apply dmacoherent patch for arm64

Author: nicholasaiello

arch/arm64/configs/bcm2711_defconfig

@@ -1064,6 +1064,11 @@ CONFIG_AUXDISPLAY=y
 CONFIG_HD44780=m
 CONFIG_DRM=m
 CONFIG_DRM_LOAD_EDID_FIRMWARE=y
+CONFIG_DRM_AMDGPU=m
+CONFIG_DRM_AMDGPU_SI=y
+CONFIG_DRM_AMDGPU_CIK=y
+CONFIG_DRM_XE=m
+CONFIG_DRM_XE_FORCE_PROBE="*"
 CONFIG_DRM_UDL=m
 CONFIG_DRM_PANEL_LVDS=m
 CONFIG_DRM_PANEL_ILITEK_ILI9806E=m

arch/arm64/configs/bcm2712_defconfig

@@ -1066,6 +1066,11 @@ CONFIG_AUXDISPLAY=y
 CONFIG_HD44780=m
 CONFIG_DRM=m
 CONFIG_DRM_LOAD_EDID_FIRMWARE=y
+CONFIG_DRM_AMDGPU=m
+CONFIG_DRM_AMDGPU_SI=y
+CONFIG_DRM_AMDGPU_CIK=y
+CONFIG_DRM_XE=m
+CONFIG_DRM_XE_FORCE_PROBE="*"
 CONFIG_DRM_UDL=m
 CONFIG_DRM_PANEL_LVDS=m
 CONFIG_DRM_PANEL_ILITEK_ILI9806E=m

drivers/gpu/drm/ttm/ttm_bo_util.c

@@ -359,7 +359,8 @@ static int ttm_bo_kmap_ttm(struct ttm_buffer_object *bo,
 	if (ret)
 		return ret;
 
-	if (num_pages == 1 && ttm->caching == ttm_cached &&
+	if (!IS_ENABLED(CONFIG_ARM64) &&
+	    num_pages == 1 && ttm->caching == ttm_cached &&
 	    !(man->use_tt && (ttm->page_flags & TTM_TT_FLAG_DECRYPTED))) {
 		/*
 		 * We're mapping a single page, and the desired

drivers/gpu/drm/ttm/ttm_module.c

@@ -63,7 +63,11 @@ pgprot_t ttm_prot_from_caching(enum ttm_caching caching, pgprot_t tmp)
 {
 	/* Cached mappings need no adjustment */
 	if (caching == ttm_cached)
+#ifdef CONFIG_ARM64
+		return pgprot_dmacoherent(tmp);
+#else
 		return tmp;
+#endif
 
 #if defined(__i386__) || defined(__x86_64__)
 	if (caching == ttm_write_combined)