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Subject[PATCH] drm/stm: dsi: Add 1.31 version support
Date
Add support for the stm dsi phy/wrapper version 1.31.
Only lane capabilities need to be modified.

Signed-off-by: Philippe Cornu <philippe.cornu@st.com>
---
drivers/gpu/drm/stm/dw_mipi_dsi-stm.c | 39 +++++++++++++++++++++++++++--------
1 file changed, 30 insertions(+), 9 deletions(-)

diff --git a/drivers/gpu/drm/stm/dw_mipi_dsi-stm.c b/drivers/gpu/drm/stm/dw_mipi_dsi-stm.c
index 0ba8635d738a..a514b593f37c 100644
--- a/drivers/gpu/drm/stm/dw_mipi_dsi-stm.c
+++ b/drivers/gpu/drm/stm/dw_mipi_dsi-stm.c
@@ -14,7 +14,14 @@
#include <drm/bridge/dw_mipi_dsi.h>
#include <video/mipi_display.h>

-/* DSI wrapper register & bit definitions */
+#define HWVER_130 0x31333000 /* IP version 1.30 */
+#define HWVER_131 0x31333100 /* IP version 1.31 */
+
+/* DSI digital registers & bit definitions */
+#define DSI_VERSION 0x00
+#define VERSION GENMASK(31, 8)
+
+/* DSI wrapper registers & bit definitions */
/* Note: registers are named as in the Reference Manual */
#define DSI_WCFGR 0x0400 /* Wrapper ConFiGuration Reg */
#define WCFGR_DSIM BIT(0) /* DSI Mode */
@@ -66,6 +73,9 @@ struct dw_mipi_dsi_stm {
void __iomem *base;
struct clk *pllref_clk;
struct dw_mipi_dsi *dsi;
+ u32 hw_version;
+ int lane_min_kbps;
+ int lane_max_kbps;
};

static inline void dsi_write(struct dw_mipi_dsi_stm *dsi, u32 reg, u32 val)
@@ -122,7 +132,8 @@ static int dsi_pll_get_clkout_khz(int clkin_khz, int idf, int ndiv, int odf)
return DIV_ROUND_CLOSEST(clkin_khz * ndiv, divisor);
}

-static int dsi_pll_get_params(int clkin_khz, int clkout_khz,
+static int dsi_pll_get_params(struct dw_mipi_dsi_stm *dsi,
+ int clkin_khz, int clkout_khz,
int *idf, int *ndiv, int *odf)
{
int i, o, n, n_min, n_max;
@@ -132,8 +143,8 @@ static int dsi_pll_get_params(int clkin_khz, int clkout_khz,
if (clkin_khz <= 0 || clkout_khz <= 0)
return -EINVAL;

- fvco_min = LANE_MIN_KBPS * 2 * ODF_MAX;
- fvco_max = LANE_MAX_KBPS * 2 * ODF_MIN;
+ fvco_min = dsi->lane_min_kbps * 2 * ODF_MAX;
+ fvco_max = dsi->lane_max_kbps * 2 * ODF_MIN;

best_delta = 1000000; /* big started value (1000000khz) */

@@ -213,6 +224,15 @@ dw_mipi_dsi_get_lane_mbps(void *priv_data, struct drm_display_mode *mode,
int ret, bpp;
u32 val;

+ /* Update lane capabilities according to hw version */
+ dsi->hw_version = dsi_read(dsi, DSI_VERSION) & VERSION;
+ dsi->lane_min_kbps = LANE_MIN_KBPS;
+ dsi->lane_max_kbps = LANE_MAX_KBPS;
+ if (dsi->hw_version == HWVER_131) {
+ dsi->lane_min_kbps *= 2;
+ dsi->lane_max_kbps *= 2;
+ }
+
pll_in_khz = (unsigned int)(clk_get_rate(dsi->pllref_clk) / 1000);

/* Compute requested pll out */
@@ -220,12 +240,12 @@ dw_mipi_dsi_get_lane_mbps(void *priv_data, struct drm_display_mode *mode,
pll_out_khz = mode->clock * bpp / lanes;
/* Add 20% to pll out to be higher than pixel bw (burst mode only) */
pll_out_khz = (pll_out_khz * 12) / 10;
- if (pll_out_khz > LANE_MAX_KBPS) {
- pll_out_khz = LANE_MAX_KBPS;
+ if (pll_out_khz > dsi->lane_max_kbps) {
+ pll_out_khz = dsi->lane_max_kbps;
DRM_WARN("Warning max phy mbps is used\n");
}
- if (pll_out_khz < LANE_MIN_KBPS) {
- pll_out_khz = LANE_MIN_KBPS;
+ if (pll_out_khz < dsi->lane_min_kbps) {
+ pll_out_khz = dsi->lane_min_kbps;
DRM_WARN("Warning min phy mbps is used\n");
}

@@ -233,7 +253,8 @@ dw_mipi_dsi_get_lane_mbps(void *priv_data, struct drm_display_mode *mode,
idf = 0;
ndiv = 0;
odf = 0;
- ret = dsi_pll_get_params(pll_in_khz, pll_out_khz, &idf, &ndiv, &odf);
+ ret = dsi_pll_get_params(dsi, pll_in_khz, pll_out_khz,
+ &idf, &ndiv, &odf);
if (ret)
DRM_WARN("Warning dsi_pll_get_params(): bad params\n");

--
2.15.1
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