[PATCH 5/8] drm: rcar-du: Implement interfaces to set clu and lut using drm data structures

[VenkataRajesh.Kalakodima]

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

Impelement interfaces in cmm to set clu and lut tables using standard
drm data structures as input.

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

      - 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  | 256 +++++++++++++++++++++++++++++++--
 drivers/gpu/drm/rcar-du/rcar_du_crtc.h |  11 ++
 2 files changed, 254 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 7983039..af4668f 100644
--- a/drivers/gpu/drm/rcar-du/rcar_du_cmm.c
+++ b/drivers/gpu/drm/rcar-du/rcar_du_cmm.c
@@ -114,6 +114,8 @@ struct rcar_du_cmm_pending_event {
 	struct drm_gem_object *gem_obj;
 	struct rcar_du_cmm *du_cmm;
 	struct rcar_du_cmm_file_priv *fpriv;
+	unsigned int *lut_buf;
+	unsigned int *clu_buf;
 };
 
 struct cmm_module_t {
@@ -238,14 +240,6 @@ static long long diff_timevals(struct timeval *start, struct timeval *end)
 }
 #endif
 
-static void du_cmm_clk(struct rcar_du_cmm *du_cmm, bool on)
-{
-	if (on)
-		clk_prepare_enable(du_cmm->clock);
-	else
-		clk_disable_unprepare(du_cmm->clock);
-}
-
 static void rcar_du_cmm_queue_lut_update(struct rcar_du_cmm_pending_event *p)
 {
 	mutex_lock(&cmm_event_lock);
@@ -284,6 +278,223 @@ static void rcar_du_cmm_queue_clu_update(struct rcar_du_cmm_pending_event *p)
 	drm_crtc_vblank_get(&p->du_cmm->rcrtc->crtc);
 }
 
+static s64 rcar_du_cmm_multiply_coeff(unsigned int color, s64 coeff)
+{
+	s64 r_val;
+	bool is_neg = false;
+
+	if (coeff & BIT_ULL(63)) {
+		is_neg = true;
+		coeff &= ~BIT_ULL(63);
+	}
+
+	r_val = DIV_ROUND_CLOSEST(((s64)(color * coeff)), BIT_ULL(32));
+
+	if (is_neg)
+		return -r_val;
+
+	return r_val;
+}
+
+static unsigned int rcar_du_cmm_scalar_product(unsigned int r, unsigned int g,
+					       unsigned int b, s64 coeff1,
+					       s64 coeff2, s64 coeff3)
+{
+	s64 product;
+
+	product = rcar_du_cmm_multiply_coeff(r, coeff1)
+			+ rcar_du_cmm_multiply_coeff(g, coeff2)
+			+ rcar_du_cmm_multiply_coeff(b, coeff3);
+
+	return (unsigned int)clamp_val(product, 0, U8_MAX);
+}
+
+#ifdef DEBUG_PROCE_TIME
+static long long diff_timevals(struct timeval *start, struct timeval *end)
+{
+	return (end->tv_sec * 1000000LL + end->tv_usec) -
+		(start->tv_sec * 1000000LL + start->tv_usec);
+}
+#endif
+
+void *rcar_du_cmm_alloc_lut(void *cmm_handle)
+{
+	struct rcar_du_cmm_pending_event *p;
+
+	if (!cmm_handle)
+		return NULL;
+
+	p = kzalloc(sizeof(*p), GFP_KERNEL);
+	if (!p)
+		return NULL;
+
+	p->gem_obj = NULL;
+	p->event = CMM_EVENT_LUT_DONE;
+	p->stat = QUE_STAT_PENDING;
+	p->callback_data = 0;
+	p->du_cmm = cmm_handle;
+	p->fpriv = NULL;
+	p->lut_buf = kmalloc(CMM_LUT_NUM * 4, GFP_KERNEL);
+	if (!p->lut_buf) {
+		kfree(p);
+		return NULL;
+	}
+
+	return p;
+}
+
+void rcar_du_cmm_free_lut(void *lut_handle)
+{
+	struct rcar_du_cmm_pending_event *p =
+			(struct rcar_du_cmm_pending_event *)lut_handle;
+
+	kfree(p->lut_buf);
+	kfree(p);
+}
+
+int rcar_du_cmm_lut_valid(unsigned int lut_length)
+{
+	return (lut_length == CMM_LUT_NUM) ? 0 : -EINVAL;
+}
+
+void rcar_du_cmm_update_lut_and_free(void *lut_handle,
+				     struct drm_color_lut *lut,
+				     unsigned int lut_length)
+{
+	struct rcar_du_cmm_pending_event *p =
+			(struct rcar_du_cmm_pending_event *)lut_handle;
+	unsigned int color;
+
+	if (!p)
+		return;
+
+	if (rcar_du_cmm_lut_valid(lut_length))
+		return;
+
+	/* Convert drm_color_lut to the format handled by hardware */
+	for (color = 0; color < lut_length; color++) {
+		p->lut_buf[color] = 0;
+		p->lut_buf[color] |= drm_color_lut_extract(lut[color].red, 8)
+					<< 16;
+		p->lut_buf[color] |= drm_color_lut_extract(lut[color].green, 8)
+					<< 8;
+		p->lut_buf[color] |= drm_color_lut_extract(lut[color].blue, 8);
+	}
+	rcar_du_cmm_queue_lut_update(p);
+}
+
+void *rcar_du_cmm_alloc_clu(void *cmm_handle)
+{
+	struct rcar_du_cmm_pending_event *p;
+
+	if (!cmm_handle)
+		return NULL;
+
+	p = kzalloc(sizeof(*p), GFP_KERNEL);
+	if (!p)
+		return NULL;
+
+	p->gem_obj = NULL;
+	p->event = CMM_EVENT_CLU_DONE;
+	p->stat = QUE_STAT_PENDING;
+	p->callback_data = 0;
+	p->du_cmm = cmm_handle;
+	p->fpriv = NULL;
+	p->clu_buf = kmalloc(CMM_CLU_NUM * 4, GFP_KERNEL);
+	if (!p->clu_buf) {
+		kfree(p);
+		return NULL;
+	}
+
+	return p;
+}
+
+void rcar_du_cmm_free_clu(void *clu_handle)
+{
+	struct rcar_du_cmm_pending_event *p =
+			(struct rcar_du_cmm_pending_event *)clu_handle;
+
+	kfree(p->clu_buf);
+	kfree(p);
+}
+
+void rcar_du_cmm_update_clu_and_free(void *clu_handle,
+				     struct drm_color_ctm *ctm)
+{
+	struct rcar_du_cmm_pending_event *p =
+			(struct rcar_du_cmm_pending_event *)clu_handle;
+	unsigned int r_loop;
+	unsigned int g_loop;
+	unsigned int b_loop;
+	unsigned int step_size;
+	unsigned int step_fraction;
+	unsigned int clu_index = 0;
+
+	if (!p)
+		return;
+
+	step_size = U8_MAX / (CMM_CLU_SAMPLES - 1);
+	step_fraction = U8_MAX % (CMM_CLU_SAMPLES - 1);
+
+	/*Update clu table*/
+	for (b_loop = 0; b_loop < CMM_CLU_SAMPLES; b_loop++) {
+		unsigned int b;
+
+		b = (b_loop * step_size) +
+		    DIV_ROUND_CLOSEST((b_loop * step_fraction),
+				      (CMM_CLU_SAMPLES - 1));
+
+		for (g_loop = 0; g_loop < CMM_CLU_SAMPLES; g_loop++) {
+			unsigned int g;
+
+			g = (g_loop * step_size) +
+			    DIV_ROUND_CLOSEST((g_loop * step_fraction),
+					      (CMM_CLU_SAMPLES - 1));
+
+			for (r_loop = 0; r_loop < CMM_CLU_SAMPLES; r_loop++) {
+				unsigned int r;
+				unsigned int r_val;
+				unsigned int g_val;
+				unsigned int b_val;
+
+				r = (r_loop * step_size) +
+				    DIV_ROUND_CLOSEST((r_loop * step_fraction),
+						      (CMM_CLU_SAMPLES - 1));
+
+				p->clu_buf[clu_index] = 0;
+
+				r_val =	rcar_du_cmm_scalar_product
+						(r, g, b,
+						 ctm->matrix[0], ctm->matrix[1],
+						 ctm->matrix[2]);
+
+				g_val =	rcar_du_cmm_scalar_product
+						(r, g, b,
+						 ctm->matrix[3], ctm->matrix[4],
+						 ctm->matrix[5]);
+
+				b_val =	rcar_du_cmm_scalar_product
+						(r, g, b,
+						 ctm->matrix[6], ctm->matrix[7],
+						 ctm->matrix[8]);
+
+				p->clu_buf[clu_index++] = (r_val << 16) |
+							  (g_val << 8) | b_val;
+			}
+		}
+	}
+
+	rcar_du_cmm_queue_clu_update(p);
+}
+
+static void du_cmm_clk(struct rcar_du_cmm *du_cmm, bool on)
+{
+	if (on)
+		clk_prepare_enable(du_cmm->clock);
+	else
+		clk_disable_unprepare(du_cmm->clock);
+}
+
 int rcar_du_cmm_start_stop(struct rcar_du_crtc *rcrtc, bool on)
 {
 	struct rcar_du_cmm *du_cmm = rcrtc->cmm_handle;
@@ -424,8 +635,16 @@ static inline void _event_done_locked(struct rcar_du_cmm_pending_event *p)
 		list_add_tail(&p->link, cmm_done_list(p->du_cmm, p->fpriv));
 		wake_up_interruptible(&p->fpriv->event_wait);
 	} else {
-		/* link deleted by rcar_du_cmm_postclose */
-		kfree(p);
+		/* link deleted by rcar_du_cmm_postclose
+		 * OR it could also be due to set of ctm and gamma
+		 * properties through drm APIs.
+		 */
+		if (p->event == CMM_EVENT_LUT_DONE)
+			rcar_du_cmm_free_lut(p);
+		else if (p->event == CMM_EVENT_CLU_DONE)
+			rcar_du_cmm_free_clu(p);
+		else
+			kfree(p);
 	}
 }
 
@@ -479,7 +698,8 @@ event_pop_locked(struct cmm_module_t *module)
 
 	p->stat = QUE_STAT_ACTIVE;
 	list_del(&p->link); /* delete from du_cmm->[lut|clu|hgo].list */
-	list_add_tail(&p->link, &p->fpriv->active_list);
+	if (p->fpriv)
+		list_add_tail(&p->link, &p->fpriv->active_list);
 	cmm_vblank_put(p);
 
 	return p;
@@ -605,7 +825,11 @@ static int lut_set(struct rcar_du_cmm *du_cmm,
 		return -EINVAL;
 	}
 
-	lut_buf = gem_to_vaddr(stat->p->gem_obj);
+	if (stat->p->gem_obj)
+		lut_buf = gem_to_vaddr(stat->p->gem_obj);
+	else
+		lut_buf = stat->p->lut_buf;
+
 	for (i = 0; i < CMM_LUT_NUM; i++)
 		rcar_du_cmm_write(du_cmm, lut_base + i * 4, lut_buf[i]);
 
@@ -723,7 +947,11 @@ static int clu_set(struct rcar_du_cmm *du_cmm,
 		return -EINVAL;
 	}
 
-	clu_buf = gem_to_vaddr(stat->p->gem_obj);
+	if (stat->p->gem_obj)
+		clu_buf = gem_to_vaddr(stat->p->gem_obj);
+	else
+		clu_buf = stat->p->clu_buf;
+
 	rcar_du_cmm_write(du_cmm, addr_reg, 0);
 	for (i = 0; i < CMM_CLU_NUM; i++)
 		rcar_du_cmm_write(du_cmm, data_reg, clu_buf[i]);
@@ -1222,6 +1450,8 @@ int rcar_du_cmm_init(struct rcar_du_crtc *rcrtc)
 
 	rcrtc->cmm_handle = du_cmm;
 
+	drm_crtc_enable_color_mgmt(&rcrtc->crtc, 0, true, CMM_LUT_NUM);
+
 	dev_info(rcdu->dev, "DU%d use CMM(%s buffer)\n",
 		 rcrtc->index, du_cmm->dbuf ? "Double" : "Single");
 
diff --git a/drivers/gpu/drm/rcar-du/rcar_du_crtc.h b/drivers/gpu/drm/rcar-du/rcar_du_crtc.h
index 74e0a22..5b85de4 100644
--- a/drivers/gpu/drm/rcar-du/rcar_du_crtc.h
+++ b/drivers/gpu/drm/rcar-du/rcar_du_crtc.h
@@ -115,6 +115,17 @@ void rcar_du_cmm_postclose(struct drm_device *dev, struct drm_file *file_priv);
 int rcar_du_cmm_start_stop(struct rcar_du_crtc *rcrtc, bool on);
 void rcar_du_cmm_kick(struct rcar_du_crtc *rcrtc);
 
+void *rcar_du_cmm_alloc_lut(void *cmm_handle);
+void rcar_du_cmm_free_lut(void *lut_handle);
+int rcar_du_cmm_lut_valid(unsigned int lut_length);
+void rcar_du_cmm_update_lut_and_free(void *lut_handle,
+				     struct drm_color_lut *lut,
+				     unsigned int lut_length);
+
+void *rcar_du_cmm_alloc_clu(void *cmm_handle);
+void rcar_du_cmm_free_clu(void *clu_handle);
+void rcar_du_cmm_update_clu_and_free(void *clu_handle,
+				     struct drm_color_ctm *ctm);
 #ifdef CONFIG_PM_SLEEP
 int rcar_du_cmm_pm_suspend(struct rcar_du_crtc *rcrtc);
 int rcar_du_cmm_pm_resume(struct rcar_du_crtc *rcrtc);
-- 
2.7.4