Re: [PATCH v5 1/2] drm/bridge: Add sii902x driver

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Hi Boris,

A few comments below ...

2016-06-02 17:00 GMT+02:00 Boris Brezillon <boris.brezillon@xxxxxxxxxxxxxxxxxx>:
> Add basic support for the sii902x RGB -> HDMI bridge.
> This driver does not support audio output yet.
>
> Signed-off-by: Boris Brezillon <boris.brezillon@xxxxxxxxxxxxxxxxxx>
> Tested-by: Nicolas Ferre <nicolas.ferre@xxxxxxxxx>
> ---
> 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@xxxxxxxxx>
> + *
> + * Authors:          Bo Shen <voice.shen@xxxxxxxxx>
> + *                   Boris Brezillon <boris.brezillon@xxxxxxxxxxxxxxxxxx>
> + *                   Wu, Songjun <Songjun.Wu@xxxxxxxxx>
> + *
> + *
> + * 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@xxxxxxxxxxxxxxxxxx>");
> +MODULE_DESCRIPTION("SIL902x RGB -> HDMI bridges");
> +MODULE_LICENSE("GPL");
> --
> 2.7.4
>

Best regards,
  Enric

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> dri-devel mailing list
> dri-devel@xxxxxxxxxxxxxxxxxxxxx
> https://lists.freedesktop.org/mailman/listinfo/dri-devel
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