drm/msm/dsi: Update source PLL selection in DSI PHY

The source PLL to be used by each DSI PHY should be decided by
DSI manager based on dual DSI information, while the register
programming to select PLL is different from one type of PHY to
another. This change adds the H/W difference to PHY configuration
and updates the interface between DSI manager and PHY.

With this change, PLL selection can be supported on different
targets.

Signed-off-by: Hai Li <hali@codeaurora.org>
Signed-off-by: Rob Clark <robdclark@gmail.com>

drivers/gpu/drm/msm/dsi/dsi.h

@@ -27,18 +27,6 @@
 #define DSI_1	1
 #define DSI_MAX	2
 
-#define DSI_CLOCK_MASTER	DSI_0
-#define DSI_CLOCK_SLAVE		DSI_1
-
-#define DSI_LEFT		DSI_0
-#define DSI_RIGHT		DSI_1
-
-/* According to the current drm framework sequence, take the encoder of
- * DSI_1 as master encoder
- */
-#define DSI_ENCODER_MASTER	DSI_1
-#define DSI_ENCODER_SLAVE	DSI_0
-
 enum msm_dsi_phy_type {
 	MSM_DSI_PHY_28NM_HPM,
 	MSM_DSI_PHY_28NM_LP,
@@ -153,7 +141,7 @@ int msm_dsi_host_init(struct msm_dsi *msm_dsi);
 struct msm_dsi_phy;
 void msm_dsi_phy_driver_register(void);
 void msm_dsi_phy_driver_unregister(void);
-int msm_dsi_phy_enable(struct msm_dsi_phy *phy, bool is_dual_panel,
+int msm_dsi_phy_enable(struct msm_dsi_phy *phy, int src_pll_id,
 	const unsigned long bit_rate, const unsigned long esc_rate);
 int msm_dsi_phy_disable(struct msm_dsi_phy *phy);
 void msm_dsi_phy_get_clk_pre_post(struct msm_dsi_phy *phy,

drivers/gpu/drm/msm/dsi/dsi_manager.c

@@ -14,6 +14,18 @@
 #include "msm_kms.h"
 #include "dsi.h"
 
+#define DSI_CLOCK_MASTER	DSI_0
+#define DSI_CLOCK_SLAVE		DSI_1
+
+#define DSI_LEFT		DSI_0
+#define DSI_RIGHT		DSI_1
+
+/* According to the current drm framework sequence, take the encoder of
+ * DSI_1 as master encoder
+ */
+#define DSI_ENCODER_MASTER	DSI_1
+#define DSI_ENCODER_SLAVE	DSI_0
+
 struct msm_dsi_manager {
 	struct msm_dsi *dsi[DSI_MAX];
 
@@ -598,9 +610,10 @@ int msm_dsi_manager_phy_enable(int id,
 {
 	struct msm_dsi *msm_dsi = dsi_mgr_get_dsi(id);
 	struct msm_dsi_phy *phy = msm_dsi->phy;
+	int src_pll_id = IS_DUAL_PANEL() ? DSI_CLOCK_MASTER : id;
 	int ret;
 
-	ret = msm_dsi_phy_enable(phy, IS_DUAL_PANEL(), bit_rate, esc_rate);
+	ret = msm_dsi_phy_enable(phy, src_pll_id, bit_rate, esc_rate);
 	if (ret)
 		return ret;
 

drivers/gpu/drm/msm/dsi/dsi_phy.c

@@ -21,7 +21,7 @@
 #define dsi_phy_write(offset, data) msm_writel((data), (offset))
 
 struct dsi_phy_ops {
-	int (*enable)(struct msm_dsi_phy *phy, bool is_dual_panel,
+	int (*enable)(struct msm_dsi_phy *phy, int src_pll_id,
 		const unsigned long bit_rate, const unsigned long esc_rate);
 	int (*disable)(struct msm_dsi_phy *phy);
 };
@@ -30,6 +30,12 @@ struct dsi_phy_cfg {
 	enum msm_dsi_phy_type type;
 	struct dsi_reg_config reg_cfg;
 	struct dsi_phy_ops ops;
+
+	/* Each cell {phy_id, pll_id} of the truth table indicates
+	 * if the source PLL is on the right side of the PHY.
+	 * Fill default H/W values in illegal cells, eg. cell {0, 1}.
+	 */
+	bool src_pll_truthtable[DSI_MAX][DSI_MAX];
 };
 
 struct dsi_dphy_timing {
@@ -149,6 +155,19 @@ fail:
 	return ret;
 }
 
+static void dsi_phy_set_src_pll(struct msm_dsi_phy *phy, int pll_id, u32 reg)
+{
+	int phy_id = phy->id;
+
+	if ((phy_id >= DSI_MAX) || (pll_id >= DSI_MAX))
+		return;
+
+	if (phy->cfg->src_pll_truthtable[phy_id][pll_id])
+		dsi_phy_write(phy->base + reg, 0x01);
+	else
+		dsi_phy_write(phy->base + reg, 0x00);
+}
+
 #define S_DIV_ROUND_UP(n, d)	\
 	(((n) >= 0) ? (((n) + (d) - 1) / (d)) : (((n) - (d) + 1) / (d)))
 
@@ -295,7 +314,7 @@ static void dsi_28nm_phy_regulator_ctrl(struct msm_dsi_phy *phy, bool enable)
 	dsi_phy_write(base + REG_DSI_28nm_PHY_REGULATOR_CTRL_4, 0x20);
 }
 
-static int dsi_28nm_phy_enable(struct msm_dsi_phy *phy, bool is_dual_panel,
+static int dsi_28nm_phy_enable(struct msm_dsi_phy *phy, int src_pll_id,
 		const unsigned long bit_rate, const unsigned long esc_rate)
 {
 	struct dsi_dphy_timing *timing = &phy->timing;
@@ -368,10 +387,7 @@ static int dsi_28nm_phy_enable(struct msm_dsi_phy *phy, bool is_dual_panel,
 
 	dsi_phy_write(base + REG_DSI_28nm_PHY_CTRL_0, 0x5f);
 
-	if (is_dual_panel && (phy->id != DSI_CLOCK_MASTER))
-		dsi_phy_write(base + REG_DSI_28nm_PHY_GLBL_TEST_CTRL, 0x00);
-	else
-		dsi_phy_write(base + REG_DSI_28nm_PHY_GLBL_TEST_CTRL, 0x01);
+	dsi_phy_set_src_pll(phy, src_pll_id, REG_DSI_28nm_PHY_GLBL_TEST_CTRL);
 
 	return 0;
 }
@@ -414,6 +430,7 @@ static void dsi_phy_disable_resource(struct msm_dsi_phy *phy)
 static const struct dsi_phy_cfg dsi_phy_cfgs[MSM_DSI_PHY_MAX] = {
 	[MSM_DSI_PHY_28NM_HPM] = {
 		.type = MSM_DSI_PHY_28NM_HPM,
+		.src_pll_truthtable = { {true, true}, {false, true} },
 		.reg_cfg = {
 			.num = 1,
 			.regs = {
@@ -427,6 +444,7 @@ static const struct dsi_phy_cfg dsi_phy_cfgs[MSM_DSI_PHY_MAX] = {
 	},
 	[MSM_DSI_PHY_28NM_LP] = {
 		.type = MSM_DSI_PHY_28NM_LP,
+		.src_pll_truthtable = { {true, true}, {true, true} },
 		.reg_cfg = {
 			.num = 1,
 			.regs = {
@@ -557,7 +575,7 @@ void __exit msm_dsi_phy_driver_unregister(void)
 	platform_driver_unregister(&dsi_phy_platform_driver);
 }
 
-int msm_dsi_phy_enable(struct msm_dsi_phy *phy, bool is_dual_panel,
+int msm_dsi_phy_enable(struct msm_dsi_phy *phy, int src_pll_id,
 	const unsigned long bit_rate, const unsigned long esc_rate)
 {
 	int ret;
@@ -572,7 +590,7 @@ int msm_dsi_phy_enable(struct msm_dsi_phy *phy, bool is_dual_panel,
 		return ret;
 	}
 
-	return phy->cfg->ops.enable(phy, is_dual_panel, bit_rate, esc_rate);
+	return phy->cfg->ops.enable(phy, src_pll_id, bit_rate, esc_rate);
 }
 
 int msm_dsi_phy_disable(struct msm_dsi_phy *phy)