msm: mdss: Expose bandwidth compression capability to user

The userspace needs to be aware of the presence of bandwidth
compression use case which is a new hardware feature

Change-Id: I02ec320a2ab9add78000df0459c8095c8f8505fb
Signed-off-by: Sree Sesha Aravind Vadrevu <svadrevu@codeaurora.org>

5 files changed, 28 insertions, 6 deletions

diff --git a/Documentation/devicetree/bindings/fb/mdss-mdp.txt b/Documentation/devicetree/bindings/fb/mdss-mdp.txt
index 0422b57708e6..3bd8caa80e4f 100644
--- a/Documentation/devicetree/bindings/fb/mdss-mdp.txt
+++ b/Documentation/devicetree/bindings/fb/mdss-mdp.txt
@@ -108,7 +108,8 @@ Optional properties:
 - qcom,mdss-rot-block-size:	The size of a memory block (in pixels) to be used
 				by the rotator. If this property is not specified,
 				then a default value of 128 pixels would be used.
-
+- qcom,mdss-has-bwc: Boolean property to indicate the presence of bandwidth
+		      compression feature in the rotator.
 Optional subnodes:
 Child nodes representing the frame buffer virtual devices.
 
@@ -141,7 +142,7 @@ Example:
 		qcom,mdss-pipe-dma-fetch-id = <10 13>;
 		qcom,mdss-smp-data = <22 4096>;
 		qcom,mdss-rot-block-size = <64>;
-
+		qcom,mdss-has-bwc;
 		qcom,mdss-ctl-off = <0x00000600 0x00000700 0x00000800
 				     0x00000900 0x0000A00>;
 		qcom,mdss-mixer-intf-off = <0x00003200 0x00003600
diff --git a/drivers/video/fbdev/msm/mdss.h b/drivers/video/fbdev/msm/mdss.h
index bc2c509cf07d..1a34c6e558ea 100644
--- a/drivers/video/fbdev/msm/mdss.h
+++ b/drivers/video/fbdev/msm/mdss.h
@@ -73,7 +73,7 @@ struct mdss_data_type {
 	u32 irq_mask;
 	u32 irq_ena;
 	u32 irq_buzy;
-
+	u32 has_bwc;
 	u32 mdp_irq_mask;
 	u32 mdp_hist_irq_mask;
 
diff --git a/drivers/video/fbdev/msm/mdss_mdp.c b/drivers/video/fbdev/msm/mdss_mdp.c
index fb4c34aa3afa..783a8edf5fa2 100644
--- a/drivers/video/fbdev/msm/mdss_mdp.c
+++ b/drivers/video/fbdev/msm/mdss_mdp.c
@@ -1510,6 +1510,8 @@ static int mdss_mdp_parse_dt_misc(struct platform_device *pdev)
 		&data);
 	mdata->rot_block_size = (!rc ? data : 128);
 
+	mdata->has_bwc = of_property_read_bool(pdev->dev.of_node,
+					       "qcom,mdss-has-bwc");
 	return 0;
 }
 
diff --git a/drivers/video/fbdev/msm/mdss_mdp_overlay.c b/drivers/video/fbdev/msm/mdss_mdp_overlay.c
index 3cce4f9c15d3..718af09b04de 100644
--- a/drivers/video/fbdev/msm/mdss_mdp_overlay.c
+++ b/drivers/video/fbdev/msm/mdss_mdp_overlay.c
@@ -176,6 +176,7 @@ static int mdss_mdp_overlay_rotator_setup(struct msm_fb_data_type *mfd,
 	struct mdss_mdp_rotator_session *rot;
 	struct mdss_mdp_format_params *fmt;
 	int ret = 0;
+	u32 bwc_enabled;
 
 	pr_debug("rot ctl=%u req id=%x\n", mdp5_data->ctl->num, req->id);
 
@@ -212,7 +213,14 @@ static int mdss_mdp_overlay_rotator_setup(struct msm_fb_data_type *mfd,
 	rot->flags = req->flags & (MDP_ROT_90 | MDP_FLIP_LR | MDP_FLIP_UD |
 				   MDP_SECURE_OVERLAY_SESSION);
 
-	rot->bwc_mode = (req->flags & MDP_BWC_EN) ? 1 : 0;
+	bwc_enabled = req->flags & MDP_BWC_EN;
+	if (bwc_enabled  &&  !mdp5_data->mdata->has_bwc) {
+		pr_err("BWC is not supported in MDP version %x\n",
+			mdp5_data->mdata->mdp_rev);
+		rot->bwc_mode = 0;
+	} else {
+		rot->bwc_mode = bwc_enabled ? 1 : 0;
+	}
 	rot->format = fmt->format;
 	rot->img_width = req->src.width;
 	rot->img_height = req->src.height;
@@ -248,6 +256,7 @@ static int mdss_mdp_overlay_pipe_setup(struct msm_fb_data_type *mfd,
 	struct mdss_overlay_private *mdp5_data = mfd_to_mdp5_data(mfd);
 	struct mdp_histogram_start_req hist;
 	int ret;
+	u32 bwc_enabled;
 
 	if (mdp5_data->ctl == NULL)
 		return -ENODEV;
@@ -356,8 +365,15 @@ static int mdss_mdp_overlay_pipe_setup(struct msm_fb_data_type *mfd,
 	}
 
 	pipe->flags = req->flags;
-	pipe->bwc_mode = pipe->mixer->rotator_mode ?
-		0 : (req->flags & MDP_BWC_EN ? 1 : 0) ;
+	bwc_enabled = req->flags & MDP_BWC_EN;
+	if (bwc_enabled  &&  !mdp5_data->mdata->has_bwc) {
+		pr_err("BWC is not supported in MDP version %x\n",
+			mdp5_data->mdata->mdp_rev);
+		pipe->bwc_mode = 0;
+	} else {
+		pipe->bwc_mode = pipe->mixer->rotator_mode ?
+			0 : (bwc_enabled ? 1 : 0) ;
+	}
 	pipe->img_width = req->src.width & 0x3fff;
 	pipe->img_height = req->src.height & 0x3fff;
 	pipe->src.x = req->src_rect.x;
@@ -1562,6 +1578,8 @@ static int mdss_fb_get_hw_caps(struct msm_fb_data_type *mfd,
 	caps->vig_pipes = mdata->nvig_pipes;
 	caps->rgb_pipes = mdata->nrgb_pipes;
 	caps->dma_pipes = mdata->ndma_pipes;
+	if (mdata->has_bwc)
+		caps->features |= MDP_BWC_EN;
 	return 0;
 }
 
diff --git a/include/uapi/linux/msm_mdp.h b/include/uapi/linux/msm_mdp.h
index 00e7d771d1a1..5a767754a114 100644
--- a/include/uapi/linux/msm_mdp.h
+++ b/include/uapi/linux/msm_mdp.h
@@ -686,6 +686,7 @@ struct mdss_hw_caps {
 	uint8_t rgb_pipes;
 	uint8_t vig_pipes;
 	uint8_t dma_pipes;
+	uint32_t features;
 };
 
 struct msmfb_metadata {