[PATCH v5 1/2] drm/bridge: Add sii902x driver
Enric Balletbo Serra
eballetbo at gmail.com
Thu Jun 2 21:47:23 UTC 2016
Hi Boris,
A few comments below ...
2016-06-02 17:00 GMT+02:00 Boris Brezillon <boris.brezillon at free-electrons.com>:
> Add basic support for the sii902x RGB -> HDMI bridge.
> This driver does not support audio output yet.
>
> Signed-off-by: Boris Brezillon <boris.brezillon at free-electrons.com>
> Tested-by: Nicolas Ferre <nicolas.ferre at atmel.com>
> ---
> Hello,
>
> This patch is only adding basic support for the sii9022 chip.
> As stated in the commit log, there's no audio support, but the
> driver also hardcodes a lot of things (like the RGB input format to
> use).
>
> Best Regards,
>
> Boris
>
> Changes in v5:
> - drop the best_encoder() implementation
>
> Changes in v4:
> - make reset GPIO optional
> - only support attaching to DRM devices supporting atomic updates
>
> Changes in v3:
> - fix get_modes() implementation to avoid turning the screen in power
> save mode
> - rename the driver (sil902x -> sii902x)
>
> Changes in v2:
> - fix errors reported by the kbuild robot
>
> fixup! drm: bridge: Add sii902x driver
> ---
> drivers/gpu/drm/bridge/Kconfig | 8 +
> drivers/gpu/drm/bridge/Makefile | 1 +
> drivers/gpu/drm/bridge/sii902x.c | 469 +++++++++++++++++++++++++++++++++++++++
> 3 files changed, 478 insertions(+)
> create mode 100644 drivers/gpu/drm/bridge/sii902x.c
>
> diff --git a/drivers/gpu/drm/bridge/Kconfig b/drivers/gpu/drm/bridge/Kconfig
> index 8f7423f..a1419214 100644
> --- a/drivers/gpu/drm/bridge/Kconfig
> +++ b/drivers/gpu/drm/bridge/Kconfig
> @@ -50,6 +50,14 @@ config DRM_PARADE_PS8622
> ---help---
> Parade eDP-LVDS bridge chip driver.
>
> +config DRM_SII902X
> + tristate "Silicon Image sii902x RGB/HDMI bridge"
> + depends on OF
> + select DRM_KMS_HELPER
> + select REGMAP_I2C
> + ---help---
> + Silicon Image sii902x bridge chip driver.
> +
> source "drivers/gpu/drm/bridge/analogix/Kconfig"
>
> endmenu
> diff --git a/drivers/gpu/drm/bridge/Makefile b/drivers/gpu/drm/bridge/Makefile
> index 96b13b3..bfec9f8 100644
> --- a/drivers/gpu/drm/bridge/Makefile
> +++ b/drivers/gpu/drm/bridge/Makefile
> @@ -5,4 +5,5 @@ obj-$(CONFIG_DRM_DW_HDMI) += dw-hdmi.o
> obj-$(CONFIG_DRM_DW_HDMI_AHB_AUDIO) += dw-hdmi-ahb-audio.o
> obj-$(CONFIG_DRM_NXP_PTN3460) += nxp-ptn3460.o
> obj-$(CONFIG_DRM_PARADE_PS8622) += parade-ps8622.o
> +obj-$(CONFIG_DRM_SII902X) += sii902x.o
> obj-$(CONFIG_DRM_ANALOGIX_DP) += analogix/
> diff --git a/drivers/gpu/drm/bridge/sii902x.c b/drivers/gpu/drm/bridge/sii902x.c
> new file mode 100644
> index 0000000..0912d2f
> --- /dev/null
> +++ b/drivers/gpu/drm/bridge/sii902x.c
> @@ -0,0 +1,469 @@
> +/*
> + * Copyright (C) 2014 Atmel
> + * Bo Shen <voice.shen at atmel.com>
> + *
> + * Authors: Bo Shen <voice.shen at atmel.com>
> + * Boris Brezillon <boris.brezillon at free-electrons.com>
> + * Wu, Songjun <Songjun.Wu at atmel.com>
> + *
> + *
> + * Copyright (C) 2010-2011 Freescale Semiconductor, Inc. All Rights Reserved.
> + *
> + * This program is free software; you can redistribute it and/or modify
> + * it under the terms of the GNU General Public License as published by
> + * the Free Software Foundation; either version 2 of the License, or
> + * (at your option) any later version.
> + *
> + * This program is distributed in the hope that it will be useful,
> + * but WITHOUT ANY WARRANTY; without even the implied warranty of
> + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
> + * GNU General Public License for more details.
> + */
> +
> +#include <linux/component.h>
> +#include <linux/gpio/consumer.h>
> +#include <linux/i2c.h>
> +#include <linux/module.h>
> +#include <linux/of.h>
> +#include <linux/of_gpio.h>
> +#include <linux/regmap.h>
> +
> +#include <drm/drmP.h>
> +#include <drm/drm_atomic.h>
> +#include <drm/drm_atomic_helper.h>
> +#include <drm/drm_crtc_helper.h>
> +#include <drm/drm_edid.h>
> +#include <drm/drm_encoder_slave.h>
> +
> +#define SIL902X_TPI_VIDEO_DATA 0x0
> +
> +#define SIL902X_TPI_PIXEL_REPETITION 0x8
> +#define SIL902X_TPI_AVI_PIXEL_REP_BUS_24BIT BIT(5)
> +#define SIL902X_TPI_AVI_PIXEL_REP_RISING_EDGE BIT(4)
> +#define SIL902X_TPI_AVI_PIXEL_REP_4X 3
> +#define SIL902X_TPI_AVI_PIXEL_REP_2X 1
> +#define SIL902X_TPI_AVI_PIXEL_REP_NONE 0
> +#define SIL902X_TPI_CLK_RATIO_HALF (0 << 6)
> +#define SIL902X_TPI_CLK_RATIO_1X (1 << 6)
> +#define SIL902X_TPI_CLK_RATIO_2X (2 << 6)
> +#define SIL902X_TPI_CLK_RATIO_4X (3 << 6)
> +
> +#define SIL902X_TPI_AVI_IN_FORMAT 0x9
> +#define SIL902X_TPI_AVI_INPUT_BITMODE_12BIT BIT(7)
> +#define SIL902X_TPI_AVI_INPUT_DITHER BIT(6)
> +#define SIL902X_TPI_AVI_INPUT_RANGE_LIMITED (2 << 2)
> +#define SIL902X_TPI_AVI_INPUT_RANGE_FULL (1 << 2)
> +#define SIL902X_TPI_AVI_INPUT_RANGE_AUTO (0 << 2)
> +#define SIL902X_TPI_AVI_INPUT_COLORSPACE_BLACK (3 << 0)
> +#define SIL902X_TPI_AVI_INPUT_COLORSPACE_YUV422 (2 << 0)
> +#define SIL902X_TPI_AVI_INPUT_COLORSPACE_YUV444 (1 << 0)
> +#define SIL902X_TPI_AVI_INPUT_COLORSPACE_RGB (0 << 0)
> +
> +#define SIL902X_TPI_AVI_INFOFRAME 0x0c
> +
> +#define SIL902X_SYS_CTRL_DATA 0x1a
> +#define SIL902X_SYS_CTRL_PWR_DWN BIT(4)
> +#define SIL902X_SYS_CTRL_AV_MUTE BIT(3)
> +#define SIL902X_SYS_CTRL_DDC_BUS_REQ BIT(2)
> +#define SIL902X_SYS_CTRL_DDC_BUS_GRTD BIT(1)
> +#define SIL902X_SYS_CTRL_OUTPUT_MODE BIT(0)
> +#define SIL902X_SYS_CTRL_OUTPUT_HDMI 1
> +#define SIL902X_SYS_CTRL_OUTPUT_DVI 0
> +
> +#define SIL902X_REG_CHIPID(n) (0x1b + (n))
> +
> +#define SIL902X_PWR_STATE_CTRL 0x1e
> +#define SIL902X_AVI_POWER_STATE_MSK GENMASK(1, 0)
> +#define SIL902X_AVI_POWER_STATE_D(l) ((l) & SIL902X_AVI_POWER_STATE_MSK)
> +
> +#define SI902X_INT_ENABLE 0x3c
> +#define SI902X_INT_STATUS 0x3d
> +#define SI902X_HOTPLUG_EVENT BIT(0)
> +#define SI902X_PLUGGED_STATUS BIT(2)
> +
> +#define SIL902X_REG_TPI_RQB 0xc7
> +
> +struct sii902x {
> + struct i2c_client *i2c;
> + struct regmap *regmap;
> + struct drm_bridge bridge;
> + struct drm_connector connector;
> + struct gpio_desc *reset_gpio;
> + struct work_struct hotplug_work;
> +};
> +
> +static inline struct sii902x *bridge_to_sii902x(struct drm_bridge *bridge)
> +{
> + return container_of(bridge, struct sii902x, bridge);
> +}
> +
> +static inline struct sii902x *connector_to_sii902x(struct drm_connector *con)
> +{
> + return container_of(con, struct sii902x, connector);
> +}
> +
> +static void sii902x_reset(struct sii902x *sii902x)
> +{
> + if (!sii902x->reset_gpio)
> + return;
> +
> + gpiod_set_value(sii902x->reset_gpio, 1);
> +
> + msleep(100);
> +
> + gpiod_set_value(sii902x->reset_gpio, 0);
> +}
> +
> +static void sii902x_connector_destroy(struct drm_connector *connector)
> +{
> + drm_connector_unregister(connector);
> + drm_connector_cleanup(connector);
> +}
> +
> +static enum drm_connector_status
> +sii902x_connector_detect(struct drm_connector *connector, bool force)
> +{
> + struct sii902x *sii902x = connector_to_sii902x(connector);
> + unsigned int status;
> +
> + regmap_read(sii902x->regmap, SI902X_INT_STATUS, &status);
> +
> + return (status & SI902X_PLUGGED_STATUS) ?
> + connector_status_connected : connector_status_disconnected;
> +}
> +
> +static const struct drm_connector_funcs sii902x_connector_funcs = {
> + .dpms = drm_atomic_helper_connector_dpms,
> + .detect = sii902x_connector_detect,
> + .fill_modes = drm_helper_probe_single_connector_modes,
> + .destroy = sii902x_connector_destroy,
> + .reset = drm_atomic_helper_connector_reset,
> + .atomic_duplicate_state = drm_atomic_helper_connector_duplicate_state,
> + .atomic_destroy_state = drm_atomic_helper_connector_destroy_state,
> +};
> +
> +static int sii902x_get_modes(struct drm_connector *connector)
> +{
> + struct sii902x *sii902x = connector_to_sii902x(connector);
> + struct regmap *regmap = sii902x->regmap;
> + u32 bus_format = MEDIA_BUS_FMT_RGB888_1X24;
> + unsigned int status;
> + struct edid *edid;
> + int num = 0;
> + int ret;
> + int i;
Is the i variable really needed? (see my comments below)
> +
> + ret = regmap_update_bits(regmap, SIL902X_SYS_CTRL_DATA,
> + SIL902X_SYS_CTRL_DDC_BUS_REQ,
> + SIL902X_SYS_CTRL_DDC_BUS_REQ);
> + if (ret)
> + return ret;
> +
> + i = 0;
You assign i to 0
> + do {
> + ret = regmap_read(regmap, SIL902X_SYS_CTRL_DATA, &status);
> + if (ret)
> + return ret;
> + i++;
And you increment i, for what?
> + } while (!(status & SIL902X_SYS_CTRL_DDC_BUS_GRTD));
> +
> + ret = regmap_write(regmap, SIL902X_SYS_CTRL_DATA, status);
> + if (ret)
> + return ret;
> +
> + edid = drm_get_edid(connector, sii902x->i2c->adapter);
> + drm_mode_connector_update_edid_property(connector, edid);
> + if (edid) {
> + num += drm_add_edid_modes(connector, edid);
This is always 0 + the returned value, so you can do:
num = drm_add_edid_modes(connector, edid);
It's more clear for me.
> + kfree(edid);
> + }
> +
> + ret = drm_display_info_set_bus_formats(&connector->display_info,
> + &bus_format, 1);
> + if (ret)
> + return ret;
> +
> + regmap_read(regmap, SIL902X_SYS_CTRL_DATA, &status);
> + if (ret)
> + return ret;
> +
> + ret = regmap_update_bits(regmap, SIL902X_SYS_CTRL_DATA,
> + SIL902X_SYS_CTRL_DDC_BUS_REQ |
> + SIL902X_SYS_CTRL_DDC_BUS_GRTD, 0);
> + if (ret)
> + return ret;
> +
> + i = 0;
Again, you can remove the i variable, here and the i++ from the loop below
> + do {
> + ret = regmap_read(regmap, SIL902X_SYS_CTRL_DATA, &status);
> + if (ret)
> + return ret;
> + i++;
> + } while (status & (SIL902X_SYS_CTRL_DDC_BUS_REQ |
> + SIL902X_SYS_CTRL_DDC_BUS_GRTD));
> +
> + return num;
> +}
> +
> +static enum drm_mode_status sii902x_mode_valid(struct drm_connector *connector,
> + struct drm_display_mode *mode)
> +{
> + /* TODO: check mode */
> +
> + return MODE_OK;
> +}
> +
> +static const struct drm_connector_helper_funcs sii902x_connector_helper_funcs = {
> + .get_modes = sii902x_get_modes,
> + .mode_valid = sii902x_mode_valid,
> +};
> +
> +static void sii902x_bridge_disable(struct drm_bridge *bridge)
> +{
> + struct sii902x *sii902x = bridge_to_sii902x(bridge);
> +
> + regmap_update_bits(sii902x->regmap, SIL902X_SYS_CTRL_DATA,
> + SIL902X_SYS_CTRL_PWR_DWN,
> + SIL902X_SYS_CTRL_PWR_DWN);
> +}
> +
> +static void sii902x_bridge_enable(struct drm_bridge *bridge)
> +{
> + struct sii902x *sii902x = bridge_to_sii902x(bridge);
> +
> + regmap_update_bits(sii902x->regmap, SIL902X_PWR_STATE_CTRL,
> + SIL902X_AVI_POWER_STATE_MSK,
> + SIL902X_AVI_POWER_STATE_D(0));
> + regmap_update_bits(sii902x->regmap, SIL902X_SYS_CTRL_DATA,
> + SIL902X_SYS_CTRL_PWR_DWN, 0);
> +}
> +
> +static void sii902x_bridge_mode_set(struct drm_bridge *bridge,
> + struct drm_display_mode *mode,
> + struct drm_display_mode *adj)
> +{
> + u8 buf[HDMI_INFOFRAME_HEADER_SIZE + HDMI_AVI_INFOFRAME_SIZE];
> + struct sii902x *sii902x = bridge_to_sii902x(bridge);
> + struct regmap *regmap = sii902x->regmap;
> + struct hdmi_avi_infoframe frame;
> + int ret;
> +
> + buf[0] = adj->clock;
> + buf[1] = adj->clock >> 8;
> + buf[2] = adj->vrefresh;
> + buf[3] = 0x00;
> + buf[4] = adj->hdisplay;
> + buf[5] = adj->hdisplay >> 8;
> + buf[6] = adj->vdisplay;
> + buf[7] = adj->vdisplay >> 8;
> + buf[8] = SIL902X_TPI_CLK_RATIO_1X | SIL902X_TPI_AVI_PIXEL_REP_NONE |
> + SIL902X_TPI_AVI_PIXEL_REP_BUS_24BIT;
> + buf[9] = SIL902X_TPI_AVI_INPUT_RANGE_AUTO |
> + SIL902X_TPI_AVI_INPUT_COLORSPACE_RGB;
> +
> + ret = regmap_bulk_write(regmap, SIL902X_TPI_VIDEO_DATA, buf, 10);
> + if (ret)
> + return;
> +
> + ret = drm_hdmi_avi_infoframe_from_display_mode(&frame, adj);
> + if (ret < 0) {
> + DRM_ERROR("couldn't fill AVI infoframe\n");
> + return;
> + }
> +
> + ret = hdmi_avi_infoframe_pack(&frame, buf, sizeof(buf));
> + if (ret < 0) {
> + DRM_ERROR("failed to pack AVI infoframe: %d\n", ret);
> + return;
> + }
> +
> + /* Do not send the infoframe header, but keep the CRC field. */
> + regmap_bulk_write(regmap, SIL902X_TPI_AVI_INFOFRAME,
> + buf + HDMI_INFOFRAME_HEADER_SIZE - 1,
> + HDMI_AVI_INFOFRAME_SIZE + 1);
> +}
> +
> +static int sii902x_bridge_attach(struct drm_bridge *bridge)
> +{
> + struct sii902x *sii902x = bridge_to_sii902x(bridge);
> + struct drm_device *drm = bridge->dev;
> + int ret;
> +
> + drm_connector_helper_add(&sii902x->connector,
> + &sii902x_connector_helper_funcs);
> +
> + if (!drm_core_check_feature(drm, DRIVER_ATOMIC)) {
> + dev_err(&sii902x->i2c->dev,
> + "sii902x driver is only compatible with DRM devices supporting atomic updates");
> + return -ENOTSUPP;
> + }
> +
> + ret = drm_connector_init(drm, &sii902x->connector,
> + &sii902x_connector_funcs,
> + DRM_MODE_CONNECTOR_HDMIA);
> + if (ret)
> + return ret;
> +
> + if (sii902x->i2c->irq > 0)
> + sii902x->connector.polled = DRM_CONNECTOR_POLL_HPD;
> + else
> + sii902x->connector.polled = DRM_CONNECTOR_POLL_CONNECT;
> +
> + drm_mode_connector_attach_encoder(&sii902x->connector, bridge->encoder);
> +
> + return 0;
> +}
> +
> +static void sii902x_bridge_nop(struct drm_bridge *bridge)
> +{
> +}
> +
You can remove this dummy callback function now.
> +static const struct drm_bridge_funcs sii902x_bridge_funcs = {
> + .attach = sii902x_bridge_attach,
> + .mode_set = sii902x_bridge_mode_set,
> + .disable = sii902x_bridge_disable,
> + .post_disable = sii902x_bridge_nop,
> + .pre_enable = sii902x_bridge_nop,
Remove .pre_enable
> + .enable = sii902x_bridge_enable,
> +};
> +
> +static const struct regmap_range sii902x_volatile_ranges[] = {
> + { .range_min = 0, .range_max = 0xff },
> +};
> +
> +static const struct regmap_access_table sii902x_volatile_table = {
> + .yes_ranges = sii902x_volatile_ranges,
> + .n_yes_ranges = ARRAY_SIZE(sii902x_volatile_ranges),
> +};
> +
> +static const struct regmap_config sii902x_regmap_config = {
> + .reg_bits = 8,
> + .val_bits = 8,
> + .volatile_table = &sii902x_volatile_table,
> + .cache_type = REGCACHE_NONE,
> +};
> +
> +static irqreturn_t sii902x_interrupt(int irq, void *data)
> +{
> + struct sii902x *sii902x = data;
> + unsigned int status = 0;
> +
> + regmap_read(sii902x->regmap, SI902X_INT_STATUS, &status);
> + regmap_write(sii902x->regmap, SI902X_INT_STATUS, status);
> +
> + if ((status & SI902X_HOTPLUG_EVENT) && sii902x->bridge.dev)
> + drm_helper_hpd_irq_event(sii902x->bridge.dev);
> +
> + return IRQ_HANDLED;
> +}
> +
> +static int sii902x_probe(struct i2c_client *client,
> + const struct i2c_device_id *id)
> +{
> + struct device *dev = &client->dev;
> + unsigned int status = 0;
> + struct sii902x *sii902x;
> + u8 chipid[4];
> + int ret;
> +
> + sii902x = devm_kzalloc(dev, sizeof(*sii902x), GFP_KERNEL);
> + if (!sii902x)
> + return -ENOMEM;
> +
> + sii902x->i2c = client;
> + sii902x->regmap = devm_regmap_init_i2c(client, &sii902x_regmap_config);
> + if (IS_ERR(sii902x->regmap))
> + return PTR_ERR(sii902x->regmap);
> +
> + sii902x->reset_gpio = devm_gpiod_get_optional(dev, "reset",
> + GPIOD_OUT_LOW);
> + if (IS_ERR(sii902x->reset_gpio))
> + dev_warn(dev, "Failed to retrieve/request reset gpio: %ld\n",
> + PTR_ERR(sii902x->reset_gpio));
> +
> + sii902x_reset(sii902x);
> +
> + ret = regmap_write(sii902x->regmap, SIL902X_REG_TPI_RQB, 0x0);
> + if (ret)
> + return ret;
> +
> + ret = regmap_bulk_read(sii902x->regmap, SIL902X_REG_CHIPID(0),
> + &chipid, 4);
> + if (ret) {
> + dev_err(dev, "regmap_read failed %d\n", ret);
> + return ret;
> + }
> +
> + if (chipid[0] != 0xb0) {
> + dev_err(dev, "Invalid chipid: %02x (expecting 0xb0)\n",
> + chipid[0]);
> + return -EINVAL;
> + }
> +
> + /* Clear all pending interrupts */
> + regmap_read(sii902x->regmap, SI902X_INT_STATUS, &status);
> + regmap_write(sii902x->regmap, SI902X_INT_STATUS, status);
> +
> + if (client->irq > 0) {
> + regmap_write(sii902x->regmap, SI902X_INT_ENABLE,
> + SI902X_HOTPLUG_EVENT);
> +
> + ret = devm_request_threaded_irq(dev, client->irq, NULL,
> + sii902x_interrupt,
> + IRQF_ONESHOT, dev_name(dev),
> + sii902x);
> + if (ret)
> + return ret;
> + }
> +
> + sii902x->bridge.funcs = &sii902x_bridge_funcs;
> + sii902x->bridge.of_node = dev->of_node;
> + ret = drm_bridge_add(&sii902x->bridge);
> + if (ret) {
> + dev_err(dev, "Failed to add drm_bridge\n");
> + return ret;
> + }
> +
> + i2c_set_clientdata(client, sii902x);
> +
> + return 0;
> +}
> +
> +static int sii902x_remove(struct i2c_client *client)
> +
> +{
> + struct sii902x *sii902x = i2c_get_clientdata(client);
> +
> + drm_bridge_remove(&sii902x->bridge);
> +
> + return 0;
> +}
> +
> +#ifdef CONFIG_OF
You already depend on OF in Kconfig so this will always be evaluated.
> +static const struct of_device_id sii902x_dt_ids[] = {
> + { .compatible = "sil,sii9022", },
> + { }
> +};
> +MODULE_DEVICE_TABLE(of, sii902x_dt_ids);
> +#endif
> +
> +static const struct i2c_device_id sii902x_i2c_ids[] = {
> + { "sii9022", 0 },
> + { },
> +};
> +MODULE_DEVICE_TABLE(i2c, sii902x_i2c_ids);
> +
> +static struct i2c_driver sii902x_driver = {
> + .probe = sii902x_probe,
> + .remove = sii902x_remove,
> + .driver = {
> + .name = "sii902x",
> + .of_match_table = of_match_ptr(sii902x_dt_ids),
You already depend on OF in Kconfig so you don't need of_match_ptr()
here, of_match_ptr(x) will always evaluate to x.
> + },
> + .id_table = sii902x_i2c_ids,
> +};
> +module_i2c_driver(sii902x_driver);
> +
> +MODULE_AUTHOR("Boris Brezillon <boris.brezillon at free-electrons.com>");
> +MODULE_DESCRIPTION("SIL902x RGB -> HDMI bridges");
> +MODULE_LICENSE("GPL");
> --
> 2.7.4
>
Best regards,
Enric
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