W dniu 23.06.2021 o 15:56, Laurent Pinchart pisze:
> From: LUU HOAI <hoai.luu.ub@xxxxxxxxxxx>
>
> 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@xxxxxxxxxxx>
> Signed-off-by: Laurent Pinchart <laurent.pinchart+renesas@xxxxxxxxxxxxxxxx>
> Reviewed-by: Kieran Bingham <kieran.bingham+renesas@xxxxxxxxxxxxxxxx>
> Tested-by: Kieran Bingham <kieran.bingham+renesas@xxxxxxxxxxxxxxxx>
> ---
> 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@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);
You are looking for sink but DSI host is not yet registered, thus DSI
child devices not yet created/bound, so in case of DSI-controlled sinks
it will be always error.
Please look at pending documentation patch[1] for more in-depth explanation.
[1]: https://lkml.org/lkml/2021/9/10/165
Regards
Andrzej
> + 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__ */
