[PATCH v4 08/10] drm/arm/malidp:- Use the newly introduced malidp_format_get_bpp() instead of relying on cpp for calculating framebuffer size

[Ayan Halder <Ayan.Halder@arm.com>]

From: Ayan Kumar Halder <ayan.halder@arm.com>

Formats like DRM_FORMAT_VUY101010, DRM_FORMAT_YUV420_8BIT and
DRM_FORMAT_YUV420_10BIT are expressed in bits per pixel as they have a non
integer value of cpp (thus denoted as '0' in drm_format_info[]). Therefore,
the calculation of AFBC framebuffer size needs to use malidp_format_get_bpp().

Changes since v3 (series):
- Added the ack
- Rebased on the latest drm-misc-next

Signed-off-by: Ayan Kumar halder <ayan.halder@arm.com>
Reviewed-by: Liviu Dudau <liviu.dudau@arm.com>
Acked-by: Alyssa Rosenzweig <alyssa@rosenzweig.io>
---
 drivers/gpu/drm/arm/malidp_drv.c | 15 ++++++++++-----
 1 file changed, 10 insertions(+), 5 deletions(-)

diff --git a/drivers/gpu/drm/arm/malidp_drv.c b/drivers/gpu/drm/arm/malidp_drv.c
index c697664..4106f5d 100644
--- a/drivers/gpu/drm/arm/malidp_drv.c
+++ b/drivers/gpu/drm/arm/malidp_drv.c
@@ -298,6 +298,7 @@ malidp_verify_afbc_framebuffer_size(struct drm_device *dev,
 	struct drm_gem_object *objs = NULL;
 	u32 afbc_superblock_size = 0, afbc_superblock_height = 0;
 	u32 afbc_superblock_width = 0, afbc_size = 0;
+	int bpp = 0;
 
 	switch (mode_cmd->modifier[0] & AFBC_SIZE_MASK) {
 	case AFBC_SIZE_16X16:
@@ -314,15 +315,19 @@ malidp_verify_afbc_framebuffer_size(struct drm_device *dev,
 	n_superblocks = (mode_cmd->width / afbc_superblock_width) *
 		(mode_cmd->height / afbc_superblock_height);
 
-	afbc_superblock_size = info->cpp[0] * afbc_superblock_width *
-		afbc_superblock_height;
+	bpp = malidp_format_get_bpp(info->format);
+
+	afbc_superblock_size = (bpp * afbc_superblock_width * afbc_superblock_height)
+				/ BITS_PER_BYTE;
 
 	afbc_size = ALIGN(n_superblocks * AFBC_HEADER_SIZE, AFBC_SUPERBLK_ALIGNMENT);
 	afbc_size += n_superblocks * ALIGN(afbc_superblock_size, AFBC_SUPERBLK_ALIGNMENT);
 
-	if (mode_cmd->width * info->cpp[0] != mode_cmd->pitches[0]) {
-		DRM_DEBUG_KMS("Invalid value of pitch (=%u) should be same as width (=%u) * cpp (=%u)\n",
-			      mode_cmd->pitches[0], mode_cmd->width, info->cpp[0]);
+	if ((mode_cmd->width * bpp) != (mode_cmd->pitches[0] * BITS_PER_BYTE)) {
+		DRM_DEBUG_KMS("Invalid value of (pitch * BITS_PER_BYTE) (=%u) "
+			      "should be same as width (=%u) * bpp (=%u)\n",
+			      (mode_cmd->pitches[0] * BITS_PER_BYTE),
+			      mode_cmd->width, bpp);
 		return false;
 	}
 
-- 
2.7.4