[PATCH] drm/bridge/synopsys: dsi: Add 1.31 version support

[Philippe Cornu]

From: Philippe CORNU <philippe.cornu at st.com>

Add support for the Synopsys DesignWare MIPI DSI version 1.31
Two registers need to be updated/added for supporting 1.31:
* PHY_TMR_CFG 0x9c (updated)
  1.30 [31:24] phy_hs2lp_time
       [23:16] phy_lp2hs_time
       [14: 0] max_rd_time

  1.31 [25:16] phy_hs2lp_time
       [ 9: 0] phy_lp2hs_time

* PHY_TMR_RD_CFG 0xf4 (new)
  1.31 [14: 0] max_rd_time

Signed-off-by: Philippe Cornu <philippe.cornu at st.com>
---
 drivers/gpu/drm/bridge/synopsys/dw-mipi-dsi.c | 52 +++++++++++++++++++++++----
 1 file changed, 46 insertions(+), 6 deletions(-)

diff --git a/drivers/gpu/drm/bridge/synopsys/dw-mipi-dsi.c b/drivers/gpu/drm/bridge/synopsys/dw-mipi-dsi.c
index 735f38429c06..20a2ca14a7ad 100644
--- a/drivers/gpu/drm/bridge/synopsys/dw-mipi-dsi.c
+++ b/drivers/gpu/drm/bridge/synopsys/dw-mipi-dsi.c
@@ -25,7 +25,13 @@
 #include <drm/bridge/dw_mipi_dsi.h>
 #include <video/mipi_display.h>
 
+#define HWVER_130			0x31333000	/* IP version 1.30 */
+#define HWVER_131			0x31333100	/* IP version 1.31 */
+#define HWVER_OLDEST			HWVER_130
+#define HWVER_NEWEST			HWVER_131
+
 #define DSI_VERSION			0x00
+#define VERSION				GENMASK(31, 8)
 
 #define DSI_PWR_UP			0x04
 #define RESET				0
@@ -161,11 +167,12 @@
 #define PHY_CLKHS2LP_TIME(lbcc)		(((lbcc) & 0x3ff) << 16)
 #define PHY_CLKLP2HS_TIME(lbcc)		((lbcc) & 0x3ff)
 
-/* TODO Next register is slightly different between 1.30 & 1.31 IP version */
 #define DSI_PHY_TMR_CFG			0x9c
-#define PHY_HS2LP_TIME(lbcc)		(((lbcc) & 0xff) << 24)
-#define PHY_LP2HS_TIME(lbcc)		(((lbcc) & 0xff) << 16)
-#define MAX_RD_TIME(lbcc)		((lbcc) & 0x7fff)
+#define PHY_HS2LP_TIME_V130(lbcc)	(((lbcc) & 0xff) << 24)
+#define PHY_LP2HS_TIME_V130(lbcc)	(((lbcc) & 0xff) << 16)
+#define MAX_RD_TIME_V130(lbcc)		((lbcc) & 0x7fff)
+#define PHY_HS2LP_TIME_V131(lbcc)	(((lbcc) & 0x3ff) << 16)
+#define PHY_LP2HS_TIME_V131(lbcc)	((lbcc) & 0x3ff)
 
 #define DSI_PHY_RSTZ			0xa0
 #define PHY_DISFORCEPLL			0
@@ -204,7 +211,9 @@
 #define DSI_INT_ST1			0xc0
 #define DSI_INT_MSK0			0xc4
 #define DSI_INT_MSK1			0xc8
+
 #define DSI_PHY_TMR_RD_CFG		0xf4
+#define MAX_RD_TIME_V131(lbcc)		((lbcc) & 0x7fff)
 
 #define PHY_STATUS_TIMEOUT_US		10000
 #define CMD_PKT_STATUS_TIMEOUT_US	20000
@@ -215,6 +224,7 @@ struct dw_mipi_dsi {
 	struct drm_bridge *panel_bridge;
 	struct device *dev;
 	void __iomem *base;
+	u32 hw_version;
 
 	struct clk *pclk;
 	struct clk *px_clk;
@@ -616,8 +626,14 @@ static void dw_mipi_dsi_dphy_timing_config(struct dw_mipi_dsi *dsi)
 	 * note: DSI_PHY_TMR_CFG.MAX_RD_TIME should be in line with
 	 * DSI_CMD_MODE_CFG.MAX_RD_PKT_SIZE_LP (see CMD_MODE_ALL_LP)
 	 */
-	dsi_write(dsi, DSI_PHY_TMR_CFG, PHY_HS2LP_TIME(0x40)
-		  | PHY_LP2HS_TIME(0x40) | MAX_RD_TIME(10000));
+	if (dsi->hw_version == HWVER_131) {
+		dsi_write(dsi, DSI_PHY_TMR_CFG, PHY_HS2LP_TIME_V131(0x40) |
+			  PHY_LP2HS_TIME_V131(0x40));
+		dsi_write(dsi, DSI_PHY_TMR_RD_CFG, MAX_RD_TIME_V131(10000));
+	} else {
+		dsi_write(dsi, DSI_PHY_TMR_CFG, PHY_HS2LP_TIME_V130(0x40) |
+			  PHY_LP2HS_TIME_V130(0x40) | MAX_RD_TIME_V130(10000));
+	}
 
 	dsi_write(dsi, DSI_PHY_TMR_LPCLK_CFG, PHY_CLKHS2LP_TIME(0x40)
 		  | PHY_CLKLP2HS_TIME(0x40));
@@ -791,6 +807,28 @@ static const struct drm_bridge_funcs dw_mipi_dsi_bridge_funcs = {
 	.attach	      = dw_mipi_dsi_bridge_attach,
 };
 
+static void dsi_get_version(struct dw_mipi_dsi *dsi)
+{
+	u32 hw_version;
+
+	clk_prepare_enable(dsi->pclk);
+	hw_version = dsi_read(dsi, DSI_VERSION) & VERSION;
+	clk_disable_unprepare(dsi->pclk);
+
+	if (hw_version > HWVER_NEWEST) {
+		DRM_DEBUG("hw version: use 0x%08x for this recent 0x%08x\n",
+			  HWVER_NEWEST, hw_version);
+		hw_version = HWVER_NEWEST;
+
+	} else if (hw_version < HWVER_OLDEST) {
+		DRM_DEBUG("hw version: use 0x%08x for this old 0x%08x\n",
+			  HWVER_OLDEST, hw_version);
+		hw_version = HWVER_OLDEST;
+	}
+
+	dsi->hw_version = hw_version;
+}
+
 static struct dw_mipi_dsi *
 __dw_mipi_dsi_probe(struct platform_device *pdev,
 		    const struct dw_mipi_dsi_plat_data *plat_data)
@@ -870,6 +908,8 @@ __dw_mipi_dsi_probe(struct platform_device *pdev,
 		clk_disable_unprepare(dsi->pclk);
 	}
 
+	dsi_get_version(dsi);
+
 	pm_runtime_enable(dev);
 
 	dsi->dsi_host.ops = &dw_mipi_dsi_host_ops;
-- 
2.15.1