[PATCH v2 2/2] drm: rcar-du: Add R-Car DSI driver
Laurent Pinchart
laurent.pinchart+renesas at ideasonboard.com
Wed Jun 23 13:56:39 UTC 2021
From: LUU HOAI <hoai.luu.ub at renesas.com>
The driver supports the MIPI DSI/CSI-2 TX encoder found in the R-Car V3U
SoC. It currently supports DSI mode only.
Signed-off-by: LUU HOAI <hoai.luu.ub at renesas.com>
Signed-off-by: Laurent Pinchart <laurent.pinchart+renesas at ideasonboard.com>
Reviewed-by: Kieran Bingham <kieran.bingham+renesas at ideasonboard.com>
Tested-by: Kieran Bingham <kieran.bingham+renesas at ideasonboard.com>
---
drivers/gpu/drm/rcar-du/Kconfig | 6 +
drivers/gpu/drm/rcar-du/Makefile | 1 +
drivers/gpu/drm/rcar-du/rcar_mipi_dsi.c | 827 +++++++++++++++++++
drivers/gpu/drm/rcar-du/rcar_mipi_dsi_regs.h | 172 ++++
4 files changed, 1006 insertions(+)
create mode 100644 drivers/gpu/drm/rcar-du/rcar_mipi_dsi.c
create mode 100644 drivers/gpu/drm/rcar-du/rcar_mipi_dsi_regs.h
diff --git a/drivers/gpu/drm/rcar-du/Kconfig b/drivers/gpu/drm/rcar-du/Kconfig
index b47e74421e34..8cb94fe90639 100644
--- a/drivers/gpu/drm/rcar-du/Kconfig
+++ b/drivers/gpu/drm/rcar-du/Kconfig
@@ -38,6 +38,12 @@ config DRM_RCAR_LVDS
help
Enable support for the R-Car Display Unit embedded LVDS encoders.
+config DRM_RCAR_MIPI_DSI
+ tristate "R-Car DU MIPI DSI Encoder Support"
+ depends on DRM && DRM_BRIDGE && OF
+ help
+ Enable support for the R-Car Display Unit embedded MIPI DSI encoders.
+
config DRM_RCAR_VSP
bool "R-Car DU VSP Compositor Support" if ARM
default y if ARM64
diff --git a/drivers/gpu/drm/rcar-du/Makefile b/drivers/gpu/drm/rcar-du/Makefile
index 4d1187ccc3e5..adc1b49d02cf 100644
--- a/drivers/gpu/drm/rcar-du/Makefile
+++ b/drivers/gpu/drm/rcar-du/Makefile
@@ -19,6 +19,7 @@ obj-$(CONFIG_DRM_RCAR_CMM) += rcar_cmm.o
obj-$(CONFIG_DRM_RCAR_DU) += rcar-du-drm.o
obj-$(CONFIG_DRM_RCAR_DW_HDMI) += rcar_dw_hdmi.o
obj-$(CONFIG_DRM_RCAR_LVDS) += rcar_lvds.o
+obj-$(CONFIG_DRM_RCAR_MIPI_DSI) += rcar_mipi_dsi.o
# 'remote-endpoint' is fixed up at run-time
DTC_FLAGS_rcar_du_of_lvds_r8a7790 += -Wno-graph_endpoint
diff --git a/drivers/gpu/drm/rcar-du/rcar_mipi_dsi.c b/drivers/gpu/drm/rcar-du/rcar_mipi_dsi.c
new file mode 100644
index 000000000000..e94245029f95
--- /dev/null
+++ b/drivers/gpu/drm/rcar-du/rcar_mipi_dsi.c
@@ -0,0 +1,827 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * rcar_mipi_dsi.c -- R-Car MIPI DSI Encoder
+ *
+ * Copyright (C) 2020 Renesas Electronics Corporation
+ */
+
+#include <linux/clk.h>
+#include <linux/delay.h>
+#include <linux/io.h>
+#include <linux/iopoll.h>
+#include <linux/module.h>
+#include <linux/of.h>
+#include <linux/of_device.h>
+#include <linux/of_graph.h>
+#include <linux/platform_device.h>
+#include <linux/reset.h>
+#include <linux/slab.h>
+
+#include <drm/drm_atomic.h>
+#include <drm/drm_atomic_helper.h>
+#include <drm/drm_bridge.h>
+#include <drm/drm_mipi_dsi.h>
+#include <drm/drm_of.h>
+#include <drm/drm_panel.h>
+#include <drm/drm_probe_helper.h>
+
+#include "rcar_mipi_dsi_regs.h"
+
+struct rcar_mipi_dsi {
+ struct device *dev;
+ const struct rcar_mipi_dsi_device_info *info;
+ struct reset_control *rstc;
+
+ struct mipi_dsi_host host;
+ struct drm_bridge bridge;
+ struct drm_bridge *next_bridge;
+ struct drm_connector connector;
+
+ void __iomem *mmio;
+ struct {
+ struct clk *mod;
+ struct clk *pll;
+ struct clk *dsi;
+ } clocks;
+
+ struct drm_display_mode display_mode;
+ enum mipi_dsi_pixel_format format;
+ unsigned int num_data_lanes;
+ unsigned int lanes;
+};
+
+static inline struct rcar_mipi_dsi *
+bridge_to_rcar_mipi_dsi(struct drm_bridge *bridge)
+{
+ return container_of(bridge, struct rcar_mipi_dsi, bridge);
+}
+
+static inline struct rcar_mipi_dsi *
+host_to_rcar_mipi_dsi(struct mipi_dsi_host *host)
+{
+ return container_of(host, struct rcar_mipi_dsi, host);
+}
+
+static const u32 phtw[] = {
+ 0x01020114, 0x01600115, /* General testing */
+ 0x01030116, 0x0102011d, /* General testing */
+ 0x011101a4, 0x018601a4, /* 1Gbps testing */
+ 0x014201a0, 0x010001a3, /* 1Gbps testing */
+ 0x0101011f, /* 1Gbps testing */
+};
+
+static const u32 phtw2[] = {
+ 0x010c0130, 0x010c0140, /* General testing */
+ 0x010c0150, 0x010c0180, /* General testing */
+ 0x010c0190,
+ 0x010a0160, 0x010a0170,
+ 0x01800164, 0x01800174, /* 1Gbps testing */
+};
+
+static const u32 hsfreqrange_table[][2] = {
+ { 80000000, 0x00 }, { 90000000, 0x10 }, { 100000000, 0x20 },
+ { 110000000, 0x30 }, { 120000000, 0x01 }, { 130000000, 0x11 },
+ { 140000000, 0x21 }, { 150000000, 0x31 }, { 160000000, 0x02 },
+ { 170000000, 0x12 }, { 180000000, 0x22 }, { 190000000, 0x32 },
+ { 205000000, 0x03 }, { 220000000, 0x13 }, { 235000000, 0x23 },
+ { 250000000, 0x33 }, { 275000000, 0x04 }, { 300000000, 0x14 },
+ { 325000000, 0x25 }, { 350000000, 0x35 }, { 400000000, 0x05 },
+ { 450000000, 0x16 }, { 500000000, 0x26 }, { 550000000, 0x37 },
+ { 600000000, 0x07 }, { 650000000, 0x18 }, { 700000000, 0x28 },
+ { 750000000, 0x39 }, { 800000000, 0x09 }, { 850000000, 0x19 },
+ { 900000000, 0x29 }, { 950000000, 0x3a }, { 1000000000, 0x0a },
+ { 1050000000, 0x1a }, { 1100000000, 0x2a }, { 1150000000, 0x3b },
+ { 1200000000, 0x0b }, { 1250000000, 0x1b }, { 1300000000, 0x2b },
+ { 1350000000, 0x3c }, { 1400000000, 0x0c }, { 1450000000, 0x1c },
+ { 1500000000, 0x2c }, { 1550000000, 0x3d }, { 1600000000, 0x0d },
+ { 1650000000, 0x1d }, { 1700000000, 0x2e }, { 1750000000, 0x3e },
+ { 1800000000, 0x0e }, { 1850000000, 0x1e }, { 1900000000, 0x2f },
+ { 1950000000, 0x3f }, { 2000000000, 0x0f }, { 2050000000, 0x40 },
+ { 2100000000, 0x41 }, { 2150000000, 0x42 }, { 2200000000, 0x43 },
+ { 2250000000, 0x44 }, { 2300000000, 0x45 }, { 2350000000, 0x46 },
+ { 2400000000, 0x47 }, { 2450000000, 0x48 }, { 2500000000, 0x49 },
+ { /* sentinel */ },
+};
+
+struct vco_cntrl_value {
+ u32 min_freq;
+ u32 max_freq;
+ u16 value;
+};
+
+static const struct vco_cntrl_value vco_cntrl_table[] = {
+ { .min_freq = 40000000, .max_freq = 55000000, .value = 0x3f },
+ { .min_freq = 52500000, .max_freq = 80000000, .value = 0x39 },
+ { .min_freq = 80000000, .max_freq = 110000000, .value = 0x2f },
+ { .min_freq = 105000000, .max_freq = 160000000, .value = 0x29 },
+ { .min_freq = 160000000, .max_freq = 220000000, .value = 0x1f },
+ { .min_freq = 210000000, .max_freq = 320000000, .value = 0x19 },
+ { .min_freq = 320000000, .max_freq = 440000000, .value = 0x0f },
+ { .min_freq = 420000000, .max_freq = 660000000, .value = 0x09 },
+ { .min_freq = 630000000, .max_freq = 1149000000, .value = 0x03 },
+ { .min_freq = 1100000000, .max_freq = 1152000000, .value = 0x01 },
+ { .min_freq = 1150000000, .max_freq = 1250000000, .value = 0x01 },
+ { /* sentinel */ },
+};
+
+static void rcar_mipi_dsi_write(struct rcar_mipi_dsi *dsi, u32 reg, u32 data)
+{
+ iowrite32(data, dsi->mmio + reg);
+}
+
+static u32 rcar_mipi_dsi_read(struct rcar_mipi_dsi *dsi, u32 reg)
+{
+ return ioread32(dsi->mmio + reg);
+}
+
+static void rcar_mipi_dsi_clr(struct rcar_mipi_dsi *dsi, u32 reg, u32 clr)
+{
+ rcar_mipi_dsi_write(dsi, reg, rcar_mipi_dsi_read(dsi, reg) & ~clr);
+}
+
+static void rcar_mipi_dsi_set(struct rcar_mipi_dsi *dsi, u32 reg, u32 set)
+{
+ rcar_mipi_dsi_write(dsi, reg, rcar_mipi_dsi_read(dsi, reg) | set);
+}
+
+static int rcar_mipi_dsi_phtw_test(struct rcar_mipi_dsi *dsi, u32 phtw)
+{
+ u32 status;
+ int ret;
+
+ rcar_mipi_dsi_write(dsi, PHTW, phtw);
+
+ ret = read_poll_timeout(rcar_mipi_dsi_read, status,
+ !(status & (PHTW_DWEN | PHTW_CWEN)),
+ 2000, 10000, false, dsi, PHTW);
+ if (ret < 0) {
+ dev_err(dsi->dev, "PHY test interface write timeout (0x%08x)\n",
+ phtw);
+ return ret;
+ }
+
+ return ret;
+}
+
+/* -----------------------------------------------------------------------------
+ * Hardware Setup
+ */
+
+struct dsi_setup_info {
+ unsigned int err;
+ u16 vco_cntrl;
+ u16 prop_cntrl;
+ u16 hsfreqrange;
+ u16 div;
+ unsigned int m;
+ unsigned int n;
+};
+
+static void rcar_mipi_dsi_parameters_calc(struct rcar_mipi_dsi *dsi,
+ struct clk *clk, unsigned long target,
+ struct dsi_setup_info *setup_info)
+{
+
+ const struct vco_cntrl_value *vco_cntrl;
+ unsigned long fout_target;
+ unsigned long fin, fout;
+ unsigned long hsfreq;
+ unsigned int divider;
+ unsigned int n;
+ unsigned int i;
+ unsigned int err;
+
+ /*
+ * Calculate Fout = dot clock * ColorDepth / (2 * Lane Count)
+ * The range out Fout is [40 - 1250] Mhz
+ */
+ fout_target = target * mipi_dsi_pixel_format_to_bpp(dsi->format)
+ / (2 * dsi->lanes);
+ if (fout_target < 40000000 || fout_target > 1250000000)
+ return;
+
+ /* Find vco_cntrl */
+ for (vco_cntrl = vco_cntrl_table; vco_cntrl->min_freq != 0; vco_cntrl++) {
+ if (fout_target > vco_cntrl->min_freq &&
+ fout_target <= vco_cntrl->max_freq) {
+ setup_info->vco_cntrl = vco_cntrl->value;
+ if (fout_target >= 1150000000)
+ setup_info->prop_cntrl = 0x0c;
+ else
+ setup_info->prop_cntrl = 0x0b;
+ break;
+ }
+ }
+
+ /* Add divider */
+ setup_info->div = (setup_info->vco_cntrl & 0x30) >> 4;
+
+ /* Find hsfreqrange */
+ hsfreq = fout_target * 2;
+ for (i = 0; i < ARRAY_SIZE(hsfreqrange_table); i++) {
+ if (hsfreq > hsfreqrange_table[i][0] &&
+ hsfreq <= hsfreqrange_table[i+1][0]) {
+ setup_info->hsfreqrange = hsfreqrange_table[i+1][1];
+ break;
+ }
+ }
+
+ /*
+ * Calculate n and m for PLL clock
+ * Following the HW manual the ranges of n and m are
+ * n = [3-8] and m = [64-625]
+ */
+ fin = clk_get_rate(clk);
+ divider = 1 << setup_info->div;
+ for (n = 3; n < 9; n++) {
+ unsigned long fpfd;
+ unsigned int m;
+
+ fpfd = fin / n;
+
+ for (m = 64; m < 626; m++) {
+ fout = fpfd * m / divider;
+ err = abs((long)(fout - fout_target) * 10000 /
+ (long)fout_target);
+ if (err < setup_info->err) {
+ setup_info->m = m - 2;
+ setup_info->n = n - 1;
+ setup_info->err = err;
+ if (err == 0)
+ goto done;
+ }
+ }
+ }
+
+done:
+ dev_dbg(dsi->dev,
+ "%pC %lu Hz -> Fout %lu Hz (target %lu Hz, error %d.%02u%%), PLL M/N/DIV %u/%u/%u\n",
+ clk, fin, fout, fout_target, setup_info->err / 100,
+ setup_info->err % 100, setup_info->m,
+ setup_info->n, setup_info->div);
+ dev_dbg(dsi->dev,
+ "vco_cntrl = 0x%x\tprop_cntrl = 0x%x\thsfreqrange = 0x%x\n",
+ setup_info->vco_cntrl,
+ setup_info->prop_cntrl,
+ setup_info->hsfreqrange);
+}
+
+static void rcar_mipi_dsi_set_display_timing(struct rcar_mipi_dsi *dsi)
+{
+ struct drm_display_mode *mode = &dsi->display_mode;
+ u32 setr;
+ u32 vprmset0r;
+ u32 vprmset1r;
+ u32 vprmset2r;
+ u32 vprmset3r;
+ u32 vprmset4r;
+
+ /* Configuration for Pixel Stream and Packet Header */
+ if (mipi_dsi_pixel_format_to_bpp(dsi->format) == 24)
+ rcar_mipi_dsi_write(dsi, TXVMPSPHSETR, TXVMPSPHSETR_DT_RGB24);
+ else if (mipi_dsi_pixel_format_to_bpp(dsi->format) == 18)
+ rcar_mipi_dsi_write(dsi, TXVMPSPHSETR, TXVMPSPHSETR_DT_RGB18);
+ else if (mipi_dsi_pixel_format_to_bpp(dsi->format) == 16)
+ rcar_mipi_dsi_write(dsi, TXVMPSPHSETR, TXVMPSPHSETR_DT_RGB16);
+ else {
+ dev_warn(dsi->dev, "unsupported format");
+ return;
+ }
+
+ /* Configuration for Blanking sequence and Input Pixel */
+ setr = TXVMSETR_HSABPEN_EN | TXVMSETR_HBPBPEN_EN
+ | TXVMSETR_HFPBPEN_EN | TXVMSETR_SYNSEQ_PULSES
+ | TXVMSETR_PIXWDTH | TXVMSETR_VSTPM;
+ rcar_mipi_dsi_write(dsi, TXVMSETR, setr);
+
+ /* Configuration for Video Parameters */
+ vprmset0r = (mode->flags & DRM_MODE_FLAG_PVSYNC ?
+ TXVMVPRMSET0R_VSPOL_HIG : TXVMVPRMSET0R_VSPOL_LOW)
+ | (mode->flags & DRM_MODE_FLAG_PHSYNC ?
+ TXVMVPRMSET0R_HSPOL_HIG : TXVMVPRMSET0R_HSPOL_LOW)
+ | TXVMVPRMSET0R_CSPC_RGB | TXVMVPRMSET0R_BPP_24;
+
+ vprmset1r = TXVMVPRMSET1R_VACTIVE(mode->vdisplay)
+ | TXVMVPRMSET1R_VSA(mode->vsync_end - mode->vsync_start);
+
+ vprmset2r = TXVMVPRMSET2R_VFP(mode->vsync_start - mode->vdisplay)
+ | TXVMVPRMSET2R_VBP(mode->vtotal - mode->vsync_end);
+
+ vprmset3r = TXVMVPRMSET3R_HACTIVE(mode->hdisplay)
+ | TXVMVPRMSET3R_HSA(mode->hsync_end - mode->hsync_start);
+
+ vprmset4r = TXVMVPRMSET4R_HFP(mode->hsync_start - mode->hdisplay)
+ | TXVMVPRMSET4R_HBP(mode->htotal - mode->hsync_end);
+
+ rcar_mipi_dsi_write(dsi, TXVMVPRMSET0R, vprmset0r);
+ rcar_mipi_dsi_write(dsi, TXVMVPRMSET1R, vprmset1r);
+ rcar_mipi_dsi_write(dsi, TXVMVPRMSET2R, vprmset2r);
+ rcar_mipi_dsi_write(dsi, TXVMVPRMSET3R, vprmset3r);
+ rcar_mipi_dsi_write(dsi, TXVMVPRMSET4R, vprmset4r);
+}
+
+static int rcar_mipi_dsi_startup(struct rcar_mipi_dsi *dsi)
+{
+ struct drm_display_mode *mode = &dsi->display_mode;
+ struct dsi_setup_info setup_info = {.err = -1 };
+ unsigned int timeout;
+ int ret, i;
+ int dsi_format;
+ u32 phy_setup;
+ u32 clockset2, clockset3;
+ u32 ppisetr;
+ u32 vclkset;
+
+ /* Checking valid format */
+ dsi_format = mipi_dsi_pixel_format_to_bpp(dsi->format);
+ if (dsi_format < 0) {
+ dev_warn(dsi->dev, "invalid format");
+ return -EINVAL;
+ }
+
+ /* Parameters Calculation */
+ rcar_mipi_dsi_parameters_calc(dsi, dsi->clocks.pll,
+ mode->clock * 1000, &setup_info);
+
+ /* LPCLK enable */
+ rcar_mipi_dsi_set(dsi, LPCLKSET, LPCLKSET_CKEN);
+
+ /* CFGCLK enabled */
+ rcar_mipi_dsi_set(dsi, CFGCLKSET, CFGCLKSET_CKEN);
+
+ rcar_mipi_dsi_clr(dsi, PHYSETUP, PHYSETUP_RSTZ);
+ rcar_mipi_dsi_clr(dsi, PHYSETUP, PHYSETUP_SHUTDOWNZ);
+
+ rcar_mipi_dsi_set(dsi, PHTC, PHTC_TESTCLR);
+ rcar_mipi_dsi_clr(dsi, PHTC, PHTC_TESTCLR);
+
+ /* PHY setting */
+ phy_setup = rcar_mipi_dsi_read(dsi, PHYSETUP);
+ phy_setup &= ~PHYSETUP_HSFREQRANGE_MASK;
+ phy_setup |= PHYSETUP_HSFREQRANGE(setup_info.hsfreqrange);
+ rcar_mipi_dsi_write(dsi, PHYSETUP, phy_setup);
+
+ for (i = 0; i < ARRAY_SIZE(phtw); i++) {
+ ret = rcar_mipi_dsi_phtw_test(dsi, phtw[i]);
+ if (ret < 0)
+ return ret;
+ }
+
+ /* PLL Clock Setting */
+ rcar_mipi_dsi_clr(dsi, CLOCKSET1, CLOCKSET1_SHADOW_CLEAR);
+ rcar_mipi_dsi_set(dsi, CLOCKSET1, CLOCKSET1_SHADOW_CLEAR);
+ rcar_mipi_dsi_clr(dsi, CLOCKSET1, CLOCKSET1_SHADOW_CLEAR);
+
+ clockset2 = CLOCKSET2_M(setup_info.m) | CLOCKSET2_N(setup_info.n)
+ | CLOCKSET2_VCO_CNTRL(setup_info.vco_cntrl);
+ clockset3 = CLOCKSET3_PROP_CNTRL(setup_info.prop_cntrl)
+ | CLOCKSET3_INT_CNTRL(0)
+ | CLOCKSET3_CPBIAS_CNTRL(0x10)
+ | CLOCKSET3_GMP_CNTRL(1);
+ rcar_mipi_dsi_write(dsi, CLOCKSET2, clockset2);
+ rcar_mipi_dsi_write(dsi, CLOCKSET3, clockset3);
+
+ rcar_mipi_dsi_clr(dsi, CLOCKSET1, CLOCKSET1_UPDATEPLL);
+ rcar_mipi_dsi_set(dsi, CLOCKSET1, CLOCKSET1_UPDATEPLL);
+ udelay(10);
+ rcar_mipi_dsi_clr(dsi, CLOCKSET1, CLOCKSET1_UPDATEPLL);
+
+ ppisetr = PPISETR_DLEN_3 | PPISETR_CLEN;
+ rcar_mipi_dsi_write(dsi, PPISETR, ppisetr);
+
+ rcar_mipi_dsi_set(dsi, PHYSETUP, PHYSETUP_SHUTDOWNZ);
+ rcar_mipi_dsi_set(dsi, PHYSETUP, PHYSETUP_RSTZ);
+ usleep_range(400, 500);
+
+ /* Checking PPI clock status register */
+ for (timeout = 10; timeout > 0; --timeout) {
+ if ((rcar_mipi_dsi_read(dsi, PPICLSR) & PPICLSR_STPST) &&
+ (rcar_mipi_dsi_read(dsi, PPIDLSR) & PPIDLSR_STPST) &&
+ (rcar_mipi_dsi_read(dsi, CLOCKSET1) & CLOCKSET1_LOCK))
+ break;
+
+ usleep_range(1000, 2000);
+ }
+
+ if (!timeout) {
+ dev_err(dsi->dev, "failed to enable PPI clock\n");
+ return -ETIMEDOUT;
+ }
+
+ for (i = 0; i < ARRAY_SIZE(phtw2); i++) {
+ ret = rcar_mipi_dsi_phtw_test(dsi, phtw2[i]);
+ if (ret < 0)
+ return ret;
+ }
+
+ /* Enable DOT clock */
+ vclkset = VCLKSET_CKEN;
+ rcar_mipi_dsi_set(dsi, VCLKSET, vclkset);
+
+ if (dsi_format == 24)
+ vclkset |= VCLKSET_BPP_24;
+ else if (dsi_format == 18)
+ vclkset |= VCLKSET_BPP_18;
+ else if (dsi_format == 16)
+ vclkset |= VCLKSET_BPP_16;
+ else {
+ dev_warn(dsi->dev, "unsupported format");
+ return -EINVAL;
+ }
+ vclkset |= VCLKSET_COLOR_RGB | VCLKSET_DIV(setup_info.div)
+ | VCLKSET_LANE(dsi->lanes - 1);
+
+ rcar_mipi_dsi_set(dsi, VCLKSET, vclkset);
+
+ /* After setting VCLKSET register, enable VCLKEN */
+ rcar_mipi_dsi_set(dsi, VCLKEN, VCLKEN_CKEN);
+
+ dev_dbg(dsi->dev, "DSI device is started\n");
+
+ return 0;
+}
+
+static void rcar_mipi_dsi_shutdown(struct rcar_mipi_dsi *dsi)
+{
+ rcar_mipi_dsi_clr(dsi, PHYSETUP, PHYSETUP_RSTZ);
+ rcar_mipi_dsi_clr(dsi, PHYSETUP, PHYSETUP_SHUTDOWNZ);
+
+ dev_dbg(dsi->dev, "DSI device is shutdown\n");
+}
+
+static int rcar_mipi_dsi_clk_enable(struct rcar_mipi_dsi *dsi)
+{
+ int ret;
+
+ reset_control_deassert(dsi->rstc);
+
+ ret = clk_prepare_enable(dsi->clocks.mod);
+ if (ret < 0)
+ goto err_reset;
+
+ ret = clk_prepare_enable(dsi->clocks.dsi);
+ if (ret < 0)
+ goto err_clock;
+
+ return 0;
+
+err_clock:
+ clk_disable_unprepare(dsi->clocks.mod);
+err_reset:
+ reset_control_assert(dsi->rstc);
+ return ret;
+}
+
+static void rcar_mipi_dsi_clk_disable(struct rcar_mipi_dsi *dsi)
+{
+ clk_disable_unprepare(dsi->clocks.dsi);
+ clk_disable_unprepare(dsi->clocks.mod);
+
+ reset_control_assert(dsi->rstc);
+}
+
+static int rcar_mipi_dsi_start_hs_clock(struct rcar_mipi_dsi *dsi)
+{
+ /*
+ * In HW manual, we need to check TxDDRClkHS-Q Stable? but it dont
+ * write how to check. So we skip this check in this patch
+ */
+ u32 status;
+ int ret;
+
+ /* Start HS clock. */
+ rcar_mipi_dsi_set(dsi, PPICLCR, PPICLCR_TXREQHS);
+
+ ret = read_poll_timeout(rcar_mipi_dsi_read, status,
+ status & PPICLSR_TOHS,
+ 2000, 10000, false, dsi, PPICLSR);
+ if (ret < 0) {
+ dev_err(dsi->dev, "failed to enable HS clock\n");
+ return ret;
+ }
+
+ rcar_mipi_dsi_set(dsi, PPICLSCR, PPICLSCR_TOHS);
+
+ return 0;
+}
+
+static int rcar_mipi_dsi_start_video(struct rcar_mipi_dsi *dsi)
+{
+ u32 status;
+ int ret;
+
+ /* Wait for the link to be ready. */
+ ret = read_poll_timeout(rcar_mipi_dsi_read, status,
+ !(status & (LINKSR_LPBUSY | LINKSR_HSBUSY)),
+ 2000, 10000, false, dsi, LINKSR);
+ if (ret < 0) {
+ dev_err(dsi->dev, "Link failed to become ready\n");
+ return ret;
+ }
+
+ /* De-assert video FIFO clear. */
+ rcar_mipi_dsi_clr(dsi, TXVMCR, TXVMCR_VFCLR);
+
+ ret = read_poll_timeout(rcar_mipi_dsi_read, status,
+ status & TXVMSR_VFRDY,
+ 2000, 10000, false, dsi, TXVMSR);
+ if (ret < 0) {
+ dev_err(dsi->dev, "Failed to de-assert video FIFO clear\n");
+ return ret;
+ }
+
+ /* Enable transmission in video mode. */
+ rcar_mipi_dsi_set(dsi, TXVMCR, TXVMCR_EN_VIDEO);
+
+ ret = read_poll_timeout(rcar_mipi_dsi_read, status,
+ status & TXVMSR_RDY,
+ 2000, 10000, false, dsi, TXVMSR);
+ if (ret < 0) {
+ dev_err(dsi->dev, "Failed to enable video transmission\n");
+ return ret;
+ }
+
+ return 0;
+}
+
+/* -----------------------------------------------------------------------------
+ * Bridge
+ */
+
+static int rcar_mipi_dsi_attach(struct drm_bridge *bridge,
+ enum drm_bridge_attach_flags flags)
+{
+ struct rcar_mipi_dsi *dsi = bridge_to_rcar_mipi_dsi(bridge);
+
+ return drm_bridge_attach(bridge->encoder, dsi->next_bridge, bridge,
+ flags);
+}
+
+static void rcar_mipi_dsi_mode_set(struct drm_bridge *bridge,
+ const struct drm_display_mode *mode,
+ const struct drm_display_mode *adjusted_mode)
+{
+ struct rcar_mipi_dsi *dsi = bridge_to_rcar_mipi_dsi(bridge);
+
+ dsi->display_mode = *adjusted_mode;
+}
+
+static void rcar_mipi_dsi_enable(struct drm_bridge *bridge)
+{
+ struct rcar_mipi_dsi *dsi = bridge_to_rcar_mipi_dsi(bridge);
+ int ret;
+
+ ret = rcar_mipi_dsi_clk_enable(dsi);
+ if (ret < 0) {
+ dev_err(dsi->dev, "failed to enable DSI clocks\n");
+ return;
+ }
+
+ ret = rcar_mipi_dsi_startup(dsi);
+ if (ret < 0)
+ goto err_dsi_startup;
+
+ rcar_mipi_dsi_set_display_timing(dsi);
+
+ ret = rcar_mipi_dsi_start_hs_clock(dsi);
+ if (ret < 0)
+ goto err_dsi_start_hs;
+
+ rcar_mipi_dsi_start_video(dsi);
+
+ return;
+
+err_dsi_start_hs:
+ rcar_mipi_dsi_shutdown(dsi);
+err_dsi_startup:
+ rcar_mipi_dsi_clk_disable(dsi);
+}
+
+static void rcar_mipi_dsi_disable(struct drm_bridge *bridge)
+{
+ struct rcar_mipi_dsi *dsi = bridge_to_rcar_mipi_dsi(bridge);
+
+ rcar_mipi_dsi_shutdown(dsi);
+ rcar_mipi_dsi_clk_disable(dsi);
+}
+
+static enum drm_mode_status
+rcar_mipi_dsi_bridge_mode_valid(struct drm_bridge *bridge,
+ const struct drm_display_info *info,
+ const struct drm_display_mode *mode)
+{
+ if (mode->clock > 297000)
+ return MODE_CLOCK_HIGH;
+
+ return MODE_OK;
+}
+
+static const struct drm_bridge_funcs rcar_mipi_dsi_bridge_ops = {
+ .attach = rcar_mipi_dsi_attach,
+ .mode_set = rcar_mipi_dsi_mode_set,
+ .enable = rcar_mipi_dsi_enable,
+ .disable = rcar_mipi_dsi_disable,
+ .mode_valid = rcar_mipi_dsi_bridge_mode_valid,
+};
+
+/* -----------------------------------------------------------------------------
+ * Clock Setting
+ */
+
+
+/* -----------------------------------------------------------------------------
+ * Host setting
+ */
+
+static int rcar_mipi_dsi_host_attach(struct mipi_dsi_host *host,
+ struct mipi_dsi_device *device)
+{
+ struct rcar_mipi_dsi *dsi = host_to_rcar_mipi_dsi(host);
+
+ if (device->lanes > dsi->num_data_lanes)
+ return -EINVAL;
+
+ dsi->lanes = device->lanes;
+ dsi->format = device->format;
+
+ return 0;
+}
+
+static int rcar_mipi_dsi_host_detach(struct mipi_dsi_host *host,
+ struct mipi_dsi_device *device)
+{
+ return 0;
+}
+
+static const struct mipi_dsi_host_ops rcar_mipi_dsi_host_ops = {
+ .attach = rcar_mipi_dsi_host_attach,
+ .detach = rcar_mipi_dsi_host_detach,
+};
+
+/* -----------------------------------------------------------------------------
+ * Probe & Remove
+ */
+
+static int rcar_mipi_dsi_parse_dt(struct rcar_mipi_dsi *dsi)
+{
+ struct device_node *ep;
+ u32 data_lanes[4];
+ int ret;
+
+ ep = of_graph_get_endpoint_by_regs(dsi->dev->of_node, 1, 0);
+ if (!ep) {
+ dev_dbg(dsi->dev, "unconnected port at 1\n");
+ return -ENODEV;
+ }
+
+ ret = of_property_read_variable_u32_array(ep, "data-lanes", data_lanes,
+ 1, 4);
+ of_node_put(ep);
+
+ if (ret < 0) {
+ dev_err(dsi->dev, "missing or invalid data-lanes property\n");
+ return -ENODEV;
+ }
+
+ dsi->num_data_lanes = ret;
+ return 0;
+}
+
+static struct clk *rcar_mipi_dsi_get_clock(struct rcar_mipi_dsi *dsi,
+ const char *name,
+ bool optional)
+{
+ struct clk *clk;
+
+ clk = devm_clk_get(dsi->dev, name);
+ if (!IS_ERR(clk))
+ return clk;
+
+ if (PTR_ERR(clk) == -ENOENT && optional)
+ return NULL;
+
+ dev_err_probe(dsi->dev, PTR_ERR(clk), "failed to get %s clock\n",
+ name ? name : "module");
+
+ return clk;
+}
+
+static int rcar_mipi_dsi_get_clocks(struct rcar_mipi_dsi *dsi)
+{
+ dsi->clocks.mod = rcar_mipi_dsi_get_clock(dsi, NULL, false);
+ if (IS_ERR(dsi->clocks.mod))
+ return PTR_ERR(dsi->clocks.mod);
+
+ dsi->clocks.pll = rcar_mipi_dsi_get_clock(dsi, "pll", true);
+ if (IS_ERR(dsi->clocks.pll))
+ return PTR_ERR(dsi->clocks.pll);
+
+ dsi->clocks.dsi = rcar_mipi_dsi_get_clock(dsi, "dsi", true);
+ if (IS_ERR(dsi->clocks.dsi))
+ return PTR_ERR(dsi->clocks.dsi);
+
+ if (!dsi->clocks.pll && !dsi->clocks.dsi) {
+ dev_err(dsi->dev, "no input clock (pll, dsi)\n");
+ return -EINVAL;
+ }
+
+ return 0;
+}
+
+static int rcar_mipi_dsi_probe(struct platform_device *pdev)
+{
+ struct rcar_mipi_dsi *dsi;
+ struct drm_panel *panel;
+ struct resource *mem;
+ int ret;
+
+ dsi = devm_kzalloc(&pdev->dev, sizeof(*dsi), GFP_KERNEL);
+ if (dsi == NULL)
+ return -ENOMEM;
+
+ platform_set_drvdata(pdev, dsi);
+
+ dsi->dev = &pdev->dev;
+ dsi->info = of_device_get_match_data(&pdev->dev);
+
+ ret = rcar_mipi_dsi_parse_dt(dsi);
+ if (ret < 0)
+ return ret;
+
+ /* Acquire resources. */
+ mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+ dsi->mmio = devm_ioremap_resource(dsi->dev, mem);
+ if (IS_ERR(dsi->mmio))
+ return PTR_ERR(dsi->mmio);
+
+ ret = rcar_mipi_dsi_get_clocks(dsi);
+ if (ret < 0)
+ return ret;
+
+ dsi->rstc = devm_reset_control_get(dsi->dev, NULL);
+ if (IS_ERR(dsi->rstc)) {
+ dev_err(dsi->dev, "failed to get cpg reset\n");
+ return PTR_ERR(dsi->rstc);
+ }
+
+ ret = drm_of_find_panel_or_bridge(dsi->dev->of_node, 1, 0, &panel,
+ &dsi->next_bridge);
+ if (ret) {
+ dev_err_probe(dsi->dev, ret, "could not find next bridge\n");
+ return ret;
+ }
+
+ if (!dsi->next_bridge) {
+ dsi->next_bridge = devm_drm_panel_bridge_add(dsi->dev, panel);
+ if (IS_ERR(dsi->next_bridge)) {
+ dev_err(dsi->dev, "failed to create panel bridge\n");
+ return PTR_ERR(dsi->next_bridge);
+ }
+ }
+
+ /* Initialize the DSI host. */
+ dsi->host.dev = dsi->dev;
+ dsi->host.ops = &rcar_mipi_dsi_host_ops;
+ ret = mipi_dsi_host_register(&dsi->host);
+ if (ret < 0)
+ return ret;
+
+ /* Initialize the DRM bridge. */
+ dsi->bridge.funcs = &rcar_mipi_dsi_bridge_ops;
+ dsi->bridge.of_node = dsi->dev->of_node;
+ drm_bridge_add(&dsi->bridge);
+
+ return 0;
+}
+
+static int rcar_mipi_dsi_remove(struct platform_device *pdev)
+{
+ struct rcar_mipi_dsi *dsi = platform_get_drvdata(pdev);
+
+ drm_bridge_remove(&dsi->bridge);
+
+ mipi_dsi_host_unregister(&dsi->host);
+
+ return 0;
+}
+
+static const struct of_device_id rcar_mipi_dsi_of_table[] = {
+ { .compatible = "renesas,r8a779a0-dsi-csi2-tx" },
+ { }
+};
+
+MODULE_DEVICE_TABLE(of, rcar_mipi_dsi_of_table);
+
+static struct platform_driver rcar_mipi_dsi_platform_driver = {
+ .probe = rcar_mipi_dsi_probe,
+ .remove = rcar_mipi_dsi_remove,
+ .driver = {
+ .name = "rcar-mipi-dsi",
+ .of_match_table = rcar_mipi_dsi_of_table,
+ },
+};
+
+module_platform_driver(rcar_mipi_dsi_platform_driver);
+
+MODULE_DESCRIPTION("Renesas R-Car MIPI DSI Encoder Driver");
+MODULE_LICENSE("GPL");
diff --git a/drivers/gpu/drm/rcar-du/rcar_mipi_dsi_regs.h b/drivers/gpu/drm/rcar-du/rcar_mipi_dsi_regs.h
new file mode 100644
index 000000000000..0e7a9274749f
--- /dev/null
+++ b/drivers/gpu/drm/rcar-du/rcar_mipi_dsi_regs.h
@@ -0,0 +1,172 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+/*
+ * rcar_mipi_dsi_regs.h -- R-Car MIPI DSI Interface Registers Definitions
+ *
+ * Copyright (C) 2020 Renesas Electronics Corporation
+ */
+
+#ifndef __RCAR_MIPI_DSI_REGS_H__
+#define __RCAR_MIPI_DSI_REGS_H__
+
+#define LINKSR 0x010
+#define LINKSR_LPBUSY (1 << 1)
+#define LINKSR_HSBUSY (1 << 0)
+
+/*
+ * Video Mode Register
+ */
+#define TXVMSETR 0x180
+#define TXVMSETR_SYNSEQ_PULSES (0 << 16)
+#define TXVMSETR_SYNSEQ_EVENTS (1 << 16)
+#define TXVMSETR_VSTPM (1 << 15)
+#define TXVMSETR_PIXWDTH (1 << 8)
+#define TXVMSETR_VSEN_EN (1 << 4)
+#define TXVMSETR_VSEN_DIS (0 << 4)
+#define TXVMSETR_HFPBPEN_EN (1 << 2)
+#define TXVMSETR_HFPBPEN_DIS (0 << 2)
+#define TXVMSETR_HBPBPEN_EN (1 << 1)
+#define TXVMSETR_HBPBPEN_DIS (0 << 1)
+#define TXVMSETR_HSABPEN_EN (1 << 0)
+#define TXVMSETR_HSABPEN_DIS (0 << 0)
+
+#define TXVMCR 0x190
+#define TXVMCR_VFCLR (1 << 12)
+#define TXVMCR_EN_VIDEO (1 << 0)
+
+#define TXVMSR 0x1a0
+#define TXVMSR_STR (1 << 16)
+#define TXVMSR_VFRDY (1 << 12)
+#define TXVMSR_ACT (1 << 8)
+#define TXVMSR_RDY (1 << 0)
+
+#define TXVMSCR 0x1a4
+#define TXVMSCR_STR (1 << 16)
+
+#define TXVMPSPHSETR 0x1c0
+#define TXVMPSPHSETR_DT_RGB16 (0x0e << 16)
+#define TXVMPSPHSETR_DT_RGB18 (0x1e << 16)
+#define TXVMPSPHSETR_DT_RGB18_LS (0x2e << 16)
+#define TXVMPSPHSETR_DT_RGB24 (0x3e << 16)
+#define TXVMPSPHSETR_DT_YCBCR16 (0x2c << 16)
+
+#define TXVMVPRMSET0R 0x1d0
+#define TXVMVPRMSET0R_HSPOL_HIG (0 << 17)
+#define TXVMVPRMSET0R_HSPOL_LOW (1 << 17)
+#define TXVMVPRMSET0R_VSPOL_HIG (0 << 16)
+#define TXVMVPRMSET0R_VSPOL_LOW (1 << 16)
+#define TXVMVPRMSET0R_CSPC_RGB (0 << 4)
+#define TXVMVPRMSET0R_CSPC_YCbCr (1 << 4)
+#define TXVMVPRMSET0R_BPP_16 (0 << 0)
+#define TXVMVPRMSET0R_BPP_18 (1 << 0)
+#define TXVMVPRMSET0R_BPP_24 (2 << 0)
+
+#define TXVMVPRMSET1R 0x1d4
+#define TXVMVPRMSET1R_VACTIVE(x) (((x) & 0x7fff) << 16)
+#define TXVMVPRMSET1R_VSA(x) (((x) & 0xfff) << 0)
+
+#define TXVMVPRMSET2R 0x1d8
+#define TXVMVPRMSET2R_VFP(x) (((x) & 0x1fff) << 16)
+#define TXVMVPRMSET2R_VBP(x) (((x) & 0x1fff) << 0)
+
+#define TXVMVPRMSET3R 0x1dc
+#define TXVMVPRMSET3R_HACTIVE(x) (((x) & 0x7fff) << 16)
+#define TXVMVPRMSET3R_HSA(x) (((x) & 0xfff) << 0)
+
+#define TXVMVPRMSET4R 0x1e0
+#define TXVMVPRMSET4R_HFP(x) (((x) & 0x1fff) << 16)
+#define TXVMVPRMSET4R_HBP(x) (((x) & 0x1fff) << 0)
+
+/*
+ * PHY-Protocol Interface (PPI) Registers
+ */
+#define PPISETR 0x700
+#define PPISETR_DLEN_0 (0x1 << 0)
+#define PPISETR_DLEN_1 (0x3 << 0)
+#define PPISETR_DLEN_2 (0x7 << 0)
+#define PPISETR_DLEN_3 (0xf << 0)
+#define PPISETR_CLEN (1 << 8)
+
+#define PPICLCR 0x710
+#define PPICLCR_TXREQHS (1 << 8)
+#define PPICLCR_TXULPSEXT (1 << 1)
+#define PPICLCR_TXULPSCLK (1 << 0)
+
+#define PPICLSR 0x720
+#define PPICLSR_HSTOLP (1 << 27)
+#define PPICLSR_TOHS (1 << 26)
+#define PPICLSR_STPST (1 << 0)
+
+#define PPICLSCR 0x724
+#define PPICLSCR_HSTOLP (1 << 27)
+#define PPICLSCR_TOHS (1 << 26)
+
+#define PPIDLSR 0x760
+#define PPIDLSR_STPST (0xf << 0)
+
+/*
+ * Clocks registers
+ */
+#define LPCLKSET 0x1000
+#define LPCLKSET_CKEN (1 << 8)
+#define LPCLKSET_LPCLKDIV(x) (((x) & 0x3f) << 0)
+
+#define CFGCLKSET 0x1004
+#define CFGCLKSET_CKEN (1 << 8)
+#define CFGCLKSET_CFGCLKDIV(x) (((x) & 0x3f) << 0)
+
+#define DOTCLKDIV 0x1008
+#define DOTCLKDIV_CKEN (1 << 8)
+#define DOTCLKDIV_DOTCLKDIV(x) (((x) & 0x3f) << 0)
+
+#define VCLKSET 0x100c
+#define VCLKSET_CKEN (1 << 16)
+#define VCLKSET_COLOR_RGB (0 << 8)
+#define VCLKSET_COLOR_YCC (1 << 8)
+#define VCLKSET_DIV(x) (((x) & 0x3) << 4)
+#define VCLKSET_BPP_16 (0 << 2)
+#define VCLKSET_BPP_18 (1 << 2)
+#define VCLKSET_BPP_18L (2 << 2)
+#define VCLKSET_BPP_24 (3 << 2)
+#define VCLKSET_LANE(x) (((x) & 0x3) << 0)
+
+#define VCLKEN 0x1010
+#define VCLKEN_CKEN (1 << 0)
+
+#define PHYSETUP 0x1014
+#define PHYSETUP_HSFREQRANGE(x) (((x) & 0x7f) << 16)
+#define PHYSETUP_HSFREQRANGE_MASK (0x7f << 16)
+#define PHYSETUP_CFGCLKFREQRANGE(x) (((x) & 0x3f) << 8)
+#define PHYSETUP_SHUTDOWNZ (1 << 1)
+#define PHYSETUP_RSTZ (1 << 0)
+
+#define CLOCKSET1 0x101c
+#define CLOCKSET1_LOCK_PHY (1 << 17)
+#define CLOCKSET1_LOCK (1 << 16)
+#define CLOCKSET1_CLKSEL (1 << 8)
+#define CLOCKSET1_CLKINSEL_EXTAL (0 << 2)
+#define CLOCKSET1_CLKINSEL_DIG (1 << 2)
+#define CLOCKSET1_CLKINSEL_DU (1 << 3)
+#define CLOCKSET1_SHADOW_CLEAR (1 << 1)
+#define CLOCKSET1_UPDATEPLL (1 << 0)
+
+#define CLOCKSET2 0x1020
+#define CLOCKSET2_M(x) (((x) & 0xfff) << 16)
+#define CLOCKSET2_VCO_CNTRL(x) (((x) & 0x3f) << 8)
+#define CLOCKSET2_N(x) (((x) & 0xf) << 0)
+
+#define CLOCKSET3 0x1024
+#define CLOCKSET3_PROP_CNTRL(x) (((x) & 0x3f) << 24)
+#define CLOCKSET3_INT_CNTRL(x) (((x) & 0x3f) << 16)
+#define CLOCKSET3_CPBIAS_CNTRL(x) (((x) & 0x7f) << 8)
+#define CLOCKSET3_GMP_CNTRL(x) (((x) & 0x3) << 0)
+
+#define PHTW 0x1034
+#define PHTW_DWEN (1 << 24)
+#define PHTW_TESTDIN_DATA(x) (((x) & 0xff) << 16)
+#define PHTW_CWEN (1 << 8)
+#define PHTW_TESTDIN_CODE(x) (((x) & 0xff) << 0)
+
+#define PHTC 0x103c
+#define PHTC_TESTCLR (1 << 0)
+
+#endif /* __RCAR_MIPI_DSI_REGS_H__ */
--
Regards,
Laurent Pinchart
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