[PATCH 15/20] drm/bridge: tc358775: dynamically configure DSI link settings
From: Michael Walle
Date: Mon May 06 2024 - 09:39:54 EST
Instead of hardcoding the settings for just one (unknown) particular
frequency and lane setting, compute the DSI link parameters using the
handy phy_mipi_dphy_get_default_config() helper function.
The DSI_START and DSI_BUSY registers were removed in version 0.6 of the
datasheet. It seems that it applies to a different bridge and was just a
leftover. Remove the DSI_START handling and the (unused) DSI_BUSY macro.
Signed-off-by: Michael Walle <mwalle@xxxxxxxxxx>
---
drivers/gpu/drm/bridge/Kconfig | 1 +
drivers/gpu/drm/bridge/tc358775.c | 58 +++++++++++++++++++++++----------------
2 files changed, 35 insertions(+), 24 deletions(-)
diff --git a/drivers/gpu/drm/bridge/Kconfig b/drivers/gpu/drm/bridge/Kconfig
index c621be1a99a8..ed018d6f1da3 100644
--- a/drivers/gpu/drm/bridge/Kconfig
+++ b/drivers/gpu/drm/bridge/Kconfig
@@ -349,6 +349,7 @@ config DRM_TOSHIBA_TC358775
select REGMAP_I2C
select DRM_PANEL
select DRM_MIPI_DSI
+ select GENERIC_PHY_MIPI_DPHY
help
Toshiba TC358775 DSI/LVDS bridge chip driver.
diff --git a/drivers/gpu/drm/bridge/tc358775.c b/drivers/gpu/drm/bridge/tc358775.c
index e3fba7ac71ec..33a97ddba7b5 100644
--- a/drivers/gpu/drm/bridge/tc358775.c
+++ b/drivers/gpu/drm/bridge/tc358775.c
@@ -19,6 +19,7 @@
#include <linux/regmap.h>
#include <linux/regulator/consumer.h>
#include <linux/slab.h>
+#include <linux/phy/phy-mipi-dphy.h>
#include <asm/unaligned.h>
@@ -49,12 +50,14 @@
/* DSI PPI Layer Registers */
#define PPI_STARTPPI 0x0104 /* START control bit of PPI-TX function. */
-#define PPI_START_FUNCTION 1
+#define PPI_STARTPPI_STARTPPI BIT(0)
#define PPI_BUSYPPI 0x0108
#define PPI_LINEINITCNT 0x0110 /* Line Initialization Wait Counter */
#define PPI_LPTXTIMECNT 0x0114
#define PPI_LANEENABLE 0x0134 /* Enables each lane at the PPI layer. */
+#define LANEENABLE_CLEN BIT(0)
+#define LANEENABLE_L0EN BIT(1)
#define PPI_TX_RX_TA 0x013C /* DSI Bus Turn Around timing parameters */
/* Analog timer function enable */
@@ -89,10 +92,7 @@
#define PPI_CLRSIPO 0x01E4 /* Clear SIPO values, Slave mode use only. */
#define HSTIMEOUT 0x01F0 /* HS Rx Time Out Counter */
#define HSTIMEOUTENABLE 0x01F4 /* Enable HS Rx Time Out Counter */
-#define DSI_STARTDSI 0x0204 /* START control bit of DSI-TX function */
-#define DSI_RX_START 1
-#define DSI_BUSYDSI 0x0208
#define DSI_LANEENABLE 0x0210 /* Enables each lane at the Protocol layer. */
#define DSI_LANESTATUS0 0x0214 /* Displays lane is in HS RX mode. */
#define DSI_LANESTATUS1 0x0218 /* Displays lane is in ULPS or STOP state */
@@ -174,21 +174,12 @@ enum {
/* Chip ID and Revision ID Register */
#define IDREG 0x0580
-#define LPX_PERIOD 4
-#define TTA_GET 0x40000
-#define TTA_SURE 6
-#define SINGLE_LINK 1
-#define DUAL_LINK 2
-
#define TC358775XBG_ID 0x00007500
/* Debug Registers */
#define DEBUG00 0x05A0 /* Debug */
#define DEBUG01 0x05A4 /* LVDS Data */
-#define DSI_CLEN_BIT BIT(0)
-#define L0EN BIT(1)
-
enum tc358775_ports {
TC358775_DSI_IN,
TC358775_LVDS_OUT0,
@@ -314,23 +305,42 @@ static const struct reg_sequence tc_lvmux_jeida18_24[] = {
{ LV_MX2427, LV_MX(LVI_HS, LVI_VS, LVI_DE, LVI_R0) },
};
-static void tc358775_configure_dsi(struct tc_data *tc)
+/* All the DSI timing is counted by the HS byte clock internally */
+static uint32_t tc358775_ps_to_cnt(unsigned long long ps,
+ struct phy_configure_opts_mipi_dphy *cfg)
{
+ unsigned long hs_byte_clk = cfg->hs_clk_rate / 8;
+
+ return DIV_ROUND_UP(ps * hs_byte_clk, PSEC_PER_SEC);
+}
+
+static void tc358775_configure_dsi(struct tc_data *tc, unsigned int pixelclk)
+{
+ int bpp = mipi_dsi_pixel_format_to_bpp(tc->dsi->format);
+ struct phy_configure_opts_mipi_dphy cfg;
unsigned int val;
- regmap_write(tc->regmap, PPI_TX_RX_TA, TTA_GET | TTA_SURE);
- regmap_write(tc->regmap, PPI_LPTXTIMECNT, LPX_PERIOD);
- regmap_write(tc->regmap, PPI_D0S_CLRSIPOCOUNT, 3);
- regmap_write(tc->regmap, PPI_D1S_CLRSIPOCOUNT, 3);
- regmap_write(tc->regmap, PPI_D2S_CLRSIPOCOUNT, 3);
- regmap_write(tc->regmap, PPI_D3S_CLRSIPOCOUNT, 3);
+ phy_mipi_dphy_get_default_config(pixelclk * 1000, bpp,
+ tc->num_dsi_lanes, &cfg);
+
+ regmap_write(tc->regmap, PPI_TX_RX_TA,
+ (tc358775_ps_to_cnt(cfg.ta_get, &cfg) << 16) |
+ tc358775_ps_to_cnt(cfg.ta_sure, &cfg));
+ regmap_write(tc->regmap, PPI_LPTXTIMECNT,
+ tc358775_ps_to_cnt(cfg.lpx, &cfg));
+
+ val = tc358775_ps_to_cnt(cfg.hs_settle, &cfg);
+ regmap_write(tc->regmap, PPI_D0S_CLRSIPOCOUNT, val);
+ regmap_write(tc->regmap, PPI_D1S_CLRSIPOCOUNT, val);
+ regmap_write(tc->regmap, PPI_D2S_CLRSIPOCOUNT, val);
+ regmap_write(tc->regmap, PPI_D3S_CLRSIPOCOUNT, val);
- val = ((L0EN << tc->num_dsi_lanes) - L0EN) | DSI_CLEN_BIT;
+ val = LANEENABLE_CLEN;
+ val |= (LANEENABLE_L0EN << tc->num_dsi_lanes) - LANEENABLE_L0EN;
regmap_write(tc->regmap, PPI_LANEENABLE, val);
regmap_write(tc->regmap, DSI_LANEENABLE, val);
- regmap_write(tc->regmap, PPI_STARTPPI, PPI_START_FUNCTION);
- regmap_write(tc->regmap, DSI_STARTDSI, DSI_RX_START);
+ regmap_write(tc->regmap, PPI_STARTPPI, PPI_STARTPPI_STARTPPI);
}
static void tc358775_configure_lvds_timings(struct tc_data *tc,
@@ -461,7 +471,7 @@ static void tc358775_bridge_enable(struct drm_bridge *bridge)
SYS_RST_I2CM);
usleep_range(30000, 40000);
- tc358775_configure_dsi(tc);
+ tc358775_configure_dsi(tc, mode->crtc_clock);
tc358775_configure_lvds_timings(tc, mode);
tc358775_configure_pll(tc, mode->crtc_clock);
tc358775_configure_color_mapping(tc, connector->display_info.bus_formats[0]);
--
2.39.2