intelfb -- uses stride alignment of 64 on the 9xx chipsets.

Signed-off-by: Dennis Munsie <dmunsie@cecropia.com>
Signed-off-by: Dave Airlie <airlied@linux.ie>

drivers/video/intelfb/intelfb.h

@@ -59,6 +59,7 @@
 #define INTEL_REG_SIZE			0x80000
 
 #define STRIDE_ALIGNMENT		16
+#define STRIDE_ALIGNMENT_I9XX		64
 
 #define PALETTE_8_ENTRIES		256
 

drivers/video/intelfb/intelfbdrv.c

@@ -1141,7 +1141,10 @@ update_dinfo(struct intelfb_info *dinfo, struct fb_var_screeninfo *var)
 	}
 
 	/* Make sure the line length is a aligned correctly. */
-	dinfo->pitch = ROUND_UP_TO(dinfo->pitch, STRIDE_ALIGNMENT);
+	if (IS_I9XX(dinfo))
+		dinfo->pitch = ROUND_UP_TO(dinfo->pitch, STRIDE_ALIGNMENT_I9XX);
+	else
+		dinfo->pitch = ROUND_UP_TO(dinfo->pitch, STRIDE_ALIGNMENT);
 
 	if (FIXED_MODE(dinfo))
 		dinfo->pitch = dinfo->initial_pitch;

drivers/video/intelfb/intelfbhw.c

@@ -1005,6 +1005,7 @@ intelfbhw_mode_to_hw(struct intelfb_info *dinfo, struct intelfb_hwstate *hw,
 	u32 vsync_start, vsync_end, vblank_start, vblank_end, vtotal, vactive;
 	u32 vsync_pol, hsync_pol;
 	u32 *vs, *vb, *vt, *hs, *hb, *ht, *ss, *pipe_conf;
+	u32 stride_alignment;
 
 	DBG_MSG("intelfbhw_mode_to_hw\n");
 
@@ -1216,9 +1217,11 @@ intelfbhw_mode_to_hw(struct intelfb_info *dinfo, struct intelfb_hwstate *hw,
 	hw->disp_a_base += dinfo->fb.offset << 12;
 
 	/* Check stride alignment. */
-	if (hw->disp_a_stride % STRIDE_ALIGNMENT != 0) {
+	stride_alignment = IS_I9XX(dinfo) ? STRIDE_ALIGNMENT_I9XX :
+					    STRIDE_ALIGNMENT;
+	if (hw->disp_a_stride % stride_alignment != 0) {
 		WRN_MSG("display stride %d has bad alignment %d\n",
-			hw->disp_a_stride, STRIDE_ALIGNMENT);
+			hw->disp_a_stride, stride_alignment);
 		return 1;
 	}