[PATCH] matroxfb: Use CACHEFLUSH on all chips

Use the CACHEFLUSH register on all chip types.  The register is listed in all
other specs except 2064W.  However I have verified that the register does work
on a 2064W despite being marked reserved in the specs.  There were no
noticeable side effects after writing to the register.
Signed-off-by: Ville Syrjälä <syrjala@sci.fi>
Signed-off-by: Petr Vandrovec <petr@vandrovec.name>
Cc: "Antonino A. Daplas" <adaplas@pol.net>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

drivers/video/matrox/matroxfb_DAC1064.c

@@ -657,7 +657,6 @@ static int MGA1064_preinit(WPMINFO2) {
 	/* ACCESS_FBINFO(capable.cfb4) = 0; ... preinitialized by 0 */
 	ACCESS_FBINFO(capable.text) = 1;
 	ACCESS_FBINFO(capable.vxres) = vxres_mystique;
-	ACCESS_FBINFO(features.accel.has_cacheflush) = 1;
 
 	ACCESS_FBINFO(outputs[0]).output = &m1064;
 	ACCESS_FBINFO(outputs[0]).src = ACCESS_FBINFO(outputs[0]).default_src;
@@ -842,7 +841,6 @@ static int MGAG100_preinit(WPMINFO2) {
 	/* ACCESS_FBINFO(capable.cfb4) = 0; ... preinitialized by 0 */
 	ACCESS_FBINFO(capable.text) = 1;
 	ACCESS_FBINFO(capable.vxres) = vxres_g100;
-	ACCESS_FBINFO(features.accel.has_cacheflush) = 1;
 	ACCESS_FBINFO(capable.plnwt) = ACCESS_FBINFO(devflags.accelerator) == FB_ACCEL_MATROX_MGAG100
 			? ACCESS_FBINFO(devflags.sgram) : 1;
 

drivers/video/matrox/matroxfb_base.c

@@ -1283,7 +1283,7 @@ static int matroxfb_getmemory(WPMINFO unsigned int maxSize, unsigned int *realSi
 	vaddr_t vm;
 	unsigned int offs;
 	unsigned int offs2;
-	unsigned char store, orig;
+	unsigned char orig;
 	unsigned char bytes[32];
 	unsigned char* tmp;
 
@@ -1299,16 +1299,12 @@ static int matroxfb_getmemory(WPMINFO unsigned int maxSize, unsigned int *realSi
 	orig = mga_inb(M_EXTVGA_DATA);
 	mga_outb(M_EXTVGA_DATA, orig | 0x80);
 
-	store = mga_readb(vm, 0x1234);
 	tmp = bytes;
 	for (offs = 0x100000; offs < maxSize; offs += 0x200000)
 		*tmp++ = mga_readb(vm, offs);
 	for (offs = 0x100000; offs < maxSize; offs += 0x200000)
 		mga_writeb(vm, offs, 0x02);
-	if (ACCESS_FBINFO(features.accel.has_cacheflush))
-		mga_outb(M_CACHEFLUSH, 0x00);
-	else
-		mga_writeb(vm, 0x1234, 0x99);
+	mga_outb(M_CACHEFLUSH, 0x00);
 	for (offs = 0x100000; offs < maxSize; offs += 0x200000) {
 		if (mga_readb(vm, offs) != 0x02)
 			break;
@@ -1319,7 +1315,6 @@ static int matroxfb_getmemory(WPMINFO unsigned int maxSize, unsigned int *realSi
 	tmp = bytes;
 	for (offs2 = 0x100000; offs2 < maxSize; offs2 += 0x200000)
 		mga_writeb(vm, offs2, *tmp++);
-	mga_writeb(vm, 0x1234, store);
 
 	mga_outb(M_EXTVGA_INDEX, 0x03);
 	mga_outb(M_EXTVGA_DATA, orig);

drivers/video/matrox/matroxfb_base.h

@@ -272,10 +272,6 @@ struct matrox_DAC1064_features {
 	u_int8_t	xmiscctrl;
 };
 
-struct matrox_accel_features {
-	int		has_cacheflush;
-};
-
 /* current hardware status */
 struct mavenregs {
 	u_int8_t regs[256];
@@ -440,7 +436,6 @@ struct matrox_fb_info {
 	struct {
 		struct matrox_pll_features pll;
 		struct matrox_DAC1064_features DAC1064;
-		struct matrox_accel_features accel;
 			      } features;
 	struct {
 		spinlock_t	DAC;