.

Signed-off-by: Lars Svensson <lars1.svensson@...ymobile.com>
---
Patch v3: bugfix in fbtft-bus.c:fbtft_write_vmem16_bus9() in
a separate commit.
---
 include/linux/fb.h | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/include/linux/fb.h b/include/linux/fb.h
index bc9afa7..41a3b11 100644
--- a/include/linux/fb.h
+++ b/include/linux/fb.h
@@ -483,7 +483,10 @@ struct fb_info {
 #ifdef CONFIG_FB_TILEBLITTING
 	struct fb_tile_ops *tileops;    /* Tile Blitting */
 #endif
-	char __iomem *screen_base;	/* Virtual address */
+	union {
+		char __iomem *screen_base;	/* Virtual address */
+		char *screen_buffer;
+	};
 	unsigned long screen_size;	/* Amount of ioremapped VRAM or 0 */ 
 	void *pseudo_palette;		/* Fake palette of 16 colors */ 
 #define FBINFO_STATE_RUNNING	0
-- 
2.4.2

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