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SubjectRe: [PATCH v6 4/8] drm: imx: Add i.MX 6 MIPI DSI host platform driver
Date
Hi Enric & Laurent,

On Wed, 15 Apr 2020, Laurent Pinchart
<laurent.pinchart@ideasonboard.com> wrote:
> Hi Enric,
>
> On Wed, Apr 15, 2020 at 07:26:02PM +0200, Enric Balletbo Serra
> wrote:
>> Missatge de Adrian Ratiu <adrian.ratiu@collabora.com> del dia
>> dt., 14 d’abr. 2020 a les 17:19:
>> >
>> > This adds support for the Synopsis DesignWare MIPI DSI v1.01
>> > host controller which is embedded in i.MX 6 SoCs.
>> >
>> > Based on following patches, but updated/extended to work with
>> > existing support found in the kernel:
>> >
>> > - drm: imx: Support Synopsys DesignWare MIPI DSI host
>> > controller
>> > Signed-off-by: Liu Ying <Ying.Liu@freescale.com>
>> >
>> > Cc: Fabio Estevam <festevam@gmail.com> Reviewed-by: Emil
>> > Velikov <emil.velikov@collabora.com> Tested-by: Adrian Pop
>> > <pop.adrian61@gmail.com> Tested-by: Arnaud Ferraris
>> > <arnaud.ferraris@collabora.com> Signed-off-by: Sjoerd Simons
>> > <sjoerd.simons@collabora.com> Signed-off-by: Martyn Welch
>> > <martyn.welch@collabora.com> Signed-off-by: Adrian Ratiu
>> > <adrian.ratiu@collabora.com> --- Changes since v5:
>> > - Reword to remove unrelated device tree patch mention
>> > (Fabio) - Move pllref_clk enable/disable to bind/unbind
>> > (Ezequiel) - Fix freescale.com -> nxp.com email addresses
>> > (Fabio) - Also added myself as module author (Fabio) - Use
>> > DRM_DEV_* macros for consistency, print more error msg
>> >
>> > Changes since v4:
>> > - Split off driver-specific configuration of phy timings
>> > due to new upstream API. - Move regmap infrastructure
>> > logic to separate commit (Ezequiel) - Move dsi v1.01 layout
>> > addition to a separate commit (Ezequiel) - Minor warnings
>> > and driver name fixes
>> >
>> > Changes since v3:
>> > - Renamed platform driver to reflect it's i.MX6
>> > only. (Fabio)
>> >
>> > Changes since v2:
>> > - Fixed commit tags. (Emil)
>> >
>> > Changes since v1:
>> > - Moved register definitions & regmap initialization into
>> > bridge module. Platform drivers get the regmap via
>> > plat_data after calling the bridge probe. (Emil)
>> > ---
>> > drivers/gpu/drm/imx/Kconfig | 7 +
>> > drivers/gpu/drm/imx/Makefile | 1 +
>> > drivers/gpu/drm/imx/dw_mipi_dsi-imx6.c | 409
>> > +++++++++++++++++++++++++ 3 files changed, 417 insertions(+)
>> > create mode 100644 drivers/gpu/drm/imx/dw_mipi_dsi-imx6.c
>> >
>> > diff --git a/drivers/gpu/drm/imx/Kconfig
>> > b/drivers/gpu/drm/imx/Kconfig index
>> > 207bf7409dfb..b49e70e7f0fd 100644 ---
>> > a/drivers/gpu/drm/imx/Kconfig +++
>> > b/drivers/gpu/drm/imx/Kconfig @@ -39,3 +39,10 @@ config
>> > DRM_IMX_HDMI
>> > depends on DRM_IMX help
>> > Choose this if you want to use HDMI on i.MX6.
>> > + +config DRM_IMX6_MIPI_DSI + tristate "Freescale i.MX6
>> > DRM MIPI DSI" + select DRM_DW_MIPI_DSI + depends
>> > on DRM_IMX
>> Should it depend on CONFIG_OF too? I suspect you'll get build
>> errors if OF is not selected
>> > + help + Choose this if you want to use MIPI
>> > DSI on i.MX6. diff --git a/drivers/gpu/drm/imx/Makefile
>> > b/drivers/gpu/drm/imx/Makefile index
>> > 21cdcc2faabc..9a7843c59347 100644 ---
>> > a/drivers/gpu/drm/imx/Makefile +++
>> > b/drivers/gpu/drm/imx/Makefile @@ -9,3 +9,4 @@
>> > obj-$(CONFIG_DRM_IMX_TVE) += imx-tve.o
>> > obj-$(CONFIG_DRM_IMX_LDB) += imx-ldb.o
>> >
>> > obj-$(CONFIG_DRM_IMX_HDMI) += dw_hdmi-imx.o
>> > +obj-$(CONFIG_DRM_IMX6_MIPI_DSI) += dw_mipi_dsi-imx6.o diff
>> > --git a/drivers/gpu/drm/imx/dw_mipi_dsi-imx6.c
>> > b/drivers/gpu/drm/imx/dw_mipi_dsi-imx6.c new file mode 100644
>> > index 000000000000..6914db8ce8cb --- /dev/null +++
>> > b/drivers/gpu/drm/imx/dw_mipi_dsi-imx6.c @@ -0,0 +1,409 @@
>> > +// SPDX-License-Identifier: GPL-2.0+ +/* + * i.MX6 drm
>> > driver - MIPI DSI Host Controller + * + * Copyright (C)
>> > 2011-2015 Freescale Semiconductor, Inc. + * Copyright (C)
>> > 2019-2020 Collabora, Ltd. + */ + +#include <linux/clk.h>
>> > +#include <linux/component.h> +#include <linux/mfd/syscon.h>
>> > +#include <linux/mfd/syscon/imx6q-iomuxc-gpr.h> +#include
>> > <linux/module.h> +#include <linux/of_device.h> +#include
>> > <linux/regmap.h> +#include <linux/videodev2.h> +#include
>> > <drm/bridge/dw_mipi_dsi.h> +#include <drm/drm_crtc_helper.h>
>> > +#include <drm/drm_mipi_dsi.h> +#include <drm/drm_of.h>
>> > +#include <drm/drm_print.h> + +#include "imx-drm.h" +
>> > +#define DSI_PWR_UP 0x04 +#define RESET
>> > 0 +#define POWERUP BIT(0) +
>> > +#define DSI_PHY_IF_CTRL 0x5c +#define
>> > PHY_IF_CTRL_RESET 0x0 + +#define
>> > DSI_PHY_TST_CTRL0 0x64 +#define PHY_TESTCLK
>> > BIT(1) +#define PHY_UNTESTCLK 0 +#define
>> > PHY_TESTCLR BIT(0) +#define PHY_UNTESTCLR
>> > 0 + +#define DSI_PHY_TST_CTRL1 0x68 +#define
>> > PHY_TESTEN BIT(16) +#define PHY_UNTESTEN
>> > 0 +#define PHY_TESTDOUT(n) (((n) &
>> > 0xff) << 8) +#define PHY_TESTDIN(n) (((n) &
>> > 0xff) << 0) + +struct imx_mipi_dsi { + struct
>> > drm_encoder encoder; + struct device *dev; +
>> > struct regmap *mux_sel; + struct dw_mipi_dsi *mipi_dsi;
>> > + struct clk *pllref_clk; + + void __iomem *base;
>> > + unsigned int lane_mbps; +}; + +struct
>> > dphy_pll_testdin_map { + unsigned int max_mbps; +
>> > u8 testdin; +}; + +/* The table is based on 27MHz DPHY pll
>> > reference clock. */ +static const struct dphy_pll_testdin_map
>> > dptdin_map[] = { + {160, 0x04}, {180, 0x24}, {200,
>> > 0x44}, {210, 0x06}, + {240, 0x26}, {250, 0x46}, {270,
>> > 0x08}, {300, 0x28}, + {330, 0x48}, {360, 0x2a}, {400,
>> > 0x4a}, {450, 0x0c}, + {500, 0x2c}, {550, 0x0e}, {600,
>> > 0x2e}, {650, 0x10}, + {700, 0x30}, {750, 0x12}, {800,
>> > 0x32}, {850, 0x14}, + {900, 0x34}, {950, 0x54}, {1000,
>> > 0x74} +}; + +static inline struct imx_mipi_dsi
>> > *enc_to_dsi(struct drm_encoder *enc) +{ + return
>> > container_of(enc, struct imx_mipi_dsi, encoder); +} + +static
>> > void imx_mipi_dsi_set_ipu_di_mux(struct imx_mipi_dsi *dsi,
>> > int ipu_di) +{ + regmap_update_bits(dsi->mux_sel,
>> > IOMUXC_GPR3, +
>> > IMX6Q_GPR3_MIPI_MUX_CTL_MASK, +
>> > ipu_di << IMX6Q_GPR3_MIPI_MUX_CTL_SHIFT); +} + +static const
>> > struct drm_encoder_funcs imx_mipi_dsi_encoder_funcs = { +
>> > .destroy = imx_drm_encoder_destroy, +}; + +static bool
>> > imx_mipi_dsi_encoder_mode_fixup(struct drm_encoder *encoder,
>> > + const struct
>> > drm_display_mode *mode, +
>> > struct drm_display_mode *adj_mode) +{ + return true; +}
>> > + +static int imx_mipi_dsi_encoder_atomic_check(struct
>> > drm_encoder *encoder, +
>> > struct drm_crtc_state *crtc_state, +
>> > struct drm_connector_state *conn) +{ + struct
>> > imx_crtc_state *imx_crtc_state =
>> > to_imx_crtc_state(crtc_state); + + /* The following
>> > values are taken from dw_hdmi_imx_atomic_check */ +
>> > imx_crtc_state->bus_format = MEDIA_BUS_FMT_RGB888_1X24; +
>> > imx_crtc_state->di_hsync_pin = 2; +
>> > imx_crtc_state->di_vsync_pin = 3; + + return 0; +} +
>> > +static void imx_mipi_dsi_encoder_commit(struct drm_encoder
>> > *encoder) +{ + struct imx_mipi_dsi *dsi =
>> > enc_to_dsi(encoder); + int mux =
>> > drm_of_encoder_active_port_id(dsi->dev->of_node, encoder); +
>> > + imx_mipi_dsi_set_ipu_di_mux(dsi, mux); +} + +static
>> > void imx_mipi_dsi_encoder_disable(struct drm_encoder
>> > *encoder) +{ +} + +static const struct
>> > drm_encoder_helper_funcs imx_mipi_dsi_encoder_helpers = {
>> AFAIK (or at least this is the feedback I received)
>> drm_encoder is kind of deprecated, and nowadays all is migrated
>> to drm_bridge (encoders, bridges and panels). Of course, a
>> drm_encoder is needed, as the DRM core expects one, but should
>> just be a dummy object that you can probably create with just
>> calling drm_simple_encoder_init(). DRM maintainers, please
>> shout if I am wrong.
>
> That certainly matches my position :-) I would also add that the
> DRM encoder should be created in imx-drm-core.c or in
> ipuv3-crtc.c, not here.
>

Yes, I will do this change in v7 especially also because a new
commit 62fbddda2f72 ("drm/imx: Use simple encoder") landed in
-next recently which broke the current imx6 implementation by
removing the imx_drm_encoder_destroy() from imx-drm-core.c.

>> > + .mode_fixup = imx_mipi_dsi_encoder_mode_fixup,
>> > + .commit = imx_mipi_dsi_encoder_commit,
>> > + .disable = imx_mipi_dsi_encoder_disable,
>> > + .atomic_check = imx_mipi_dsi_encoder_atomic_check,
>> > +};
>> > +
>> > +static int imx_mipi_dsi_register(struct drm_device *drm,
>> > + struct imx_mipi_dsi *dsi)
>> > +{
>> > + int ret;
>> > +
>> > + ret = imx_drm_encoder_parse_of(drm, &dsi->encoder, dsi->dev->of_node);
>> > + if (ret)
>> > + return ret;
>> > +
>> > + drm_encoder_helper_add(&dsi->encoder,
>> > + &imx_mipi_dsi_encoder_helpers);
>> > + drm_encoder_init(drm, &dsi->encoder, &imx_mipi_dsi_encoder_funcs,
>> > + DRM_MODE_ENCODER_DSI, NULL);
>> > + return 0;
>> > +}
>> > +
>> > +static enum drm_mode_status imx_mipi_dsi_mode_valid(void *priv_data,
>> > + const struct drm_display_mode *mode)
>> > +{
>> > + /*
>> > + * The VID_PKT_SIZE field in the DSI_VID_PKT_CFG
>> > + * register is 11-bit.
>> > + */
>> > + if (mode->hdisplay > 0x7ff)
>> > + return MODE_BAD_HVALUE;
>> > +
>> > + /*
>> > + * The V_ACTIVE_LINES field in the DSI_VTIMING_CFG
>> > + * register is 11-bit.
>> > + */
>> > + if (mode->vdisplay > 0x7ff)
>> > + return MODE_BAD_VVALUE;
>> > +
>> > + return MODE_OK;
>> > +}
>> > +
>> > +
>> > +static unsigned int max_mbps_to_testdin(unsigned int max_mbps)
>> > +{
>> > + unsigned int i;
>> > +
>> > + for (i = 0; i < ARRAY_SIZE(dptdin_map); i++)
>> > + if (dptdin_map[i].max_mbps == max_mbps)
>> > + return dptdin_map[i].testdin;
>> > +
>> > + return -EINVAL;
>> > +}
>> > +
>> > +static inline void dsi_write(struct imx_mipi_dsi *dsi, u32 reg, u32 val)
>> > +{
>> > + writel(val, dsi->base + reg);
>> > +}
>> > +
>> > +static int imx_mipi_dsi_phy_init(void *priv_data)
>> > +{
>> > + struct imx_mipi_dsi *dsi = priv_data;
>> > + int testdin;
>> > +
>> > + testdin = max_mbps_to_testdin(dsi->lane_mbps);
>> > + if (testdin < 0) {
>> > + DRM_DEV_ERROR(dsi->dev,
>> > + "failed to get testdin for %dmbps lane clock\n",
>> > + dsi->lane_mbps);
>> > + return testdin;
>> > + }
>> > +
>> > + dsi_write(dsi, DSI_PHY_IF_CTRL, PHY_IF_CTRL_RESET);
>> > + dsi_write(dsi, DSI_PWR_UP, POWERUP);
>> > +
>> > + dsi_write(dsi, DSI_PHY_TST_CTRL0, PHY_UNTESTCLK | PHY_UNTESTCLR);
>> > + dsi_write(dsi, DSI_PHY_TST_CTRL1, PHY_TESTEN | PHY_TESTDOUT(0) |
>> > + PHY_TESTDIN(0x44));
>> > + dsi_write(dsi, DSI_PHY_TST_CTRL0, PHY_TESTCLK | PHY_UNTESTCLR);
>> > + dsi_write(dsi, DSI_PHY_TST_CTRL0, PHY_UNTESTCLK | PHY_UNTESTCLR);
>> > + dsi_write(dsi, DSI_PHY_TST_CTRL1, PHY_UNTESTEN | PHY_TESTDOUT(0) |
>> > + PHY_TESTDIN(testdin));
>> > + dsi_write(dsi, DSI_PHY_TST_CTRL0, PHY_TESTCLK | PHY_UNTESTCLR);
>> > + dsi_write(dsi, DSI_PHY_TST_CTRL0, PHY_UNTESTCLK | PHY_UNTESTCLR);
>> > +
>> > + return 0;
>> > +}
>> > +
>> > +static int imx_mipi_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 imx_mipi_dsi *dsi = priv_data;
>> > + int bpp;
>> > + unsigned int i, target_mbps, mpclk;
>> > + unsigned long pllref;
>> > +
>> > + bpp = mipi_dsi_pixel_format_to_bpp(format);
>> > + if (bpp < 0) {
>> > + DRM_DEV_ERROR(dsi->dev, "failed to get bpp for format %d: %d\n",
>> > + format, bpp);
>> > + return bpp;
>> > + }
>> > +
>> > + pllref = clk_get_rate(dsi->pllref_clk);
>> > + if (pllref != 27000000)
>> > + DRM_WARN("DSI pllref_clk not set to 27Mhz\n");
>> > +
>> > + mpclk = DIV_ROUND_UP(mode->clock, MSEC_PER_SEC);
>> > + if (mpclk) {
>> > + /* take 1/0.7 blanking overhead into consideration */
>> > + target_mbps = (mpclk * (bpp / lanes) * 10) / 7;
>> > + } else {
>> > + DRM_DEV_ERROR(dsi->dev, "use default 1Gbps DPHY pll clock\n");
>> > + target_mbps = 1000;
>> > + }
>> > +
>> > + DRM_DEV_DEBUG(dsi->dev, "target pllref_clk frequency is %uMbps\n",
>> > + target_mbps);
>> > +
>> > + for (i = 0; i < ARRAY_SIZE(dptdin_map); i++) {
>> > + if (target_mbps < dptdin_map[i].max_mbps) {
>> > + *lane_mbps = dptdin_map[i].max_mbps;
>> > + dsi->lane_mbps = *lane_mbps;
>> > + DRM_DEV_DEBUG(dsi->dev,
>> > + "real pllref_clk frequency is %uMbps\n",
>> > + *lane_mbps);
>> > + return 0;
>> > + }
>> > + }
>> > +
>> > + DRM_DEV_ERROR(dsi->dev, "DPHY clock frequency %uMbps is out of range\n",
>> > + target_mbps);
>> > +
>> > + return -EINVAL;
>> > +}
>> > +
>> > +static int
>> > +dw_mipi_dsi_phy_get_timing(void *priv_data, unsigned int lane_mbps,
>> > + struct dw_mipi_dsi_dphy_timing *timing)
>> > +{
>> > + timing->clk_hs2lp = 0x40;
>> > + timing->clk_lp2hs = 0x40;
>> > + timing->data_hs2lp = 0x40;
>> > + timing->data_lp2hs = 0x40;
>> > +
>> > + return 0;
>> > +}
>> > +
>> > +static const struct dw_mipi_dsi_phy_ops dw_mipi_dsi_imx6_phy_ops = {
>> > + .init = imx_mipi_dsi_phy_init,
>> > + .get_lane_mbps = imx_mipi_dsi_get_lane_mbps,
>> > + .get_timing = dw_mipi_dsi_phy_get_timing,
>> > +};
>> > +
>> > +static struct dw_mipi_dsi_plat_data imx6q_mipi_dsi_drv_data = {
>> > + .max_data_lanes = 2,
>> > + .mode_valid = imx_mipi_dsi_mode_valid,
>> > + .phy_ops = &dw_mipi_dsi_imx6_phy_ops,
>> > +};
>> > +
>> > +static const struct of_device_id imx_dsi_dt_ids[] = {
>> > + {
>> > + .compatible = "fsl,imx6q-mipi-dsi",
>> > + .data = &imx6q_mipi_dsi_drv_data,
>> > + },
>> > + { /* sentinel */ }
>> > +};
>> > +MODULE_DEVICE_TABLE(of, imx_dsi_dt_ids);
>> > +
>> > +static int imx_mipi_dsi_bind(struct device *dev, struct device *master,
>> > + void *data)
>> > +{
>> > + struct imx_mipi_dsi *dsi = dev_get_drvdata(dev);
>> > + struct drm_device *drm = data;
>> > + int ret;
>> > +
>> > + ret = clk_prepare_enable(dsi->pllref_clk);
>> > + if (ret) {
>> > + DRM_DEV_ERROR(dev, "Failed to enable pllref_clk: %d\n", ret);
>> > + return ret;
>> > + }
>> > +
>> > + ret = imx_mipi_dsi_register(drm, dsi);
>> > + if (ret) {
>> > + DRM_DEV_ERROR(dev, "Failed to register: %d\n", ret);
>> > + return ret;
>> > + }
>> > +
>> > + ret = dw_mipi_dsi_bind(dsi->mipi_dsi, &dsi->encoder);
>> > + if (ret) {
>> > + DRM_DEV_ERROR(dev, "Failed to bind: %d\n", ret);
>> > + return ret;
>> > + }
>> > +
>> > + return 0;
>> > +}
>> > +
>> > +static void imx_mipi_dsi_unbind(struct device *dev, struct device *master,
>> > + void *data)
>> > +{
>> > + struct imx_mipi_dsi *dsi = dev_get_drvdata(dev);
>> > +
>> > + dw_mipi_dsi_unbind(dsi->mipi_dsi);
>> > +
>> > + clk_disable_unprepare(dsi->pllref_clk);
>> > +}
>> > +
>> > +static const struct component_ops imx_mipi_dsi_ops = {
>> > + .bind = imx_mipi_dsi_bind,
>> > + .unbind = imx_mipi_dsi_unbind,
>> > +};
>> > +
>> > +static int imx_mipi_dsi_probe(struct platform_device *pdev)
>> > +{
>> > + struct device *dev = &pdev->dev;
>> > + const struct of_device_id *of_id = of_match_device(imx_dsi_dt_ids, dev);
>> > + struct dw_mipi_dsi_plat_data *pdata = (struct dw_mipi_dsi_plat_data *) of_id->data;
>> > + struct imx_mipi_dsi *dsi;
>> > + struct resource *res;
>> > + int ret;
>> > +
>> > + dsi = devm_kzalloc(dev, sizeof(*dsi), GFP_KERNEL);
>> > + if (!dsi)
>> > + return -ENOMEM;
>> > +
>> > + dsi->dev = dev;
>> > +
>> > + res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
>> > + dsi->base = devm_ioremap_resource(dev, res);
>> > + if (IS_ERR(dsi->base)) {
>> > + ret = PTR_ERR(dsi->base);
>> > + DRM_DEV_ERROR(dev, "Unable to get dsi registers: %d\n", ret);
>> > + return ret;
>> > + }
>> > +
>> > + dsi->pllref_clk = devm_clk_get(dev, "ref");
>> > + if (IS_ERR(dsi->pllref_clk)) {
>> > + ret = PTR_ERR(dsi->pllref_clk);
>> > + DRM_DEV_ERROR(dev, "Unable to get pllref_clk: %d\n", ret);
>> > + return ret;
>> > + }
>> > +
>> > + dsi->mux_sel = syscon_regmap_lookup_by_phandle(dev->of_node, "fsl,gpr");
>> > + if (IS_ERR(dsi->mux_sel)) {
>> > + ret = PTR_ERR(dsi->mux_sel);
>> > + DRM_DEV_ERROR(dev, "Failed to get GPR regmap: %d\n", ret);
>> > + return ret;
>> > + }
>> > +
>> > + dev_set_drvdata(dev, dsi);
>> > +
>> > + imx6q_mipi_dsi_drv_data.base = dsi->base;
>> > + imx6q_mipi_dsi_drv_data.priv_data = dsi;
>> > +
>> > + dsi->mipi_dsi = dw_mipi_dsi_probe(pdev, pdata);
>> > + if (IS_ERR(dsi->mipi_dsi)) {
>> > + ret = PTR_ERR(dsi->mipi_dsi);
>> > + DRM_DEV_ERROR(dev, "Failed to probe DW DSI host: %d\n", ret);
>> > + goto err_clkdisable;
>> > + }
>> > +
>> > + return component_add(&pdev->dev, &imx_mipi_dsi_ops);
>> > +
>> > +err_clkdisable:
>> > + clk_disable_unprepare(dsi->pllref_clk);
>> > + return ret;
>> > +}
>> > +
>> > +static int imx_mipi_dsi_remove(struct platform_device *pdev)
>> > +{
>> > + component_del(&pdev->dev, &imx_mipi_dsi_ops);
>> > + return 0;
>> > +}
>> > +
>> > +static struct platform_driver imx_mipi_dsi_driver = {
>> > + .probe = imx_mipi_dsi_probe,
>> > + .remove = imx_mipi_dsi_remove,
>> > + .driver = {
>> > + .of_match_table = imx_dsi_dt_ids,
>> > + .name = "dw-mipi-dsi-imx6",
>> > + },
>> > +};
>> > +module_platform_driver(imx_mipi_dsi_driver);
>> > +
>> > +MODULE_DESCRIPTION("i.MX6 MIPI DSI host controller driver");
>> > +MODULE_AUTHOR("Liu Ying <victor.liu@nxp.com>");
>> > +MODULE_AUTHOR("Adrian Ratiu <adrian.ratiu@collabora.com>");
>> > +MODULE_LICENSE("GPL");
>
> --
> Regards,
>
> Laurent Pinchart

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