radeonfb: fix problem with color expansion & alignment

The engine on some radeon variants locks up if color expansion is called
for non aligned source data.  This patch enables a feature of the core
fbdev to request aligned input pixmaps and uses the HW clipping engine to
clip the output to the requested size

Addresses http://bugzilla.kernel.org/show_bug.cgi?id=11875

Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Tested-by: James Cloos <cloos@jhcloos.com>
Cc: "Rafael J. Wysocki" <rjw@sisk.pl>
Cc: "David S. Miller" <davem@davemloft.net>
Cc: Krzysztof Helt <krzysztof.h1@poczta.fm>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

1 files changed, 18 insertions, 0 deletions

diff --git a/drivers/video/aty/radeon_base.c b/drivers/video/aty/radeon_base.c
index 9a5821c65ebf..b3ffe8205d2b 100644
--- a/drivers/video/aty/radeon_base.c
+++ b/drivers/video/aty/radeon_base.c
@@ -1875,6 +1875,7 @@ static int __devinit radeon_set_fbinfo (struct radeonfb_info *rinfo)
         info->fbops = &radeonfb_ops;
         info->screen_base = rinfo->fb_base;
         info->screen_size = rinfo->mapped_vram;
+
         /* Fill fix common fields */
         strlcpy(info->fix.id, rinfo->name, sizeof(info->fix.id));
         info->fix.smem_start = rinfo->fb_base_phys;
@@ -1889,8 +1890,25 @@ static int __devinit radeon_set_fbinfo (struct radeonfb_info *rinfo)
         info->fix.mmio_len = RADEON_REGSIZE;
         info->fix.accel = FB_ACCEL_ATI_RADEON;
 
+        /* Allocate colormap */
         fb_alloc_cmap(&info->cmap, 256, 0);
 
+        /* Setup pixmap used for acceleration */
+#define PIXMAP_SIZE     (2048 * 4)
+
+        info->pixmap.addr = kmalloc(PIXMAP_SIZE, GFP_KERNEL);
+        if (!info->pixmap.addr) {
+                printk(KERN_ERR "radeonfb: Failed to allocate pixmap !\n");
+                noaccel = 1;
+                goto bail;
+        }
+        info->pixmap.size = PIXMAP_SIZE;
+        info->pixmap.flags = FB_PIXMAP_SYSTEM;
+        info->pixmap.scan_align = 4;
+        info->pixmap.buf_align = 4;
+        info->pixmap.access_align = 32;
+
+bail:
         if (noaccel)
                 info->flags |= FBINFO_HWACCEL_DISABLED;