[PATCH v3 2/2] drm: rcar-du: Add R-Car DSI driver
Laurent Pinchart
laurent.pinchart at ideasonboard.com
Wed Dec 1 11:35:30 UTC 2021
Hi Jagan,
On Wed, Dec 01, 2021 at 04:12:39PM +0530, Jagan Teki wrote:
> On Wed, Dec 1, 2021 at 10:54 AM Laurent Pinchart wrote:
> >
> > 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>
> > Acked-by: Sam Ravnborg <sam at ravnborg.org>
> > ---
> > Changes since v2:
> >
> > - Support probing of child DSI devices
> > - Use devm_drm_of_get_bridge() helper
> >
> > Changes since v1:
> >
> > - Use U suffix for unsigned constants
> > - Fix indentation in Makefile
> > - Select DRM_MIPI_DSI
> > - Report correct fout frequency in debug message
> > - Move dsi_setup_info.err to local variable
> > ---
> > drivers/gpu/drm/rcar-du/Kconfig | 7 +
> > drivers/gpu/drm/rcar-du/Makefile | 1 +
> > drivers/gpu/drm/rcar-du/rcar_mipi_dsi.c | 817 +++++++++++++++++++
> > drivers/gpu/drm/rcar-du/rcar_mipi_dsi_regs.h | 172 ++++
> > 4 files changed, 997 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 3e588ddba245..1675df21d91f 100644
> > --- a/drivers/gpu/drm/rcar-du/Kconfig
> > +++ b/drivers/gpu/drm/rcar-du/Kconfig
> > @@ -45,6 +45,13 @@ config DRM_RCAR_LVDS
> > select OF_FLATTREE
> > select OF_OVERLAY
> >
> > +config DRM_RCAR_MIPI_DSI
> > + tristate "R-Car DU MIPI DSI Encoder Support"
> > + depends on DRM && DRM_BRIDGE && OF
> > + select DRM_MIPI_DSI
> > + 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..286bc81b3e7c 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..fcaec3308d68
> > --- /dev/null
> > +++ b/drivers/gpu/drm/rcar-du/rcar_mipi_dsi.c
> > @@ -0,0 +1,817 @@
> > +// 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] = {
> > + { 80000000U, 0x00 }, { 90000000U, 0x10 }, { 100000000U, 0x20 },
> > + { 110000000U, 0x30 }, { 120000000U, 0x01 }, { 130000000U, 0x11 },
> > + { 140000000U, 0x21 }, { 150000000U, 0x31 }, { 160000000U, 0x02 },
> > + { 170000000U, 0x12 }, { 180000000U, 0x22 }, { 190000000U, 0x32 },
> > + { 205000000U, 0x03 }, { 220000000U, 0x13 }, { 235000000U, 0x23 },
> > + { 250000000U, 0x33 }, { 275000000U, 0x04 }, { 300000000U, 0x14 },
> > + { 325000000U, 0x25 }, { 350000000U, 0x35 }, { 400000000U, 0x05 },
> > + { 450000000U, 0x16 }, { 500000000U, 0x26 }, { 550000000U, 0x37 },
> > + { 600000000U, 0x07 }, { 650000000U, 0x18 }, { 700000000U, 0x28 },
> > + { 750000000U, 0x39 }, { 800000000U, 0x09 }, { 850000000U, 0x19 },
> > + { 900000000U, 0x29 }, { 950000000U, 0x3a }, { 1000000000U, 0x0a },
> > + { 1050000000U, 0x1a }, { 1100000000U, 0x2a }, { 1150000000U, 0x3b },
> > + { 1200000000U, 0x0b }, { 1250000000U, 0x1b }, { 1300000000U, 0x2b },
> > + { 1350000000U, 0x3c }, { 1400000000U, 0x0c }, { 1450000000U, 0x1c },
> > + { 1500000000U, 0x2c }, { 1550000000U, 0x3d }, { 1600000000U, 0x0d },
> > + { 1650000000U, 0x1d }, { 1700000000U, 0x2e }, { 1750000000U, 0x3e },
> > + { 1800000000U, 0x0e }, { 1850000000U, 0x1e }, { 1900000000U, 0x2f },
> > + { 1950000000U, 0x3f }, { 2000000000U, 0x0f }, { 2050000000U, 0x40 },
> > + { 2100000000U, 0x41 }, { 2150000000U, 0x42 }, { 2200000000U, 0x43 },
> > + { 2250000000U, 0x44 }, { 2300000000U, 0x45 }, { 2350000000U, 0x46 },
> > + { 2400000000U, 0x47 }, { 2450000000U, 0x48 }, { 2500000000U, 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 = 40000000U, .max_freq = 55000000U, .value = 0x3f },
> > + { .min_freq = 52500000U, .max_freq = 80000000U, .value = 0x39 },
> > + { .min_freq = 80000000U, .max_freq = 110000000U, .value = 0x2f },
> > + { .min_freq = 105000000U, .max_freq = 160000000U, .value = 0x29 },
> > + { .min_freq = 160000000U, .max_freq = 220000000U, .value = 0x1f },
> > + { .min_freq = 210000000U, .max_freq = 320000000U, .value = 0x19 },
> > + { .min_freq = 320000000U, .max_freq = 440000000U, .value = 0x0f },
> > + { .min_freq = 420000000U, .max_freq = 660000000U, .value = 0x09 },
> > + { .min_freq = 630000000U, .max_freq = 1149000000U, .value = 0x03 },
> > + { .min_freq = 1100000000U, .max_freq = 1152000000U, .value = 0x01 },
> > + { .min_freq = 1150000000U, .max_freq = 1250000000U, .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 long fout;
> > + 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 best_err = -1;
> > + 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 < best_err) {
> > + setup_info->m = m - 2;
> > + setup_info->n = n - 1;
> > + setup_info->fout = fout;
> > + best_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, setup_info->fout, fout_target, best_err / 100,
> > + best_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 = {};
> > + 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,
>
> Can the new bridge drivers start using atomic function calls?
You're right. I'll fix that.
--
Regards,
Laurent Pinchart
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