[PATCH 9/9] drm/bridge: imx: Add i.MX93 MIPI DSI support

Liu Ying
2023-07-17T06:14:47Z

Freescale i.MX93 SoC embeds a Synopsys Designware MIPI DSI host
controller and a Synopsys Designware MIPI DPHY. Some configurations
and extensions to them are controlled by i.MX93 media blk-ctrl.

Add a DRM bridge for i.MX93 MIPI DSI by using existing DW MIPI DSI
bridge helpers and implementing i.MX93 MIPI DSI specific extensions.

Signed-off-by: Liu Ying <victor.liu@nxp.com>
---
drivers/gpu/drm/bridge/imx/Kconfig | 10 +
drivers/gpu/drm/bridge/imx/Makefile | 1 +
drivers/gpu/drm/bridge/imx/imx93-mipi-dsi.c | 934 ++++++++++++++++++++
3 files changed, 945 insertions(+)
create mode 100644 drivers/gpu/drm/bridge/imx/imx93-mipi-dsi.c

diff --git a/drivers/gpu/drm/bridge/imx/Kconfig b/drivers/gpu/drm/bridge/imx/Kconfig
index 9fae28db6aa7..5182298c7182 100644
--- a/drivers/gpu/drm/bridge/imx/Kconfig
+++ b/drivers/gpu/drm/bridge/imx/Kconfig
@@ -49,4 +49,14 @@ config DRM_IMX8QXP_PIXEL_LINK_TO_DPI
Choose this to enable pixel link to display pixel interface(PXL2DPI)
found in Freescale i.MX8qxp processor.

+config DRM_IMX93_MIPI_DSI
+ tristate "Freescale i.MX93 specific extensions for Synopsys DW MIPI DSI"
+ depends on OF
+ depends on COMMON_CLK
+ select DRM_DW_MIPI_DSI
+ select GENERIC_PHY_MIPI_DPHY
+ help
+ Choose this to enable MIPI DSI controller found in Freescale i.MX93
+ processor.
+
endif # ARCH_MXC || COMPILE_TEST
diff --git a/drivers/gpu/drm/bridge/imx/Makefile b/drivers/gpu/drm/bridge/imx/Makefile
index 8e2ebf3399a1..2b0c2e44aa1b 100644
--- a/drivers/gpu/drm/bridge/imx/Makefile
+++ b/drivers/gpu/drm/bridge/imx/Makefile
@@ -4,3 +4,4 @@ obj-$(CONFIG_DRM_IMX8QXP_LDB) += imx8qxp-ldb.o
obj-$(CONFIG_DRM_IMX8QXP_PIXEL_COMBINER) += imx8qxp-pixel-combiner.o
obj-$(CONFIG_DRM_IMX8QXP_PIXEL_LINK) += imx8qxp-pixel-link.o
obj-$(CONFIG_DRM_IMX8QXP_PIXEL_LINK_TO_DPI) += imx8qxp-pxl2dpi.o
+obj-$(CONFIG_DRM_IMX93_MIPI_DSI) += imx93-mipi-dsi.o
diff --git a/drivers/gpu/drm/bridge/imx/imx93-mipi-dsi.c b/drivers/gpu/drm/bridge/imx/imx93-mipi-dsi.c
new file mode 100644
index 000000000000..77f59e3407a0
--- /dev/null
+++ b/drivers/gpu/drm/bridge/imx/imx93-mipi-dsi.c
@@ -0,0 +1,934 @@
+// SPDX-License-Identifier: GPL-2.0+
+
+/*
+ * Copyright 2022,2023 NXP
+ */
+
+#include <linux/bitfield.h>
+#include <linux/bits.h>
+#include <linux/clk.h>
+#include <linux/delay.h>
+#include <linux/math.h>
+#include <linux/media-bus-format.h>
+#include <linux/mfd/syscon.h>
+#include <linux/module.h>
+#include <linux/of.h>
+#include <linux/phy/phy.h>
+#include <linux/phy/phy-mipi-dphy.h>
+#include <linux/platform_device.h>
+#include <linux/regmap.h>
+
+#include <drm/bridge/dw_mipi_dsi.h>
+#include <drm/drm_bridge.h>
+#include <drm/drm_mipi_dsi.h>
+#include <drm/drm_modes.h>
+#include <drm/drm_print.h>
+
+/* DPHY PLL configuration registers */
+#define DSI_REG 0x4c
+#define CFGCLKFREQRANGE_MASK GENMASK(5, 0)
+#define CFGCLKFREQRANGE(x) FIELD_PREP(CFGCLKFREQRANGE_MASK, (x))
+#define CLKSEL_MASK GENMASK(7, 6)
+#define CLKSEL_STOP FIELD_PREP(CLKSEL_MASK, 0)
+#define CLKSEL_GEN FIELD_PREP(CLKSEL_MASK, 1)
+#define CLKSEL_EXT FIELD_PREP(CLKSEL_MASK, 2)
+#define HSFREQRANGE_MASK GENMASK(14, 8)
+#define HSFREQRANGE(x) FIELD_PREP(HSFREQRANGE_MASK, (x))
+#define UPDATE_PLL BIT(17)
+#define SHADOW_CLR BIT(18)
+#define CLK_EXT BIT(19)
+
+#define DSI_WRITE_REG0 0x50
+#define M_MASK GENMASK(9, 0)
+#define M(x) FIELD_PREP(M_MASK, ((x) - 2))
+#define N_MASK GENMASK(13, 10)
+#define N(x) FIELD_PREP(N_MASK, ((x) - 1))
+#define VCO_CTRL_MASK GENMASK(19, 14)
+#define VCO_CTRL(x) FIELD_PREP(VCO_CTRL_MASK, (x))
+#define PROP_CTRL_MASK GENMASK(25, 20)
+#define PROP_CTRL(x) FIELD_PREP(PROP_CTRL_MASK, (x))
+#define INT_CTRL_MASK GENMASK(31, 26)
+#define INT_CTRL(x) FIELD_PREP(INT_CTRL_MASK, (x))
+
+#define DSI_WRITE_REG1 0x54
+#define GMP_CTRL_MASK GENMASK(1, 0)
+#define GMP_CTRL(x) FIELD_PREP(GMP_CTRL_MASK, (x))
+#define CPBIAS_CTRL_MASK GENMASK(8, 2)
+#define CPBIAS_CTRL(x) FIELD_PREP(CPBIAS_CTRL_MASK, (x))
+#define PLL_SHADOW_CTRL BIT(9)
+
+/* display mux control register */
+#define DISPLAY_MUX 0x60
+#define MIPI_DSI_RGB666_MAP_CFG GENMASK(7, 6)
+#define RGB666_CONFIG1 FIELD_PREP(MIPI_DSI_RGB666_MAP_CFG, 0)
+#define RGB666_CONFIG2 FIELD_PREP(MIPI_DSI_RGB666_MAP_CFG, 1)
+#define MIPI_DSI_RGB565_MAP_CFG GENMASK(5, 4)
+#define RGB565_CONFIG1 FIELD_PREP(MIPI_DSI_RGB565_MAP_CFG, 0)
+#define RGB565_CONFIG2 FIELD_PREP(MIPI_DSI_RGB565_MAP_CFG, 1)
+#define RGB565_CONFIG3 FIELD_PREP(MIPI_DSI_RGB565_MAP_CFG, 2)
+#define LCDIF_CROSS_LINE_PATTERN GENMASK(3, 0)
+#define RGB888_TO_RGB888 FIELD_PREP(LCDIF_CROSS_LINE_PATTERN, 0)
+#define RGB888_TO_RGB666 FIELD_PREP(LCDIF_CROSS_LINE_PATTERN, 6)
+#define RGB565_TO_RGB565 FIELD_PREP(LCDIF_CROSS_LINE_PATTERN, 7)
+
+#define MHZ(x) ((x) * 1000000UL)
+
+#define REF_CLK_RATE_MAX MHZ(64)
+#define REF_CLK_RATE_MIN MHZ(2)
+#define FOUT_MAX MHZ(1250)
+#define FOUT_MIN MHZ(40)
+#define FVCO_DIV_FACTOR MHZ(80)
+
+#define MBPS(x) ((x) * 1000000UL)
+
+#define DATA_RATE_MAX_SPEED MBPS(2500)
+#define DATA_RATE_MIN_SPEED MBPS(80)
+
+#define M_MAX 625UL
+#define M_MIN 64UL
+
+#define N_MAX 16U
+#define N_MIN 1U
+
+struct imx93_dsi {
+ struct device *dev;
+ struct regmap *regmap;
+ struct clk *clk_pixel;
+ struct clk *clk_ref;
+ struct clk *clk_cfg;
+ struct dw_mipi_dsi *dmd;
+ struct dw_mipi_dsi_plat_data pdata;
+ union phy_configure_opts phy_cfg;
+ unsigned long ref_clk_rate;
+ u32 format;
+};
+
+struct dphy_pll_cfg {
+ u32 m; /* PLL Feedback Multiplication Ratio */
+ u32 n; /* PLL Input Frequency Division Ratio */
+};
+
+struct dphy_pll_vco_prop {
+ unsigned long max_fout;
+ u8 vco_cntl;
+ u8 prop_cntl;
+};
+
+struct dphy_pll_hsfreqrange {
+ unsigned long max_mbps;
+ u8 hsfreqrange;
+};
+
+/* DPHY Databook Table 3-13 Charge-pump Programmability */
+static const struct dphy_pll_vco_prop vco_prop_map[] = {
+ { 55, 0x3f, 0x0d },
+ { 82, 0x37, 0x0d },
+ { 110, 0x2f, 0x0d },
+ { 165, 0x27, 0x0d },
+ { 220, 0x1f, 0x0d },
+ { 330, 0x17, 0x0d },
+ { 440, 0x0f, 0x0d },
+ { 660, 0x07, 0x0d },
+ { 1149, 0x03, 0x0d },
+ { 1152, 0x01, 0x0d },
+ { 1250, 0x01, 0x0e },
+};
+
+/* DPHY Databook Table 5-7 Frequency Ranges and Defaults */
+static const struct dphy_pll_hsfreqrange hsfreqrange_map[] = {
+ { 89, 0x00 },
+ { 99, 0x10 },
+ { 109, 0x20 },
+ { 119, 0x30 },
+ { 129, 0x01 },
+ { 139, 0x11 },
+ { 149, 0x21 },
+ { 159, 0x31 },
+ { 169, 0x02 },
+ { 179, 0x12 },
+ { 189, 0x22 },
+ { 204, 0x32 },
+ { 219, 0x03 },
+ { 234, 0x13 },
+ { 249, 0x23 },
+ { 274, 0x33 },
+ { 299, 0x04 },
+ { 324, 0x14 },
+ { 349, 0x25 },
+ { 399, 0x35 },
+ { 449, 0x05 },
+ { 499, 0x16 },
+ { 549, 0x26 },
+ { 599, 0x37 },
+ { 649, 0x07 },
+ { 699, 0x18 },
+ { 749, 0x28 },
+ { 799, 0x39 },
+ { 849, 0x09 },
+ { 899, 0x19 },
+ { 949, 0x29 },
+ { 999, 0x3a },
+ { 1049, 0x0a },
+ { 1099, 0x1a },
+ { 1149, 0x2a },
+ { 1199, 0x3b },
+ { 1249, 0x0b },
+ { 1299, 0x1b },
+ { 1349, 0x2b },
+ { 1399, 0x3c },
+ { 1449, 0x0c },
+ { 1499, 0x1c },
+ { 1549, 0x2c },
+ { 1599, 0x3d },
+ { 1649, 0x0d },
+ { 1699, 0x1d },
+ { 1749, 0x2e },
+ { 1799, 0x3e },
+ { 1849, 0x0e },
+ { 1899, 0x1e },
+ { 1949, 0x2f },
+ { 1999, 0x3f },
+ { 2049, 0x0f },
+ { 2099, 0x40 },
+ { 2149, 0x41 },
+ { 2199, 0x42 },
+ { 2249, 0x43 },
+ { 2299, 0x44 },
+ { 2349, 0x45 },
+ { 2399, 0x46 },
+ { 2449, 0x47 },
+ { 2499, 0x48 },
+ { 2500, 0x49 },
+};
+
+static void dphy_pll_write(struct imx93_dsi *dsi, unsigned int reg, u32 value)
+{
+ int ret;
+
+ ret = regmap_write(dsi->regmap, reg, value);
+ if (ret < 0)
+ DRM_DEV_ERROR(dsi->dev,
+ "failed to write 0x%08x to pll reg 0x%x: %d\n",
+ value, reg, ret);
+}
+
+static inline unsigned long data_rate_to_fout(unsigned long data_rate)
+{
+ /* Fout is half of data rate */
+ return data_rate / 2;
+}
+
+static int
+dphy_pll_get_configure_from_opts(struct imx93_dsi *dsi,
+ struct phy_configure_opts_mipi_dphy *dphy_opts,
+ struct dphy_pll_cfg *cfg)
+{
+ struct device *dev = dsi->dev;
+ unsigned long fin = dsi->ref_clk_rate;
+ unsigned long fout;
+ unsigned long best_fout = 0;
+ unsigned int fvco_div;
+ unsigned int min_n, max_n, n, best_n;
+ unsigned long m, best_m;
+ unsigned long min_delta = ULONG_MAX;
+ unsigned long tmp, delta;
+
+ if (dphy_opts->hs_clk_rate < DATA_RATE_MIN_SPEED ||
+ dphy_opts->hs_clk_rate > DATA_RATE_MAX_SPEED) {
+ DRM_DEV_DEBUG_DRIVER(dev, "invalid data rate per lane: %lu\n",
+ dphy_opts->hs_clk_rate);
+ return -EINVAL;
+ }
+
+ fout = data_rate_to_fout(dphy_opts->hs_clk_rate);
+
+ /* DPHY Databook 3.3.6.1 Output Frequency */
+ /* Fout = Fvco / Fvco_div = (Fin * M) / (Fvco_div * N) */
+ /* Fvco_div could be 1/2/4/8 according to Fout range. */
+ fvco_div = 8UL / min(DIV_ROUND_UP(fout, FVCO_DIV_FACTOR), 8UL);
+
+ /* limitation: 2MHz <= Fin / N <= 8MHz */
+ min_n = DIV_ROUND_UP_ULL((u64)fin, MHZ(8));
+ max_n = DIV_ROUND_DOWN_ULL((u64)fin, MHZ(2));
+
+ /* clamp possible N(s) */
+ min_n = clamp(min_n, N_MIN, N_MAX);
+ max_n = clamp(max_n, N_MIN, N_MAX);
+
+ DRM_DEV_DEBUG_DRIVER(dev, "Fout = %lu, Fvco_div = %u, n_range = [%u, %u]\n",
+ fout, fvco_div, min_n, max_n);
+
+ for (n = min_n; n <= max_n; n++) {
+ /* M = (Fout * N * Fvco_div) / Fin */
+ tmp = fout * n * fvco_div;
+ m = DIV_ROUND_CLOSEST(tmp, fin);
+
+ /* check M range */
+ if (m < M_MIN || m > M_MAX)
+ continue;
+
+ /* calculate temporary Fout */
+ tmp = m * fin;
+ do_div(tmp, n * fvco_div);
+ if (tmp < FOUT_MIN || tmp > FOUT_MAX)
+ continue;
+
+ delta = abs(fout - tmp);
+ if (delta < min_delta) {
+ best_n = n;
+ best_m = m;
+ min_delta = delta;
+ best_fout = tmp;
+ }
+ }
+
+ if (best_fout) {
+ cfg->m = best_m;
+ cfg->n = best_n;
+ DRM_DEV_DEBUG_DRIVER(dev, "best Fout = %lu, m = %u, n = %u\n",
+ best_fout, cfg->m, cfg->n);
+ } else {
+ DRM_DEV_DEBUG_DRIVER(dev, "failed to find best Fout\n");
+ return -EINVAL;
+ }
+
+ return 0;
+}
+
+static void dphy_pll_clear_shadow(struct imx93_dsi *dsi)
+{
+ /* Reference DPHY Databook Figure 3-3 Initialization Timing Diagram. */
+ /* Select clock generation first. */
+ dphy_pll_write(dsi, DSI_REG, CLKSEL_GEN);
+
+ /* Clear shadow after clock selection is done a while. */
+ fsleep(1);
+ dphy_pll_write(dsi, DSI_REG, CLKSEL_GEN | SHADOW_CLR);
+
+ /* A minimum pulse of 5ns on shadow_clear signal. */
+ fsleep(1);
+ dphy_pll_write(dsi, DSI_REG, CLKSEL_GEN);
+}
+
+static unsigned long dphy_pll_get_cfgclkrange(struct imx93_dsi *dsi)
+{
+ /*
+ * DPHY Databook Table 4-4 System Control Signals mentions an equation
+ * for cfgclkfreqrange[5:0].
+ */
+ return (clk_get_rate(dsi->clk_cfg) / MHZ(1) - 17) * 4;
+}
+
+static u8
+dphy_pll_get_hsfreqrange(struct phy_configure_opts_mipi_dphy *dphy_opts)
+{
+ unsigned long mbps = dphy_opts->hs_clk_rate / MHZ(1);
+ int i;
+
+ for (i = 0; i < ARRAY_SIZE(hsfreqrange_map); i++)
+ if (mbps <= hsfreqrange_map[i].max_mbps)
+ return hsfreqrange_map[i].hsfreqrange;
+
+ return 0;
+}
+
+static u8 dphy_pll_get_vco(struct phy_configure_opts_mipi_dphy *dphy_opts)
+{
+ unsigned long fout = data_rate_to_fout(dphy_opts->hs_clk_rate) / MHZ(1);
+ int i;
+
+ for (i = 0; i < ARRAY_SIZE(vco_prop_map); i++)
+ if (fout <= vco_prop_map[i].max_fout)
+ return vco_prop_map[i].vco_cntl;
+
+ return 0;
+}
+
+static u8 dphy_pll_get_prop(struct phy_configure_opts_mipi_dphy *dphy_opts)
+{
+ unsigned long fout = data_rate_to_fout(dphy_opts->hs_clk_rate) / MHZ(1);
+ int i;
+
+ for (i = 0; i < ARRAY_SIZE(vco_prop_map); i++)
+ if (fout <= vco_prop_map[i].max_fout)
+ return vco_prop_map[i].prop_cntl;
+
+ return 0;
+}
+
+static int dphy_pll_update(struct imx93_dsi *dsi)
+{
+ int ret;
+
+ ret = regmap_update_bits(dsi->regmap, DSI_REG, UPDATE_PLL, UPDATE_PLL);
+ if (ret < 0) {
+ DRM_DEV_ERROR(dsi->dev, "failed to set UPDATE_PLL: %d\n", ret);
+ return ret;
+ }
+
+ /*
+ * The updatepll signal should be asserted for a minimum of four clkin
+ * cycles, according to DPHY Databook Figure 3-3 Initialization Timing
+ * Diagram.
+ */
+ fsleep(10);
+
+ ret = regmap_update_bits(dsi->regmap, DSI_REG, UPDATE_PLL, 0);
+ if (ret < 0) {
+ DRM_DEV_ERROR(dsi->dev, "failed to clear UPDATE_PLL: %d\n", ret);
+ return ret;
+ }
+
+ return 0;
+}
+
+static int dphy_pll_configure(struct imx93_dsi *dsi, union phy_configure_opts *opts)
+{
+ struct dphy_pll_cfg cfg = { 0 };
+ u32 val;
+ int ret;
+
+ ret = dphy_pll_get_configure_from_opts(dsi, &opts->mipi_dphy, &cfg);
+ if (ret) {
+ DRM_DEV_ERROR(dsi->dev, "failed to get phy pll cfg %d\n", ret);
+ return ret;
+ }
+
+ dphy_pll_clear_shadow(dsi);
+
+ /* DSI_REG */
+ val = CLKSEL_GEN |
+ CFGCLKFREQRANGE(dphy_pll_get_cfgclkrange(dsi)) |
+ HSFREQRANGE(dphy_pll_get_hsfreqrange(&opts->mipi_dphy));
+ dphy_pll_write(dsi, DSI_REG, val);
+
+ /* DSI_WRITE_REG0 */
+ val = M(cfg.m) | N(cfg.n) | INT_CTRL(0) |
+ VCO_CTRL(dphy_pll_get_vco(&opts->mipi_dphy)) |
+ PROP_CTRL(dphy_pll_get_prop(&opts->mipi_dphy));
+ dphy_pll_write(dsi, DSI_WRITE_REG0, val);
+
+ /* DSI_WRITE_REG1 */
+ dphy_pll_write(dsi, DSI_WRITE_REG1, GMP_CTRL(1) | CPBIAS_CTRL(0x10));
+
+ ret = clk_prepare_enable(dsi->clk_ref);
+ if (ret < 0) {
+ DRM_DEV_ERROR(dsi->dev, "failed to enable ref clock: %d\n", ret);
+ return ret;
+ }
+
+ /*
+ * At least 10 refclk cycles are required before updatePLL assertion,
+ * according to DPHY Databook Figure 3-3 Initialization Timing Diagram.
+ */
+ fsleep(10);
+
+ ret = dphy_pll_update(dsi);
+ if (ret < 0) {
+ clk_disable_unprepare(dsi->clk_ref);
+ return ret;
+ }
+
+ return 0;
+}
+
+static void dphy_pll_clear_reg(struct imx93_dsi *dsi)
+{
+ dphy_pll_write(dsi, DSI_REG, 0);
+ dphy_pll_write(dsi, DSI_WRITE_REG0, 0);
+ dphy_pll_write(dsi, DSI_WRITE_REG1, 0);
+}
+
+static int dphy_pll_init(struct imx93_dsi *dsi)
+{
+ int ret;
+
+ ret = clk_prepare_enable(dsi->clk_cfg);
+ if (ret < 0) {
+ DRM_DEV_ERROR(dsi->dev, "failed to enable config clock: %d\n", ret);
+ return ret;
+ }
+
+ dphy_pll_clear_reg(dsi);
+
+ return 0;
+}
+
+static void dphy_pll_uninit(struct imx93_dsi *dsi)
+{
+ dphy_pll_clear_reg(dsi);
+ clk_disable_unprepare(dsi->clk_cfg);
+}
+
+static void dphy_pll_power_off(struct imx93_dsi *dsi)
+{
+ dphy_pll_clear_reg(dsi);
+ clk_disable_unprepare(dsi->clk_ref);
+}
+
+static int imx93_dsi_get_phy_configure_opts(struct imx93_dsi *dsi,
+ const struct drm_display_mode *mode,
+ union phy_configure_opts *phy_cfg,
+ u32 lanes, u32 format)
+{
+ struct device *dev = dsi->dev;
+ int bpp;
+ int ret;
+
+ bpp = mipi_dsi_pixel_format_to_bpp(format);
+ if (bpp < 0) {
+ DRM_DEV_DEBUG_DRIVER(dev, "failed to get bpp for pixel format %d\n",
+ format);
+ return -EINVAL;
+ }
+
+ ret = phy_mipi_dphy_get_default_config(mode->clock * MSEC_PER_SEC, bpp,
+ lanes, &phy_cfg->mipi_dphy);
+ if (ret < 0) {
+ DRM_DEV_DEBUG_DRIVER(dev, "failed to get default phy cfg %d\n", ret);
+ return ret;
+ }
+
+ return 0;
+}
+
+static enum drm_mode_status
+imx93_dsi_validate_mode(struct imx93_dsi *dsi, const struct drm_display_mode *mode)
+{
+ struct drm_bridge *bridge = dw_mipi_dsi_get_bridge(dsi->dmd);
+
+ /* Get the last bridge */
+ while (drm_bridge_get_next_bridge(bridge))
+ bridge = drm_bridge_get_next_bridge(bridge);
+
+ if ((bridge->ops & DRM_BRIDGE_OP_DETECT) &&
+ (bridge->ops & DRM_BRIDGE_OP_EDID)) {
+ unsigned long pixel_clock_rate = mode->clock * 1000;
+ unsigned long rounded_rate;
+
+ /* Allow +/-0.5% pixel clock rate deviation */
+ rounded_rate = clk_round_rate(dsi->clk_pixel, pixel_clock_rate);
+ if (rounded_rate < pixel_clock_rate * 995 / 1000 ||
+ rounded_rate > pixel_clock_rate * 1005 / 1000) {
+ DRM_DEV_DEBUG_DRIVER(dsi->dev,
+ "failed to round clock for mode " DRM_MODE_FMT "\n",
+ DRM_MODE_ARG(mode));
+ return MODE_NOCLOCK;
+ }
+ }
+
+ return MODE_OK;
+}
+
+static enum drm_mode_status
+imx93_dsi_validate_phy(struct imx93_dsi *dsi, const struct drm_display_mode *mode,
+ unsigned long mode_flags, u32 lanes, u32 format)
+{
+ union phy_configure_opts phy_cfg;
+ struct dphy_pll_cfg cfg = { 0 };
+ struct device *dev = dsi->dev;
+ int ret;
+
+ ret = imx93_dsi_get_phy_configure_opts(dsi, mode, &phy_cfg, lanes,
+ format);
+ if (ret < 0) {
+ DRM_DEV_DEBUG_DRIVER(dev, "failed to get phy cfg opts %d\n", ret);
+ return MODE_ERROR;
+ }
+
+ ret = dphy_pll_get_configure_from_opts(dsi, &phy_cfg.mipi_dphy, &cfg);
+ if (ret < 0) {
+ DRM_DEV_DEBUG_DRIVER(dev, "failed to get phy pll cfg %d\n", ret);
+ return MODE_NOCLOCK;
+ }
+
+ return MODE_OK;
+}
+
+static enum drm_mode_status
+imx93_dsi_mode_valid(void *priv_data, const struct drm_display_mode *mode,
+ unsigned long mode_flags, u32 lanes, u32 format)
+{
+ struct imx93_dsi *dsi = priv_data;
+ struct device *dev = dsi->dev;
+ enum drm_mode_status ret;
+
+ ret = imx93_dsi_validate_mode(dsi, mode);
+ if (ret != MODE_OK) {
+ DRM_DEV_DEBUG_DRIVER(dev, "failed to validate mode " DRM_MODE_FMT "\n",
+ DRM_MODE_ARG(mode));
+ return ret;
+ }
+
+ ret = imx93_dsi_validate_phy(dsi, mode, mode_flags, lanes, format);
+ if (ret != MODE_OK) {
+ DRM_DEV_DEBUG_DRIVER(dev,
+ "failed to validate phy for mode " DRM_MODE_FMT "\n",
+ DRM_MODE_ARG(mode));
+ return ret;
+ }
+
+ return MODE_OK;
+}
+
+static bool imx93_dsi_mode_fixup(void *priv_data,
+ const struct drm_display_mode *mode,
+ struct drm_display_mode *adjusted_mode)
+{
+ struct imx93_dsi *dsi = priv_data;
+ unsigned long pixel_clock_rate;
+ unsigned long rounded_rate;
+
+ pixel_clock_rate = mode->clock * 1000;
+ rounded_rate = clk_round_rate(dsi->clk_pixel, pixel_clock_rate);
+
+ memcpy(adjusted_mode, mode, sizeof(*mode));
+ adjusted_mode->clock = rounded_rate / 1000;
+
+ DRM_DEV_DEBUG_DRIVER(dsi->dev, "adj clock %d for mode " DRM_MODE_FMT "\n",
+ adjusted_mode->clock, DRM_MODE_ARG(mode));
+
+ return true;
+}
+
+static u32 *imx93_dsi_get_input_bus_fmts(void *priv_data,
+ struct drm_bridge *bridge,
+ struct drm_bridge_state *bridge_state,
+ struct drm_crtc_state *crtc_state,
+ struct drm_connector_state *conn_state,
+ u32 output_fmt,
+ unsigned int *num_input_fmts)
+{
+ u32 *input_fmts, input_fmt;
+
+ *num_input_fmts = 0;
+
+ switch (output_fmt) {
+ case MEDIA_BUS_FMT_RGB888_1X24:
+ case MEDIA_BUS_FMT_RGB666_1X18:
+ case MEDIA_BUS_FMT_FIXED:
+ input_fmt = MEDIA_BUS_FMT_RGB888_1X24;
+ break;
+ case MEDIA_BUS_FMT_RGB565_1X16:
+ input_fmt = output_fmt;
+ break;
+ default:
+ return NULL;
+ }
+
+ input_fmts = kmalloc(sizeof(*input_fmts), GFP_KERNEL);
+ if (!input_fmts)
+ return NULL;
+ input_fmts[0] = input_fmt;
+ *num_input_fmts = 1;
+
+ return input_fmts;
+}
+
+static int imx93_dsi_phy_init(void *priv_data)
+{
+ struct imx93_dsi *dsi = priv_data;
+ unsigned int fmt = 0;
+ int ret;
+
+ switch (dsi->format) {
+ case MIPI_DSI_FMT_RGB888:
+ fmt = RGB888_TO_RGB888;
+ break;
+ case MIPI_DSI_FMT_RGB666:
+ fmt = RGB888_TO_RGB666;
+ regmap_update_bits(dsi->regmap, DISPLAY_MUX,
+ MIPI_DSI_RGB666_MAP_CFG, RGB666_CONFIG2);
+ break;
+ case MIPI_DSI_FMT_RGB666_PACKED:
+ fmt = RGB888_TO_RGB666;
+ regmap_update_bits(dsi->regmap, DISPLAY_MUX,
+ MIPI_DSI_RGB666_MAP_CFG, RGB666_CONFIG1);
+ break;
+ case MIPI_DSI_FMT_RGB565:
+ fmt = RGB565_TO_RGB565;
+ regmap_update_bits(dsi->regmap, DISPLAY_MUX,
+ MIPI_DSI_RGB565_MAP_CFG, RGB565_CONFIG1);
+ break;
+ }
+
+ regmap_update_bits(dsi->regmap, DISPLAY_MUX, LCDIF_CROSS_LINE_PATTERN, fmt);
+
+ ret = dphy_pll_init(dsi);
+ if (ret < 0) {
+ DRM_DEV_ERROR(dsi->dev, "failed to init phy: %d\n", ret);
+ return ret;
+ }
+
+ ret = dphy_pll_configure(dsi, &dsi->phy_cfg);
+ if (ret < 0) {
+ DRM_DEV_ERROR(dsi->dev, "failed to configure phy: %d\n", ret);
+ dphy_pll_uninit(dsi);
+ return ret;
+ }
+
+ return 0;
+}
+
+static void imx93_dsi_phy_power_off(void *priv_data)
+{
+ struct imx93_dsi *dsi = priv_data;
+
+ dphy_pll_power_off(dsi);
+ dphy_pll_uninit(dsi);
+}
+
+static int
+imx93_dsi_get_lane_mbps(void *priv_data, const struct drm_display_mode *mode,
+ unsigned long mode_flags, u32 lanes, u32 format,
+ unsigned int *lane_mbps)
+{
+ struct imx93_dsi *dsi = priv_data;
+ union phy_configure_opts phy_cfg;
+ struct device *dev = dsi->dev;
+ int ret;
+
+ ret = imx93_dsi_get_phy_configure_opts(dsi, mode, &phy_cfg, lanes,
+ format);
+ if (ret < 0) {
+ DRM_DEV_DEBUG_DRIVER(dev, "failed to get phy cfg opts %d\n", ret);
+ return ret;
+ }
+
+ *lane_mbps = DIV_ROUND_UP(phy_cfg.mipi_dphy.hs_clk_rate, USEC_PER_SEC);
+
+ memcpy(&dsi->phy_cfg, &phy_cfg, sizeof(phy_cfg));
+
+ DRM_DEV_DEBUG_DRIVER(dev, "get lane_mbps %u for mode " DRM_MODE_FMT "\n",
+ *lane_mbps, DRM_MODE_ARG(mode));
+
+ return 0;
+}
+
+/* High-Speed Transition Times */
+struct hstt {
+ unsigned int maxfreq;
+ struct dw_mipi_dsi_dphy_timing timing;
+};
+
+#define HSTT(_maxfreq, _c_lp2hs, _c_hs2lp, _d_lp2hs, _d_hs2lp) \
+{ \
+ .maxfreq = (_maxfreq), \
+ .timing = { \
+ .clk_lp2hs = (_c_lp2hs), \
+ .clk_hs2lp = (_c_hs2lp), \
+ .data_lp2hs = (_d_lp2hs), \
+ .data_hs2lp = (_d_hs2lp), \
+ } \
+}
+
+/* DPHY Databook Table A-4 High-Speed Transition Times */
+static const struct hstt hstt_table[] = {
+ HSTT(80, 21, 17, 15, 10),
+ HSTT(90, 23, 17, 16, 10),
+ HSTT(100, 22, 17, 16, 10),
+ HSTT(110, 25, 18, 17, 11),
+ HSTT(120, 26, 20, 18, 11),
+ HSTT(130, 27, 19, 19, 11),
+ HSTT(140, 27, 19, 19, 11),
+ HSTT(150, 28, 20, 20, 12),
+ HSTT(160, 30, 21, 22, 13),
+ HSTT(170, 30, 21, 23, 13),
+ HSTT(180, 31, 21, 23, 13),
+ HSTT(190, 32, 22, 24, 13),
+ HSTT(205, 35, 22, 25, 13),
+ HSTT(220, 37, 26, 27, 15),
+ HSTT(235, 38, 28, 27, 16),
+ HSTT(250, 41, 29, 30, 17),
+ HSTT(275, 43, 29, 32, 18),
+ HSTT(300, 45, 32, 35, 19),
+ HSTT(325, 48, 33, 36, 18),
+ HSTT(350, 51, 35, 40, 20),
+ HSTT(400, 59, 37, 44, 21),
+ HSTT(450, 65, 40, 49, 23),
+ HSTT(500, 71, 41, 54, 24),
+ HSTT(550, 77, 44, 57, 26),
+ HSTT(600, 82, 46, 64, 27),
+ HSTT(650, 87, 48, 67, 28),
+ HSTT(700, 94, 52, 71, 29),
+ HSTT(750, 99, 52, 75, 31),
+ HSTT(800, 105, 55, 82, 32),
+ HSTT(850, 110, 58, 85, 32),
+ HSTT(900, 115, 58, 88, 35),
+ HSTT(950, 120, 62, 93, 36),
+ HSTT(1000, 128, 63, 99, 38),
+ HSTT(1050, 132, 65, 102, 38),
+ HSTT(1100, 138, 67, 106, 39),
+ HSTT(1150, 146, 69, 112, 42),
+ HSTT(1200, 151, 71, 117, 43),
+ HSTT(1250, 153, 74, 120, 45),
+ HSTT(1300, 160, 73, 124, 46),
+ HSTT(1350, 165, 76, 130, 47),
+ HSTT(1400, 172, 78, 134, 49),
+ HSTT(1450, 177, 80, 138, 49),
+ HSTT(1500, 183, 81, 143, 52),
+ HSTT(1550, 191, 84, 147, 52),
+ HSTT(1600, 194, 85, 152, 52),
+ HSTT(1650, 201, 86, 155, 53),
+ HSTT(1700, 208, 88, 161, 53),
+ HSTT(1750, 212, 89, 165, 53),
+ HSTT(1800, 220, 90, 171, 54),
+ HSTT(1850, 223, 92, 175, 54),
+ HSTT(1900, 231, 91, 180, 55),
+ HSTT(1950, 236, 95, 185, 56),
+ HSTT(2000, 243, 97, 190, 56),
+ HSTT(2050, 248, 99, 194, 58),
+ HSTT(2100, 252, 100, 199, 59),
+ HSTT(2150, 259, 102, 204, 61),
+ HSTT(2200, 266, 105, 210, 62),
+ HSTT(2250, 269, 109, 213, 63),
+ HSTT(2300, 272, 109, 217, 65),
+ HSTT(2350, 281, 112, 225, 66),
+ HSTT(2400, 283, 115, 226, 66),
+ HSTT(2450, 282, 115, 226, 67),
+ HSTT(2500, 281, 118, 227, 67),
+};
+
+static int imx93_dsi_phy_get_timing(void *priv_data, unsigned int lane_mbps,
+ struct dw_mipi_dsi_dphy_timing *timing)
+{
+ struct imx93_dsi *dsi = priv_data;
+ struct device *dev = dsi->dev;
+ int i;
+
+ for (i = 0; i < ARRAY_SIZE(hstt_table); i++)
+ if (lane_mbps <= hstt_table[i].maxfreq)
+ break;
+
+ if (i == ARRAY_SIZE(hstt_table)) {
+ DRM_DEV_ERROR(dev, "failed to get phy timing for lane_mbps %u\n",
+ lane_mbps);
+ return -EINVAL;
+ }
+
+ *timing = hstt_table[i].timing;
+
+ DRM_DEV_DEBUG_DRIVER(dev, "get phy timing for %u <= %u (lane_mbps)\n",
+ lane_mbps, hstt_table[i].maxfreq);
+
+ return 0;
+}
+
+static const struct dw_mipi_dsi_phy_ops imx93_dsi_phy_ops = {
+ .init = imx93_dsi_phy_init,
+ .power_off = imx93_dsi_phy_power_off,
+ .get_lane_mbps = imx93_dsi_get_lane_mbps,
+ .get_timing = imx93_dsi_phy_get_timing,
+};
+
+static int imx93_dsi_host_attach(void *priv_data, struct mipi_dsi_device *device)
+{
+ struct imx93_dsi *dsi = priv_data;
+
+ dsi->format = device->format;
+
+ return 0;
+}
+
+static const struct dw_mipi_dsi_host_ops imx93_dsi_host_ops = {
+ .attach = imx93_dsi_host_attach,
+};
+
+static int imx93_dsi_probe(struct platform_device *pdev)
+{
+ struct device *dev = &pdev->dev;
+ struct device_node *np = dev->of_node;
+ struct imx93_dsi *dsi;
+ int ret;
+
+ dsi = devm_kzalloc(dev, sizeof(*dsi), GFP_KERNEL);
+ if (!dsi)
+ return -ENOMEM;
+
+ dsi->regmap = syscon_regmap_lookup_by_phandle(np, "fsl,media-blk-ctrl");
+ if (IS_ERR(dsi->regmap)) {
+ ret = PTR_ERR(dsi->regmap);
+ DRM_DEV_ERROR(dev, "failed to get block ctrl regmap: %d\n", ret);
+ return ret;
+ }
+
+ dsi->clk_pixel = devm_clk_get(dev, "pix");
+ if (IS_ERR(dsi->clk_pixel)) {
+ ret = PTR_ERR(dsi->clk_pixel);
+ if (ret != -EPROBE_DEFER)
+ DRM_DEV_ERROR(dev, "failed to get pixel clock: %d\n", ret);
+ return ret;
+ }
+
+ dsi->clk_cfg = devm_clk_get(dev, "phy_cfg");
+ if (IS_ERR(dsi->clk_cfg)) {
+ ret = PTR_ERR(dsi->clk_cfg);
+ if (ret != -EPROBE_DEFER)
+ DRM_DEV_ERROR(dev, "failed to get phy cfg clock: %d\n", ret);
+ return ret;
+ }
+
+ dsi->clk_ref = devm_clk_get(dev, "phy_ref");
+ if (IS_ERR(dsi->clk_ref)) {
+ ret = PTR_ERR(dsi->clk_ref);
+ if (ret != -EPROBE_DEFER)
+ DRM_DEV_ERROR(dev, "failed to get phy ref clock: %d\n", ret);
+ return ret;
+ }
+
+ dsi->ref_clk_rate = clk_get_rate(dsi->clk_ref);
+ if (dsi->ref_clk_rate < REF_CLK_RATE_MIN ||
+ dsi->ref_clk_rate > REF_CLK_RATE_MAX) {
+ DRM_DEV_ERROR(dev, "invalid phy ref clock rate %lu\n",
+ dsi->ref_clk_rate);
+ return -EINVAL;
+ }
+ DRM_DEV_DEBUG_DRIVER(dev, "phy ref clock rate: %lu\n", dsi->ref_clk_rate);
+
+ dsi->dev = dev;
+ dsi->pdata.max_data_lanes = 4;
+ dsi->pdata.mode_valid = imx93_dsi_mode_valid;
+ dsi->pdata.mode_fixup = imx93_dsi_mode_fixup;
+ dsi->pdata.get_input_bus_fmts = imx93_dsi_get_input_bus_fmts;
+ dsi->pdata.phy_ops = &imx93_dsi_phy_ops;
+ dsi->pdata.host_ops = &imx93_dsi_host_ops;
+ dsi->pdata.priv_data = dsi;
+ platform_set_drvdata(pdev, dsi);
+
+ dsi->dmd = dw_mipi_dsi_probe(pdev, &dsi->pdata);
+ if (IS_ERR(dsi->dmd)) {
+ ret = PTR_ERR(dsi->dmd);
+ if (ret != -EPROBE_DEFER)
+ DRM_DEV_ERROR(dev, "failed to probe dw_mipi_dsi: %d\n", ret);
+ return ret;
+ }
+
+ return 0;
+}
+
+static void imx93_dsi_remove(struct platform_device *pdev)
+{
+ struct imx93_dsi *dsi = platform_get_drvdata(pdev);
+
+ dw_mipi_dsi_remove(dsi->dmd);
+}
+
+static const struct of_device_id imx93_dsi_dt_ids[] = {
+ { .compatible = "fsl,imx93-mipi-dsi", },
+ { /* sentinel */ }
+};
+MODULE_DEVICE_TABLE(of, imx93_dsi_dt_ids);
+
+static struct platform_driver imx93_dsi_driver = {
+ .probe = imx93_dsi_probe,
+ .remove_new = imx93_dsi_remove,
+ .driver = {
+ .of_match_table = imx93_dsi_dt_ids,
+ .name = "imx93_mipi_dsi",
+ },
+};
+module_platform_driver(imx93_dsi_driver);
+
+MODULE_DESCRIPTION("Freescale i.MX93 MIPI DSI driver");
+MODULE_AUTHOR("Liu Ying <victor.liu@nxp.com>");
+MODULE_LICENSE("GPL");
--
2.37.1