Re: [PATCH v7 4/8] drm: imx: Add i.MX 6 MIPI DSI host platform driver

From: Daniel Vetter
Date: Thu Apr 30 2020 - 09:58:52 EST

On Tue, Apr 28, 2020 at 10:08:04PM +0300, Adrian Ratiu wrote:
> Hi Daniel,
>
> On Tue, 28 Apr 2020, Daniel Vetter <daniel@xxxxxxxx> wrote:
> > On Wed, Apr 22, 2020 at 04:07:27AM +0300, Laurent Pinchart wrote:
> > > Hi Adrian, On Tue, Apr 21, 2020 at 07:16:06PM +0300, Adrian Ratiu
> > > wrote: > 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@xxxxxxxxxxxxx> > Cc: Fabio Estevam <festevam@xxxxxxxxx>
> > > Cc: Enric Balletbo > Serra <eballetbo@xxxxxxxxx> Reviewed-by: Emil
> > > Velikov > <emil.velikov@xxxxxxxxxxxxx> Tested-by: Adrian Pop >
> > > <pop.adrian61@xxxxxxxxx> Tested-by: Arnaud Ferraris >
> > > <arnaud.ferraris@xxxxxxxxxxxxx> Signed-off-by: Sjoerd Simons >
> > > <sjoerd.simons@xxxxxxxxxxxxx> Signed-off-by: Martyn Welch >
> > > <martyn.welch@xxxxxxxxxxxxx> Signed-off-by: Adrian Ratiu >
> > > <adrian.ratiu@xxxxxxxxxxxxx> --- Changes since v6: > - Replaced
> > > custom noop encoder with the simple drm encoder > (Enric) - Added
> > > CONFIG_DRM_IMX6_MIPI_DSI depends on > CONFIG_OF (Enric) - Dropped
> > > imx_mipi_dsi_register() because > now it only creates the dummy
> > > encoder which can easily be > done directly in imx_dsi_bind() >
> > > 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 | 8
> > > + > drivers/gpu/drm/imx/Makefile | 1 + >
> > > drivers/gpu/drm/imx/dw_mipi_dsi-imx6.c | 391 >
> > > +++++++++++++++++++++++++ 3 files changed, 400 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 > 207bf7409dfba..0dffc72df7922 100644 --- >
> > > a/drivers/gpu/drm/imx/Kconfig +++ > b/drivers/gpu/drm/imx/Kconfig @@
> > > -39,3 +39,11 @@ 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 + depends on OF
> > > + 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 21cdcc2faabc8..9a7843c593478
> > > 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 0000000000000..f8a0a4fe16e21 --- /dev/null +++ >
> > > b/drivers/gpu/drm/imx/dw_mipi_dsi-imx6.c @@ -0,0 +1,391 @@ > +//
> > > 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 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; +} No encoder functions please. This should be a
> > > bridge driver, the encoder should be created by the i.MX display
> > > controller driver itself. As that would require quite a bit of
> > > refactoring I'm OK having an encoder here for the meantime, but it
> > > should be a dummy one, without any operation.
> >
> > +1 on this, came to say the same. This seems to duplicate the dw-hdmi
> > design, where the code organization is a bit a mess, with some parts in
> > drm/bridge, and some parts in each drm_device driver. Plus drm_encoder
> > in there on top.
> >
> > If we want to continue with the drm_bridge abstraction for these kind of
> > drivers then imo we need:
> >
> > - to make drm_bridge the actual abstraction, no leaking back&forth
> > between the bridge chip and the overall drm_device side of things.
> >
> > - move _all_ dw-mipi-dsi related code into drm/bridge
> >
> > - for the platform specific binding stuff I think drm/bridge/dw-mipi-dsi
> > directory, which contains the main driver, plus a file each for the
> > imx/stm/whatever platform bindings sounds like a reasonable layout.
> >
> > If that doesn't work, then I think dw-mipi-dsi isn't really a bridge
> > driver with clear encapsulation, but instead should be structured as a
> > helper library to implement a drm_encoder. And no drm_bridge.
> >
> > And yes the exact same problem exists with dw-hdmi. That's the reason
> > why I've started to look into these, it's not really a code pattern we
> > should repeat imo.
>
> The code structure you propose should be doable and I was actually thinking
> of something like it when writing the cover letter for v8 of this series,
> about how to consolidate the Synopsis DW MIPI DSI logic at the same time
> while consolidating the rest of imx drivers to unify their simple encoder
> management.
>
> Thank you for fleshing it out! It's very helpful :)
>
> BTW have you seen what I did with the bridge in v8 for the imx6 driver? [1]
>
> What I'd like to avoid is feature creep in this patch series which is about
> adding the imx6 driver, because I think moving the logic and refactoring all
> the drivers is a separate issue and already this series is big and
> increasing.
>
> So would you be ok with merging the imx6 mipi dsi driver with its
> dw-mipi-dsi regamp rework and doing the refactoring to consolidate all the
> bridge logic in a separate patch series which also includes moving the
> rockchip and stm encoder logic to a drm_bridge?
>
> Or would you like me to do this consolidation rework in advance just for the
> new imx6 mipi-dsi driver in this series and tackle the rest of drivers in a
> separate patch series?

Yeah I think that rework is going to be a lot of work. Generally as long
as we have agreement about the long-term direction, then I think in-tree
refactoring leads to best results. So if other bridge people (I've just
jumped in here) agree, then we're good to go.

I think best way to document the agreement is to type up a patch for
Documentation/gpu/todo.rst with the full plan, with some details. And then
get acks from bridge maintainers. I think Laurent, Sam and Boris
Brezillion are most active right now with shaping the drm_bridge future.

Cheers, Daniel

>
> @Laurent, do you also have suggestions how to proceed?
>
> [1] https://lore.kernel.org/linux-arm-kernel/20200427081952.3536741-1-adrian.ratiu@xxxxxxxxxxxxx/
>
> Thank you,
> Adrian
>
> >
> > Cheers, Daniel
> >
> > >
> > > > +
> > > > +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 = {
> > > > + .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 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_drm_create_encoder(drm, &dsi->encoder, dsi->dev->of_node);
> > > > + if (ret) {
> > > > + DRM_DEV_ERROR(dsi->dev, "failed to create drm encoder\n");
> > > > + return ret;
> > > > + }
> > > > +
> > > > + drm_encoder_helper_add(&dsi->encoder, &imx_mipi_dsi_encoder_helpers);
> > > > +
> > > > + 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@xxxxxxx>");
> > > > +MODULE_AUTHOR("Adrian Ratiu <adrian.ratiu@xxxxxxxxxxxxx>");
> > > > +MODULE_LICENSE("GPL");
> > > > -- > 2.26.0
> > > >
> > >
> > > --
> > > Regards,
> > >
> > > Laurent Pinchart
> > > _______________________________________________
> > > dri-devel mailing list
> > > dri-devel@xxxxxxxxxxxxxxxxxxxxx
> > > https://lists.freedesktop.org/mailman/listinfo/dri-devel
> >
> > --
> > Daniel Vetter
> > Software Engineer, Intel Corporation
> > http://blog.ffwll.ch

--
Daniel Vetter
Software Engineer, Intel Corporation
http://blog.ffwll.ch