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Subject[PATCH] drm/bridge/synopsys: dsi: Add 1.31 version support
Date
From: Philippe CORNU <philippe.cornu@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@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
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