[PATCH v2 2/3] drm: bridge: add support for lontium LT9611UXC bridge
Sam Ravnborg
sam at ravnborg.org
Fri Aug 28 19:58:44 UTC 2020
Hi Dmitry
On Fri, Aug 28, 2020 at 06:49:05PM +0300, Dmitry Baryshkov wrote:
> Add support for Lontium LT9611UXC HDMI bridge. Lontium LT9611UXC is a
> DSI to HDMI bridge which supports two DSI ports and I2S port as an input
> and HDMI port as output. Despite name being similar to LT9611, these
> devices are different enough to warrant separate driver.
>
> Signed-off-by: Dmitry Baryshkov <dmitry.baryshkov at linaro.org>
I have browsed the driver - most looks good but the way modes are
handled looks fishy.
The code either relies on edid or modes returned by a panel-timings
node. The panel-timings node seems to be used to override the edid info.
We do not need this in any other bridge driver today - and thus it is
questionaable if this driver needs it. If it is needed then please
document the rationale behind it - in the source code.
The binding does not exaplin anything about a panel-timings node.
If the panel-timins stuff is not needed, then remember to drop include
files that are no logner used.
And then there is mode_valid which uses a set of modes obtained from
a static list which also looks strange.
The last part can also be found in lontium-lt9611.c but that does
not make it correct.
Please see other bridge drivers.
The extra patch that makes connector creation optinal should be
merged with the first patch - there is no gain to split it in two.
There was also a few style issues, see comments in the following.
Looks forward to see a new revision.
Sam
> ---
> drivers/gpu/drm/bridge/Kconfig | 13 +
> drivers/gpu/drm/bridge/Makefile | 1 +
> drivers/gpu/drm/bridge/lontium-lt9611uxc.c | 774 +++++++++++++++++++++
> 3 files changed, 788 insertions(+)
> create mode 100644 drivers/gpu/drm/bridge/lontium-lt9611uxc.c
>
> diff --git a/drivers/gpu/drm/bridge/Kconfig b/drivers/gpu/drm/bridge/Kconfig
> index 3e11af4e9f63..8343fb054652 100644
> --- a/drivers/gpu/drm/bridge/Kconfig
> +++ b/drivers/gpu/drm/bridge/Kconfig
> @@ -61,6 +61,19 @@ config DRM_LONTIUM_LT9611
> HDMI signals
> Please say Y if you have such hardware.
>
> +config DRM_LONTIUM_LT9611UXC
> + tristate "Lontium LT9611UXC DSI/HDMI bridge"
> + select SND_SOC_HDMI_CODEC if SND_SOC
> + depends on OF
> + select DRM_PANEL_BRIDGE
> + select DRM_KMS_HELPER
> + select REGMAP_I2C
> + help
> + Driver for Lontium LT9611UXC DSI to HDMI bridge
> + chip driver that converts dual DSI and I2S to
> + HDMI signals
> + Please say Y if you have such hardware.
> +
> config DRM_LVDS_CODEC
> tristate "Transparent LVDS encoders and decoders support"
> depends on OF
> diff --git a/drivers/gpu/drm/bridge/Makefile b/drivers/gpu/drm/bridge/Makefile
> index c589a6a7cbe1..306850a5899b 100644
> --- a/drivers/gpu/drm/bridge/Makefile
> +++ b/drivers/gpu/drm/bridge/Makefile
> @@ -3,6 +3,7 @@ obj-$(CONFIG_DRM_CDNS_DSI) += cdns-dsi.o
> obj-$(CONFIG_DRM_CHRONTEL_CH7033) += chrontel-ch7033.o
> obj-$(CONFIG_DRM_DISPLAY_CONNECTOR) += display-connector.o
> obj-$(CONFIG_DRM_LONTIUM_LT9611) += lontium-lt9611.o
> +obj-$(CONFIG_DRM_LONTIUM_LT9611UXC) += lontium-lt9611uxc.o
> obj-$(CONFIG_DRM_LVDS_CODEC) += lvds-codec.o
> obj-$(CONFIG_DRM_MEGACHIPS_STDPXXXX_GE_B850V3_FW) += megachips-stdpxxxx-ge-b850v3-fw.o
> obj-$(CONFIG_DRM_NXP_PTN3460) += nxp-ptn3460.o
> diff --git a/drivers/gpu/drm/bridge/lontium-lt9611uxc.c b/drivers/gpu/drm/bridge/lontium-lt9611uxc.c
> new file mode 100644
> index 000000000000..77c5aa5c6ad7
> --- /dev/null
> +++ b/drivers/gpu/drm/bridge/lontium-lt9611uxc.c
> @@ -0,0 +1,774 @@
> +// SPDX-License-Identifier: GPL-2.0
> +/*
> + * Copyright (c) 2018, The Linux Foundation. All rights reserved.
> + * Copyright (c) 2019-2020. Linaro Limited.
> + */
> +
> +#include <linux/gpio/consumer.h>
> +#include <linux/interrupt.h>
> +#include <linux/module.h>
> +#include <linux/mutex.h>
> +#include <linux/of_graph.h>
> +#include <linux/platform_device.h>
> +#include <linux/regmap.h>
> +#include <linux/regulator/consumer.h>
> +
> +#include <sound/hdmi-codec.h>
> +
> +#include <video/display_timing.h>
> +#include <video/of_display_timing.h>
> +#include <video/videomode.h>
> +
> +#include <drm/drm_probe_helper.h>
> +#include <drm/drm_atomic_helper.h>
> +#include <drm/drm_bridge.h>
> +#include <drm/drm_mipi_dsi.h>
> +#include <drm/drm_print.h>
Sort this block
> +
> +#define EDID_BLOCK_SIZE 128
> +#define EDID_NUM_BLOCKS 2
> +
> +struct lt9611uxc {
> + struct device *dev;
> + struct drm_bridge bridge;
> +
> + struct regmap *regmap;
> + /* Protects all accesses to registers by stopping the on-chip MCU */
> + struct mutex ocm_lock;
> +
> + struct device_node *dsi0_node;
> + struct device_node *dsi1_node;
> + struct mipi_dsi_device *dsi0;
> + struct mipi_dsi_device *dsi1;
> + struct platform_device *audio_pdev;
> +
> + struct gpio_desc *reset_gpio;
> + struct gpio_desc *enable_gpio;
> +
> + bool sleep;
> +
> + struct regulator_bulk_data supplies[2];
> +
> + struct i2c_client *client;
> +
> + bool hpd_supported;
> + struct display_timings *timings;
> + u8 edid_buf[EDID_BLOCK_SIZE * EDID_NUM_BLOCKS];
> +};
> +
> +#define LT9611_PAGE_CONTROL 0xff
> +
> +static const struct regmap_range_cfg lt9611uxc_ranges[] = {
> + {
> + .name = "register_range",
> + .range_min = 0,
> + .range_max = 0xd0ff,
> + .selector_reg = LT9611_PAGE_CONTROL,
> + .selector_mask = 0xff,
> + .selector_shift = 0,
> + .window_start = 0,
> + .window_len = 0x100,
> + },
> +};
> +
> +static const struct regmap_config lt9611uxc_regmap_config = {
> + .reg_bits = 8,
> + .val_bits = 8,
> + .max_register = 0xffff,
> + .ranges = lt9611uxc_ranges,
> + .num_ranges = ARRAY_SIZE(lt9611uxc_ranges),
> +};
> +
> +struct lt9611uxc_mode {
> + u16 hdisplay;
> + u16 vdisplay;
> + u8 vrefresh;
> + u8 lanes;
> + u8 intfs;
> +};
> +
> +static struct lt9611uxc_mode lt9611uxc_modes[] = {
> + { 3840, 2160, 60, 4, 2 }, /* 3840x2160 24bit 60Hz 4Lane 2ports */
> + { 3840, 2160, 30, 4, 2 }, /* 3840x2160 24bit 30Hz 4Lane 2ports */
> + { 1920, 1080, 60, 4, 1 }, /* 1080P 24bit 60Hz 4lane 1port */
> + { 1920, 1080, 30, 3, 1 }, /* 1080P 24bit 30Hz 3lane 1port */
> + { 1920, 1080, 24, 3, 1 },
> + { 1024, 768, 60, 4, 1},
> + { 800, 600, 60, 4, 1},
> + { 720, 480, 60, 4, 1 },
> + { 720, 576, 50, 2, 1 },
> + { 640, 480, 60, 2, 1 },
> +};
> +
> +static struct lt9611uxc *bridge_to_lt9611uxc(struct drm_bridge *bridge)
> +{
> + return container_of(bridge, struct lt9611uxc, bridge);
> +}
> +
> +static void lt9611uxc_lock(struct lt9611uxc *lt9611uxc)
> +{
> + mutex_lock(<9611uxc->ocm_lock);
> + regmap_write(lt9611uxc->regmap, 0x80ee, 0x01);
> +}
> +
> +static void lt9611uxc_unlock(struct lt9611uxc *lt9611uxc)
> +{
> + regmap_write(lt9611uxc->regmap, 0x80ee, 0x00);
> + msleep(50);
> + mutex_unlock(<9611uxc->ocm_lock);
> +}
If you have the data sheet then please use symbolic names for registers.
> +
> +static irqreturn_t lt9611uxc_irq_thread_handler(int irq, void *dev_id)
> +{
> + struct lt9611uxc *lt9611uxc = dev_id;
> + unsigned int irq_status = 0;
> + unsigned int hpd_status = 0;
> +
> + lt9611uxc_lock(lt9611uxc);
> +
> + regmap_read(lt9611uxc->regmap, 0xb022, &irq_status);
> + if (irq_status) {
> + regmap_write(lt9611uxc->regmap, 0xb022, 0);
> + regmap_read(lt9611uxc->regmap, 0xb023, &hpd_status);
hpd_status is read, but the read value is never used.
> + }
> +
> + lt9611uxc_unlock(lt9611uxc);
> +
> + if (irq_status & 0x3 && lt9611uxc->bridge.dev)
> + drm_kms_helper_hotplug_event(lt9611uxc->bridge.dev);
> +
> + return IRQ_HANDLED;
> +}
> +
> +static void lt9611uxc_reset(struct lt9611uxc *lt9611uxc)
> +{
> + gpiod_set_value_cansleep(lt9611uxc->reset_gpio, 1);
> + msleep(20);
> +
> + gpiod_set_value_cansleep(lt9611uxc->reset_gpio, 0);
> + msleep(20);
> +
> + gpiod_set_value_cansleep(lt9611uxc->reset_gpio, 1);
> + msleep(180);
> +
> + lt9611uxc->sleep = false;
> +}
> +
> +static void lt9611uxc_assert_5v(struct lt9611uxc *lt9611uxc)
> +{
> + if (!lt9611uxc->enable_gpio)
> + return;
> +
> + gpiod_set_value_cansleep(lt9611uxc->enable_gpio, 1);
> + msleep(20);
> +}
> +
> +static int lt9611uxc_regulator_init(struct lt9611uxc *lt9611uxc)
> +{
> + int ret;
> +
> + lt9611uxc->supplies[0].supply = "vdd";
> + lt9611uxc->supplies[1].supply = "vcc";
> +
> + ret = devm_regulator_bulk_get(lt9611uxc->dev, 2, lt9611uxc->supplies);
> + if (ret < 0)
> + return ret;
> +
> + return regulator_set_load(lt9611uxc->supplies[0].consumer, 200000);
> +}
> +
> +static int lt9611uxc_regulator_enable(struct lt9611uxc *lt9611uxc)
> +{
> + int ret;
> +
> + ret = regulator_enable(lt9611uxc->supplies[0].consumer);
> + if (ret < 0)
> + return ret;
> +
> + usleep_range(1000, 10000); /* 50000 according to dtsi */
> +
> + ret = regulator_enable(lt9611uxc->supplies[1].consumer);
> + if (ret < 0) {
> + regulator_disable(lt9611uxc->supplies[0].consumer);
> + return ret;
> + }
> +
> + return 0;
> +}
> +
> +static struct lt9611uxc_mode *lt9611uxc_find_mode(const struct drm_display_mode *mode)
> +{
> + int i;
> +
> + for (i = 0; i < ARRAY_SIZE(lt9611uxc_modes); i++) {
> + if (lt9611uxc_modes[i].hdisplay == mode->hdisplay &&
> + lt9611uxc_modes[i].vdisplay == mode->vdisplay &&
> + lt9611uxc_modes[i].vrefresh == drm_mode_vrefresh(mode)) {
> + return <9611uxc_modes[i];
> + }
> + }
> +
> + return NULL;
> +}
> +
> +static struct mipi_dsi_device *lt9611uxc_attach_dsi(struct lt9611uxc *lt9611uxc,
> + struct device_node *dsi_node)
> +{
> + const struct mipi_dsi_device_info info = { "lt9611uxc", 0, NULL };
> + struct mipi_dsi_device *dsi;
> + struct mipi_dsi_host *host;
> + int ret;
> +
> + host = of_find_mipi_dsi_host_by_node(dsi_node);
> + if (!host) {
> + dev_err(lt9611uxc->dev, "failed to find dsi host\n");
> + return ERR_PTR(-EPROBE_DEFER);
> + }
> +
> + dsi = mipi_dsi_device_register_full(host, &info);
> + if (IS_ERR(dsi)) {
> + dev_err(lt9611uxc->dev, "failed to create dsi device\n");
> + return dsi;
> + }
> +
> + dsi->lanes = 4;
> + dsi->format = MIPI_DSI_FMT_RGB888;
> + dsi->mode_flags = MIPI_DSI_MODE_VIDEO | MIPI_DSI_MODE_VIDEO_SYNC_PULSE |
> + MIPI_DSI_MODE_VIDEO_HSE;
> +
> + ret = mipi_dsi_attach(dsi);
> + if (ret < 0) {
> + dev_err(lt9611uxc->dev, "failed to attach dsi to host\n");
> + mipi_dsi_device_unregister(dsi);
> + return ERR_PTR(ret);
> + }
> +
> + return dsi;
> +}
> +
> +static void lt9611uxc_bridge_detach(struct drm_bridge *bridge)
> +{
> + struct lt9611uxc *lt9611uxc = bridge_to_lt9611uxc(bridge);
> +
> + if (lt9611uxc->dsi1) {
> + mipi_dsi_detach(lt9611uxc->dsi1);
> + mipi_dsi_device_unregister(lt9611uxc->dsi1);
> + }
> +
> + mipi_dsi_detach(lt9611uxc->dsi0);
> + mipi_dsi_device_unregister(lt9611uxc->dsi0);
Hmm, is detach is called twice then thi will fail as the poiters are not
set back to NULL. But I think this is fine - so ignore.
> +}
> +
> +static int lt9611uxc_bridge_attach(struct drm_bridge *bridge,
> + enum drm_bridge_attach_flags flags)
> +{
> + struct lt9611uxc *lt9611uxc = bridge_to_lt9611uxc(bridge);
> + int ret;
> +
> + if (!(flags & DRM_BRIDGE_ATTACH_NO_CONNECTOR)) {
> + dev_err(lt9611uxc->dev, "This bridge driver does not support providing connector!");
> + return -EINVAL;
> + }
> +
> + /* Attach primary DSI */
> + lt9611uxc->dsi0 = lt9611uxc_attach_dsi(lt9611uxc, lt9611uxc->dsi0_node);
> + if (IS_ERR(lt9611uxc->dsi0))
> + return PTR_ERR(lt9611uxc->dsi0);
> +
> + /* Attach secondary DSI, if specified */
> + if (lt9611uxc->dsi1_node) {
> + lt9611uxc->dsi1 = lt9611uxc_attach_dsi(lt9611uxc, lt9611uxc->dsi1_node);
> + if (IS_ERR(lt9611uxc->dsi1)) {
> + ret = PTR_ERR(lt9611uxc->dsi1);
> + goto err_unregister_dsi0;
> + }
> + }
> +
> + return 0;
> +
> +err_unregister_dsi0:
> + mipi_dsi_detach(lt9611uxc->dsi0);
> + mipi_dsi_device_unregister(lt9611uxc->dsi0);
> +
> + return ret;
> +}
> +
> +static enum drm_mode_status
> +lt9611uxc_bridge_mode_valid(struct drm_bridge *bridge,
> + const struct drm_display_info *info,
> + const struct drm_display_mode *mode)
> +{
> + struct lt9611uxc_mode *lt9611uxc_mode;
> +
> + lt9611uxc_mode = lt9611uxc_find_mode(mode);
> +
> + return lt9611uxc_mode ? MODE_OK : MODE_BAD;
> +}
> +
> +static void lt9611uxc_bridge_post_disable(struct drm_bridge *bridge)
> +{
> + struct lt9611uxc *lt9611uxc = bridge_to_lt9611uxc(bridge);
> +
> + lt9611uxc_lock(lt9611uxc);
> + regmap_update_bits(lt9611uxc->regmap, 0xb024, 0x1, 0x1);
> + lt9611uxc->sleep = true;
> + lt9611uxc_unlock(lt9611uxc);
> +}
> +
> +static void lt9611uxc_video_setup(struct lt9611uxc *lt9611uxc,
> + const struct drm_display_mode *mode)
> +{
> + u32 h_total, hactive, hsync_len, hfront_porch;
> + u32 v_total, vactive, vsync_len, vfront_porch;
> +
> + h_total = mode->htotal;
> + v_total = mode->vtotal;
> +
> + hactive = mode->hdisplay;
> + hsync_len = mode->hsync_end - mode->hsync_start;
> + hfront_porch = mode->hsync_start - mode->hdisplay;
> +
> + vactive = mode->vdisplay;
> + vsync_len = mode->vsync_end - mode->vsync_start;
> + vfront_porch = mode->vsync_start - mode->vdisplay;
> +
> + regmap_write(lt9611uxc->regmap, 0xd00d, (u8)(v_total / 256));
> + regmap_write(lt9611uxc->regmap, 0xd00e, (u8)(v_total % 256));
> +
> + regmap_write(lt9611uxc->regmap, 0xd00f, (u8)(vactive / 256));
> + regmap_write(lt9611uxc->regmap, 0xd010, (u8)(vactive % 256));
> +
> + regmap_write(lt9611uxc->regmap, 0xd011, (u8)(h_total / 256));
> + regmap_write(lt9611uxc->regmap, 0xd012, (u8)(h_total % 256));
> +
> + regmap_write(lt9611uxc->regmap, 0xd013, (u8)(hactive / 256));
> + regmap_write(lt9611uxc->regmap, 0xd014, (u8)(hactive % 256));
> +
> + regmap_write(lt9611uxc->regmap, 0xd015, (u8)(vsync_len % 256));
> +
> + regmap_update_bits(lt9611uxc->regmap, 0xd016, 0xf, (u8)(hsync_len / 256));
> + regmap_write(lt9611uxc->regmap, 0xd017, (u8)(hsync_len % 256));
> +
> + regmap_update_bits(lt9611uxc->regmap, 0xd018, 0xf, (u8)(vfront_porch / 256));
> + regmap_write(lt9611uxc->regmap, 0xd019, (u8)(vfront_porch % 256));
> +
> + regmap_update_bits(lt9611uxc->regmap, 0xd01a, 0xf, (u8)(hfront_porch / 256));
> + regmap_write(lt9611uxc->regmap, 0xd01b, (u8)(hfront_porch % 256));
> +}
> +
> +static void lt9611uxc_bridge_mode_set(struct drm_bridge *bridge,
> + const struct drm_display_mode *mode,
> + const struct drm_display_mode *adj_mode)
> +{
> + struct lt9611uxc *lt9611uxc = bridge_to_lt9611uxc(bridge);
> +
> + if (lt9611uxc->sleep)
> + lt9611uxc_reset(lt9611uxc);
> +
> + lt9611uxc_lock(lt9611uxc);
> + lt9611uxc_video_setup(lt9611uxc, mode);
> + lt9611uxc_unlock(lt9611uxc);
> +}
> +
> +static enum drm_connector_status lt9611uxc_bridge_detect(struct drm_bridge *bridge)
> +{
> + struct lt9611uxc *lt9611uxc = bridge_to_lt9611uxc(bridge);
> + unsigned int reg_val = 0;
> + int ret;
> + int connected = 1;
> +
> + if (lt9611uxc->hpd_supported) {
> + lt9611uxc_lock(lt9611uxc);
> + ret = regmap_read(lt9611uxc->regmap, 0xb023, ®_val);
Would it be better to save this value in the irq function?
We read the same register here.
> + lt9611uxc_unlock(lt9611uxc);
> +
> + if (ret)
> + dev_err(lt9611uxc->dev, "failed to read hpd status: %d\n", ret);
So if failed to read status it is considered connected. Hmm..
> + else
> + connected = reg_val & BIT(1);
> + }
> +
> + return connected ? connector_status_connected :
> + connector_status_disconnected;
> +}
> +
> +static int lt9611uxc_bridge_get_modes(struct drm_bridge *bridge,
> + struct drm_connector *connector)
> +{
> + struct lt9611uxc *lt9611uxc = bridge_to_lt9611uxc(bridge);
> + struct display_timings *timings = lt9611uxc->timings;
> + int i;
> +
> + for (i = 0; i < timings->num_timings; i++) {
> + struct drm_display_mode *mode = drm_mode_create(bridge->dev);
> + struct videomode vm;
> +
> + if (videomode_from_timings(timings, &vm, i))
> + break;
> +
> + drm_display_mode_from_videomode(&vm, mode);
> +
> + mode->type = DRM_MODE_TYPE_DRIVER;
> +
> + if (timings->native_mode == i)
> + mode->type |= DRM_MODE_TYPE_PREFERRED;
> +
> + drm_mode_set_name(mode);
> + drm_mode_probed_add(connector, mode);
> + }
> +
> + return i;
> +}
> +
> +static int lt9611uxc_read_edid(struct lt9611uxc *lt9611uxc)
> +{
> + int ret = 0;
> + int i;
> +
> + /* memset to clear old buffer, if any */
> + memset(lt9611uxc->edid_buf, 0, sizeof(lt9611uxc->edid_buf));
> +
> + lt9611uxc_lock(lt9611uxc);
> +
> + regmap_write(lt9611uxc->regmap, 0xb00b, 0x10);
> +
> +#define EDID_SEG 16
> + for (i = 0; i < 2 * EDID_BLOCK_SIZE; i += EDID_SEG) {
> + regmap_write(lt9611uxc->regmap, 0xb00a, i);
> + ret = regmap_noinc_read(lt9611uxc->regmap, 0xb0b0,
> + <9611uxc->edid_buf[i], EDID_SEG);
> + if (ret < 0)
> + break;
> + }
> +
> + lt9611uxc_unlock(lt9611uxc);
> + return ret;
> +}
> +
> +static int lt9611uxc_get_edid_block(void *data, u8 *buf, unsigned int block, size_t len)
> +{
> + struct lt9611uxc *lt9611uxc = data;
> + int ret;
> +
> + if (len > EDID_BLOCK_SIZE)
> + return -EINVAL;
> +
> + if (block >= EDID_NUM_BLOCKS)
> + return -EINVAL;
> +
> + if (block == 0) {
> + ret = lt9611uxc_read_edid(lt9611uxc);
> + if (ret) {
> + dev_err(lt9611uxc->dev, "edid read failed\n");
> + return ret;
> + }
> + }
> +
> + memcpy(buf, lt9611uxc->edid_buf + block * EDID_BLOCK_SIZE, len);
> + return 0;
> +};
> +
> +static struct edid *lt9611uxc_bridge_get_edid(struct drm_bridge *bridge,
> + struct drm_connector *connector)
> +{
> + struct lt9611uxc *lt9611uxc = bridge_to_lt9611uxc(bridge);
> +
> + return drm_do_get_edid(connector, lt9611uxc_get_edid_block, lt9611uxc);
> +}
> +
> +static const struct drm_bridge_funcs lt9611uxc_bridge_funcs = {
> + .attach = lt9611uxc_bridge_attach,
> + .detach = lt9611uxc_bridge_detach,
> + .mode_valid = lt9611uxc_bridge_mode_valid,
> + .post_disable = lt9611uxc_bridge_post_disable,
> + .mode_set = lt9611uxc_bridge_mode_set,
> + .detect = lt9611uxc_bridge_detect,
> + .get_modes = lt9611uxc_bridge_get_modes,
> + .get_edid = lt9611uxc_bridge_get_edid,
> +};
> +
> +static int lt9611uxc_parse_dt(struct device *dev,
> + struct lt9611uxc *lt9611uxc)
> +{
> + lt9611uxc->timings = of_get_display_timings(dev->of_node);
> + if (!lt9611uxc->timings)
> + dev_info(dev, "no display timings provided\n");
> +
> + lt9611uxc->dsi0_node = of_graph_get_remote_node(dev->of_node, 0, -1);
> + if (!lt9611uxc->dsi0_node) {
> + dev_err(lt9611uxc->dev, "failed to get remote node for primary dsi\n");
> + return -ENODEV;
> + }
> +
> + lt9611uxc->dsi1_node = of_graph_get_remote_node(dev->of_node, 1, -1);
> +
> + return 0;
> +}
> +
> +static int lt9611uxc_gpio_init(struct lt9611uxc *lt9611uxc)
> +{
> + struct device *dev = lt9611uxc->dev;
> +
> + lt9611uxc->reset_gpio = devm_gpiod_get(dev, "reset", GPIOD_OUT_HIGH);
> + if (IS_ERR(lt9611uxc->reset_gpio)) {
> + dev_err(dev, "failed to acquire reset gpio\n");
> + return PTR_ERR(lt9611uxc->reset_gpio);
> + }
> +
> + lt9611uxc->enable_gpio = devm_gpiod_get_optional(dev, "enable", GPIOD_OUT_LOW);
> + if (IS_ERR(lt9611uxc->enable_gpio)) {
> + dev_err(dev, "failed to acquire enable gpio\n");
> + return PTR_ERR(lt9611uxc->enable_gpio);
> + }
> +
> + return 0;
> +}
> +
> +static int lt9611uxc_read_device_rev(struct lt9611uxc *lt9611uxc)
> +{
> + unsigned int rev0, rev1, rev2;
> + int ret;
> +
> + lt9611uxc_lock(lt9611uxc);
> +
> + ret = regmap_read(lt9611uxc->regmap, 0x8100, &rev0);
> + ret |= regmap_read(lt9611uxc->regmap, 0x8101, &rev1);
> + ret |= regmap_read(lt9611uxc->regmap, 0x8102, &rev2);
> + if (ret)
> + dev_err(lt9611uxc->dev, "failed to read revision: %d\n", ret);
> + else
> + dev_info(lt9611uxc->dev, "LT9611 revision: 0x%02x.%02x.%02x\n", rev0, rev1, rev2);
> +
> + lt9611uxc_unlock(lt9611uxc);
> +
> + return ret;
> +}
> +
> +static int lt9611uxc_read_version(struct lt9611uxc *lt9611uxc)
> +{
> + unsigned int rev;
> + int ret;
> +
> + lt9611uxc_lock(lt9611uxc);
> +
> + ret = regmap_read(lt9611uxc->regmap, 0xb021, &rev);
> + if (ret)
> + dev_err(lt9611uxc->dev, "failed to read revision: %d\n", ret);
> + else
> + dev_info(lt9611uxc->dev, "LT9611 version: 0x%02x\n", rev);
> +
> + lt9611uxc_unlock(lt9611uxc);
> +
> + return ret < 0 ? ret : rev;
> +}
> +
> +static int lt9611uxc_hdmi_hw_params(struct device *dev, void *data,
> + struct hdmi_codec_daifmt *fmt,
> + struct hdmi_codec_params *hparms)
> +{
> + /*
> + * LT9611UXC will automatically detect rate and sample size, so no need
> + * to setup anything here.
> + */
> + return 0;
> +}
> +
> +static void lt9611uxc_audio_shutdown(struct device *dev, void *data)
> +{
> +}
> +
> +static int lt9611uxc_hdmi_i2s_get_dai_id(struct snd_soc_component *component,
> + struct device_node *endpoint)
> +{
> + struct of_endpoint of_ep;
> + int ret;
> +
> + ret = of_graph_parse_endpoint(endpoint, &of_ep);
> + if (ret < 0)
> + return ret;
> +
> + /*
> + * HDMI sound should be located as reg = <2>
> + * Then, it is sound port 0
> + */
> + if (of_ep.port == 2)
> + return 0;
> +
> + return -EINVAL;
> +}
> +
> +static const struct hdmi_codec_ops lt9611uxc_codec_ops = {
> + .hw_params = lt9611uxc_hdmi_hw_params,
> + .audio_shutdown = lt9611uxc_audio_shutdown,
> + .get_dai_id = lt9611uxc_hdmi_i2s_get_dai_id,
> +};
Is an audio_startup() operation missing here?
> +
> +static int lt9611uxc_audio_init(struct device *dev, struct lt9611uxc *lt9611uxc)
> +{
> + struct hdmi_codec_pdata codec_data = {
> + .ops = <9611uxc_codec_ops,
> + .max_i2s_channels = 2,
> + .i2s = 1,
> + .data = lt9611uxc,
> + };
> +
> + lt9611uxc->audio_pdev =
> + platform_device_register_data(dev, HDMI_CODEC_DRV_NAME,
> + PLATFORM_DEVID_AUTO,
> + &codec_data, sizeof(codec_data));
> +
> + return PTR_ERR_OR_ZERO(lt9611uxc->audio_pdev);
> +}
> +
> +static void lt9611uxc_audio_exit(struct lt9611uxc *lt9611uxc)
> +{
> + if (lt9611uxc->audio_pdev) {
> + platform_device_unregister(lt9611uxc->audio_pdev);
> + lt9611uxc->audio_pdev = NULL;
> + }
> +}
> +
> +static int lt9611uxc_probe(struct i2c_client *client,
> + const struct i2c_device_id *id)
> +{
> + struct lt9611uxc *lt9611uxc;
> + struct device *dev = &client->dev;
> + int ret;
> +
> + if (!i2c_check_functionality(client->adapter, I2C_FUNC_I2C)) {
> + dev_err(dev, "device doesn't support I2C\n");
> + return -ENODEV;
> + }
> +
> + lt9611uxc = devm_kzalloc(dev, sizeof(*lt9611uxc), GFP_KERNEL);
> + if (!lt9611uxc)
> + return -ENOMEM;
> +
> + lt9611uxc->dev = &client->dev;
> + lt9611uxc->client = client;
> + mutex_init(<9611uxc->ocm_lock);
> +
> + lt9611uxc->regmap = devm_regmap_init_i2c(client, <9611uxc_regmap_config);
> + if (IS_ERR(lt9611uxc->regmap)) {
> + dev_err(lt9611uxc->dev, "regmap i2c init failed\n");
> + return PTR_ERR(lt9611uxc->regmap);
> + }
> +
> + ret = lt9611uxc_parse_dt(&client->dev, lt9611uxc);
> + if (ret) {
> + dev_err(dev, "failed to parse device tree\n");
> + return ret;
> + }
> +
> + ret = lt9611uxc_gpio_init(lt9611uxc);
> + if (ret < 0)
> + goto err_of_put;
> +
> + ret = lt9611uxc_regulator_init(lt9611uxc);
> + if (ret < 0)
> + goto err_of_put;
> +
> + lt9611uxc_assert_5v(lt9611uxc);
> +
> + ret = lt9611uxc_regulator_enable(lt9611uxc);
> + if (ret)
> + goto err_of_put;
> +
> + lt9611uxc_reset(lt9611uxc);
> +
> + ret = lt9611uxc_read_device_rev(lt9611uxc);
> + if (ret) {
> + dev_err(dev, "failed to read chip rev\n");
> + goto err_disable_regulators;
> + }
> +
> + ret = lt9611uxc_read_version(lt9611uxc);
> + if (ret < 0) {
> + dev_err(dev, "failed to read FW version\n");
> + goto err_disable_regulators;
> + } else if (ret == 0) {
> + dev_err(dev, "FW version 0, FW update not supported\n");
> + ret = -EOPNOTSUPP;
> + goto err_disable_regulators;
> + } else if (ret < 0x40) {
> + dev_info(dev, "FW version 0x%x, HPD not supported\n", ret);
> + } else {
> + lt9611uxc->hpd_supported = true;
> + }
> +
> + ret = devm_request_threaded_irq(dev, client->irq, NULL,
> + lt9611uxc_irq_thread_handler,
> + IRQF_ONESHOT, "lt9611uxc", lt9611uxc);
> + if (ret) {
> + dev_err(dev, "failed to request irq\n");
> + goto err_disable_regulators;
> + }
> +
> + i2c_set_clientdata(client, lt9611uxc);
> +
> + lt9611uxc->bridge.funcs = <9611uxc_bridge_funcs;
> + lt9611uxc->bridge.of_node = client->dev.of_node;
> + lt9611uxc->bridge.ops = DRM_BRIDGE_OP_DETECT;
> + if (lt9611uxc->timings)
> + lt9611uxc->bridge.ops |= DRM_BRIDGE_OP_MODES;
> + else
> + lt9611uxc->bridge.ops |= DRM_BRIDGE_OP_EDID;
> + if (lt9611uxc->hpd_supported)
> + lt9611uxc->bridge.ops |= DRM_BRIDGE_OP_HPD;
> + lt9611uxc->bridge.type = DRM_MODE_CONNECTOR_HDMIA;
> +
> + drm_bridge_add(<9611uxc->bridge);
> +
> + return lt9611uxc_audio_init(dev, lt9611uxc);
> +
> +err_disable_regulators:
> + regulator_bulk_disable(ARRAY_SIZE(lt9611uxc->supplies), lt9611uxc->supplies);
> +
> +err_of_put:
> + of_node_put(lt9611uxc->dsi1_node);
> + of_node_put(lt9611uxc->dsi0_node);
> +
> + return ret;
> +}
> +
> +static int lt9611uxc_remove(struct i2c_client *client)
> +{
> + struct lt9611uxc *lt9611uxc = i2c_get_clientdata(client);
> +
> + disable_irq(client->irq);
> + lt9611uxc_audio_exit(lt9611uxc);
> + drm_bridge_remove(<9611uxc->bridge);
> +
> + mutex_destroy(<9611uxc->ocm_lock);
> +
> + regulator_bulk_disable(ARRAY_SIZE(lt9611uxc->supplies), lt9611uxc->supplies);
> +
> + of_node_put(lt9611uxc->dsi1_node);
> + of_node_put(lt9611uxc->dsi0_node);
> +
> + return 0;
> +}
> +
> +static struct i2c_device_id lt9611uxc_id[] = {
> + { "lontium,lt9611uxc", 0 },
> + {}
> +};
> +
> +static const struct of_device_id lt9611uxc_match_table[] = {
> + { .compatible = "lontium,lt9611uxc" },
> + { }
{ /* sentinel */ },
> +};
> +MODULE_DEVICE_TABLE(of, lt9611uxc_match_table);
> +
> +static struct i2c_driver lt9611uxc_driver = {
> + .driver = {
> + .name = "lt9611uxc",
> + .of_match_table = lt9611uxc_match_table,
> + },
> + .probe = lt9611uxc_probe,
> + .remove = lt9611uxc_remove,
> + .id_table = lt9611uxc_id,
> +};
> +module_i2c_driver(lt9611uxc_driver);
> +
> +MODULE_LICENSE("GPL v2");
> --
> 2.28.0
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