drm/mgag200: Set MISC memory flags in mm init code

The modesetting code initialized several memory-related flags in the
MISC register. Move this code to MM initialization.
Signed-off-by: Thomas Zimmermann <tzimmermann@suse.de>
Reviewed-by: Lyude Paul <lyude@redhat.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20200730102844.10995-6-tzimmermann@suse.de

drivers/gpu/drm/mgag200/mgag200_mm.c

@@ -90,9 +90,15 @@ static void mgag200_mm_release(struct drm_device *dev, void *ptr)
 int mgag200_mm_init(struct mga_device *mdev)
 {
 	struct drm_device *dev = &mdev->base;
+	u8 misc;
 	resource_size_t start, len;
 	int ret;
 
+	misc = RREG8(MGA_MISC_IN);
+	misc |= MGAREG_MISC_RAMMAPEN |
+		MGAREG_MISC_HIGH_PG_SEL;
+	WREG8(MGA_MISC_OUT, misc);
+
 	/* BAR 0 is VRAM */
 	start = pci_resource_start(dev->pdev, 0);
 	len = pci_resource_len(dev->pdev, 0);

drivers/gpu/drm/mgag200/mgag200_mode.c

@@ -978,9 +978,7 @@ static void mgag200_init_regs(struct mga_device *mdev)
 		WREG_ECRT(0x34, 0x5);
 
 	misc = RREG8(MGA_MISC_IN);
-	misc |= MGAREG_MISC_IOADSEL |
-		MGAREG_MISC_RAMMAPEN |
-		MGAREG_MISC_HIGH_PG_SEL;
+	misc |= MGAREG_MISC_IOADSEL;
 	WREG8(MGA_MISC_OUT, misc);
 }