msm: mdss: add support for RT/NRT traffic

RT/NRT feature splits the AXI traffic over two AXI ports.
By diverting RT/NRT traffic to individual AXI ports, NRT
traffic can be throttled by NOC at SoC level based on AXI
port#. Having this capability can help tweak QoS based on
use-cases.
This change adds support to identify real time and
non-real time clients and acocrdingly program HW to take
care of routing the RT/NRT traffic to respective AXI ports.

Change-Id: Ic5d94423f125226539db9e21bc095dba803cc63e
Signed-off-by: Radhika Ranjan Soni <rrsoni@codeaurora.org>

Documentation/devicetree/bindings/fb/mdss-mdp.txt

@@ -238,6 +238,11 @@ Optional properties:
 				pipes which have no scaling support.
 - qcom,mdss-has-decimation: Boolean property to indicate the presence of
 			    decimation feature in fetch.
+- qcom,mdss-has-fixed-qos-arbiter-enabled: Boolean property to indicate the
+			    presence of rt/nrt feature. This feature enables
+			    increased performance by prioritizing the real time
+			    (rt) traffic over non real time (nrt) traffic to
+			    access the memory.
 - qcom,mdss-has-source-split: Boolean property to indicate if source split
 			      feature is available or not.
 - qcom,mdss-ad-off:		Array of offset addresses for the available
@@ -467,6 +472,7 @@ Example:
 		qcom,mdss-has-non-scalar-rgb;
 		qcom,mdss-has-bwc;
 		qcom,mdss-has-decimation;
+		qcom,mdss-has-fixed-qos-arbiter-enabled;
 		qcom,mdss-has-source-split;
 		qcom,mdss-wfd-mode = "intf";
 		qcom,mdss-no-lut-read;

drivers/video/fbdev/msm/mdss.h

@@ -122,6 +122,7 @@ struct mdss_data_type {
 	u32 irq_buzy;
 	u32 has_bwc;
 	u32 has_decimation;
+	bool has_fixed_qos_arbiter_enabled;
 	bool has_panic_ctrl;
 	u32 wfd_mode;
 	u32 has_no_lut_read;

drivers/video/fbdev/msm/mdss_mdp.c

@@ -2462,6 +2462,9 @@ static int mdss_mdp_parse_dt_misc(struct platform_device *pdev)
 
 	mdata->has_src_split = of_property_read_bool(pdev->dev.of_node,
 		 "qcom,mdss-has-source-split");
+	mdata->has_fixed_qos_arbiter_enabled =
+			of_property_read_bool(pdev->dev.of_node,
+		 "qcom,mdss-has-fixed-qos-arbiter-enabled");
 	mdata->idle_pc_enabled = of_property_read_bool(pdev->dev.of_node,
 		 "qcom,mdss-idle-power-collapse-enabled");
 

drivers/video/fbdev/msm/mdss_mdp_hwio.h

@@ -614,4 +614,7 @@ enum mdss_mdp_pingpong_index {
 
 #define MDSS_VBIF_QOS_REMAP_BASE	0x020
 #define MDSS_VBIF_QOS_REMAP_ENTRIES	0x4
+
+#define MDSS_VBIF_FIXED_SORT_EN	0x30
+#define MDSS_VBIF_FIXED_SORT_SEL0	0x34
 #endif

drivers/video/fbdev/msm/mdss_mdp_pipe.c

@@ -567,6 +567,42 @@ static void mdss_mdp_qos_vbif_remapper_setup(struct mdss_data_type *mdata,
 	mdss_mdp_clk_ctrl(MDP_BLOCK_POWER_OFF, false);
 }
 
+/**
+ * mdss_mdp_fixed_qos_arbiter_setup - Program the RT/NRT registers based on
+ *              real or non real time clients
+ * @mdata:      Pointer to the global mdss data structure.
+ * @pipe:       Pointer to source pipe struct to get xin id's.
+ * @is_realtime:        To determine if pipe's client is real or
+ *                      non real time.
+ */
+static void mdss_mdp_fixed_qos_arbiter_setup(struct mdss_data_type *mdata,
+		struct mdss_mdp_pipe *pipe, bool is_realtime)
+{
+	u32 mask, reg_val;
+
+	if (!mdata->has_fixed_qos_arbiter_enabled)
+		return;
+
+	mdss_mdp_clk_ctrl(MDP_BLOCK_POWER_ON, false);
+	mutex_lock(&mdata->reg_lock);
+	reg_val = readl_relaxed(mdata->vbif_base + MDSS_VBIF_FIXED_SORT_EN);
+	mask = 0x1 << pipe->xin_id;
+	reg_val |= mask;
+
+	/* Enable the fixed sort for the client */
+	writel_relaxed(reg_val, mdata->vbif_base + MDSS_VBIF_FIXED_SORT_EN);
+	reg_val = readl_relaxed(mdata->vbif_base + MDSS_VBIF_FIXED_SORT_SEL0);
+	mask = 0x1 << (pipe->xin_id * 2);
+	if (is_realtime)
+		reg_val &= ~mask;
+	else
+		reg_val |= mask;
+	/* Set the fixed_sort regs as per RT/NRT client */
+	writel_relaxed(reg_val, mdata->vbif_base + MDSS_VBIF_FIXED_SORT_SEL0);
+	mutex_unlock(&mdata->reg_lock);
+	mdss_mdp_clk_ctrl(MDP_BLOCK_POWER_OFF, false);
+}
+
 static struct mdss_mdp_pipe *mdss_mdp_pipe_init(struct mdss_mdp_mixer *mixer,
 	u32 type, u32 off, struct mdss_mdp_pipe *left_blend_pipe)
 {
@@ -657,6 +693,7 @@ static struct mdss_mdp_pipe *mdss_mdp_pipe_init(struct mdss_mdp_mixer *mixer,
 		is_realtime = !((mixer->ctl->intf_num == MDSS_MDP_NO_INTF)
 				|| mixer->rotator_mode);
 		mdss_mdp_qos_vbif_remapper_setup(mdata, pipe, is_realtime);
+		mdss_mdp_fixed_qos_arbiter_setup(mdata, pipe, is_realtime);
 	} else if (pipe_share) {
 		/*
 		 * when there is no dedicated wfd blk, DMA pipe can be