[PATCH 3/8] drm: rcar-du: Give a name to clu table samples

[<VenkataRajesh.Kalakodima@xxxxxxxxxxxx>]

From: kalakodima venkata rajesh <venkatarajesh.kalakodima@xxxxxxxxxxxx>

Replace the hardcoded value of clu table sample count with a
meaningful name.

Signed-off-by: Harsha M M <harsha.manjulamallikarjun@xxxxxxxxxxxx>

This is the out-of-tree patch for DU CMM driver support from
    Yocto release v3.6.0. The part of this patch adding CMM support to
    the new Rcar E3 (R8A77990) SoC was filtered out due to lack of
    Yocto v3.6.0 (i.e. rcar-3.6.2) kernel updates on staging-414.

    Link: https://github.com/renesas-rcar/du_cmm/commit/53973b806881ed8f54500b0d42bdc40aaca60476.patch

    Following is from the patch description:

    Subject: [PATCH] du_cmm: Release for Yocto v3.6.0

    This patch made the following correspondence.

      - R-Car E3(R8A77990) device support.
      - Fix rewritting of parameter procedure in rcar_du_cmm_postclose

Signed-off-by: Eugeniu Rosca <erosca@xxxxxxxxxxxxxx>

      - Resolved checkpatch errors
      - Resolved merge conflicts according to latest version

Signed-off-by: kalakodima venkata rajesh <venkatarajesh.kalakodima@xxxxxxxxxxxx>
---
 drivers/gpu/drm/rcar-du/rcar_du_cmm.c | 28 +++++++++++++++-------------
 1 file changed, 15 insertions(+), 13 deletions(-)

diff --git a/drivers/gpu/drm/rcar-du/rcar_du_cmm.c b/drivers/gpu/drm/rcar-du/rcar_du_cmm.c
index ac613a6e..d380dd9 100644
--- a/drivers/gpu/drm/rcar-du/rcar_du_cmm.c
+++ b/drivers/gpu/drm/rcar-du/rcar_du_cmm.c
@@ -75,9 +75,9 @@
 #include <linux/clk.h>
 
 /* #define DEBUG_PROCE_TIME 1 */
-
+#define CMM_CLU_SAMPLES 17
 #define CMM_LUT_NUM 256
-#define CMM_CLU_NUM (17 * 17 * 17)
+#define CMM_CLU_NUM (CMM_CLU_SAMPLES * CMM_CLU_SAMPLES * CMM_CLU_SAMPLES)
 #define CMM_HGO_NUM 64
 /* rcar_du_drm.h Include */
 #define LUT_DOUBLE_BUFFER_AUTO		0
@@ -211,11 +211,11 @@ static inline u32 index_to_clu_data(int index)
 {
 	int r, g, b;
 
-	r = index % 17;
-	index /= 17;
-	g = index % 17;
-	index /= 17;
-	b = index % 17;
+	r = index % CMM_CLU_SAMPLES;
+	index /= CMM_CLU_SAMPLES;
+	g = index % CMM_CLU_SAMPLES;
+	index /= CMM_CLU_SAMPLES;
+	b = index % CMM_CLU_SAMPLES;
 
 	r = (r << 20);
 	if (r > (255 << 16))
@@ -630,9 +630,9 @@ static int clu_table_copy(struct rcar_du_cmm *du_cmm)
 	}
 
 	rcar_du_cmm_write(du_cmm, dst_addr, 0);
-	for (i = 0; i < 17; i++) {
-		for (j = 0; j < 17; j++) {
-			for (k = 0; k < 17; k++) {
+	for (i = 0; i < CMM_CLU_SAMPLES; i++) {
+		for (j = 0; j < CMM_CLU_SAMPLES; j++) {
+			for (k = 0; k < CMM_CLU_SAMPLES; k++) {
 				rcar_du_cmm_write(du_cmm, src_addr,
 						  (k << 16) | (j << 8) |
 						  (i << 0));
@@ -912,9 +912,9 @@ int rcar_du_cmm_pm_suspend(struct rcar_du_crtc *rcrtc)
 	}
 
 	index = 0;
-	for (i = 0; i < 17; i++) {
-		for (j = 0; j < 17; j++) {
-			for (k = 0; k < 17; k++) {
+	for (i = 0; i < CMM_CLU_SAMPLES; i++) {
+		for (j = 0; j < CMM_CLU_SAMPLES; j++) {
+			for (k = 0; k < CMM_CLU_SAMPLES; k++) {
 				rcar_du_cmm_write(du_cmm, CMM_CLU_ADDR,
 						  (k << 16) | (j << 8) |
 						  (i << 0));
@@ -1014,6 +1014,8 @@ void rcar_du_cmm_postclose(struct drm_device *dev, struct drm_file *file_priv)
 	for (crtcs_cnt = 0; crtcs_cnt < rcdu->num_crtcs; crtcs_cnt++) {
 		rcrtc = &rcdu->crtcs[crtcs_cnt];
 		du_cmm = rcrtc->cmm_handle;
+		if (!du_cmm)
+			continue;
 		if (du_cmm->authority && du_cmm->pid == task_pid_nr(current)) {
 			du_cmm->authority = false;
 			du_cmm->pid = 0;
-- 
2.7.4