[PATCH v11 2/2] drm/bridge: Add I2C based driver for ps8640 bridge
Daniel Kurtz
djkurtz at chromium.org
Sat Feb 27 19:32:34 PST 2016
Hi Jitao,
Getting very close now...
Comments inline...
On Tue, Feb 23, 2016 at 3:35 PM, Jitao Shi <jitao.shi at mediatek.com> wrote:
> This patch adds drm_bridge driver for parade DSI to eDP bridge chip.
>
> Signed-off-by: Jitao Shi <jitao.shi at mediatek.com>
> ---
> Changes since v10:
> - Tuning PS8640 reset sleep pins squence
>
> The following patches are needed to support dsi host through none dsi bus:
>
> https://patchwork.kernel.org/patch/8289181/ ("drm/dsi: check for CONFIG_OF when defining")
> https://patchwork.kernel.org/patch/8289051/ ("drm/dsi: Use mipi_dsi_device_register_full for DSI device")
> https://patchwork.kernel.org/patch/8289081/ ("drm/dsi: Try to match non-DT DSI devices")
> https://patchwork.kernel.org/patch/8289121/ ("drm/dsi: Add routine to unregister a DSI device")
> https://patchwork.kernel.org/patch/8289091/ ("drm/dsi: Get DSI host by DT device node")
> ---
> drivers/gpu/drm/bridge/Kconfig | 11 +
> drivers/gpu/drm/bridge/Makefile | 1 +
> drivers/gpu/drm/bridge/parade-ps8640.c | 1060 ++++++++++++++++++++++++++++++++
> 3 files changed, 1072 insertions(+)
> create mode 100644 drivers/gpu/drm/bridge/parade-ps8640.c
>
> diff --git a/drivers/gpu/drm/bridge/Kconfig b/drivers/gpu/drm/bridge/Kconfig
> index 27e2022..b4edd8c 100644
> --- a/drivers/gpu/drm/bridge/Kconfig
> +++ b/drivers/gpu/drm/bridge/Kconfig
> @@ -40,4 +40,15 @@ config DRM_PARADE_PS8622
> ---help---
> Parade eDP-LVDS bridge chip driver.
>
> +config DRM_PARADE_PS8640
> + tristate "Parade PS8640 MIPI DSI to eDP Converter"
> + depends on OF && I2C
To remove the cyclic dependency on I2C, remove the I2C, and replace with:
depends on DRM
depends on OF
> + select DRM_KMS_HELPER
> + select DRM_MIPI_DSI
> + select DRM_PANEL
> + ---help---
> + Choose this option if you have PS8640 for display
> + The PS8640 is a high-performance and low-power
> + MIPI DSI to eDP converter
> +
> endmenu
[snip]
> diff --git a/drivers/gpu/drm/bridge/parade-ps8640.c b/drivers/gpu/drm/bridge/parade-ps8640.c
> new file mode 100644
> index 0000000..d7410df
> --- /dev/null
> +++ b/drivers/gpu/drm/bridge/parade-ps8640.c
[snip]
> +static int ps8640_write_bytes(struct i2c_client *client, u8 *data,
> + u16 data_len)
const u8 *data
> +{
> + int ret;
> + struct i2c_msg msg;
> +
> + msg.addr = client->addr;
> + msg.flags = 0;
> + msg.len = data_len;
> + msg.buf = data;
> +
> + ret = i2c_transfer(client->adapter, &msg, 1);
> + if (ret == 1)
> + return 0;
> + if (ret < 0)
> + return ret;
> + else
> + return -EIO;
> +}
> +
> +static int ps8640_write_byte(struct i2c_client *client, u8 reg, u8 data)
nit: (extra space before "u8 data".
Also, just reuse ps8640_write_bytes, so like this:
static int ps8640_write_byte(struct i2c_client *client, u8 reg, u8 data)
{
u8 buf[] = {reg, data};
return ps8640_write_bytes(client, buf, 2);
}
> +{
> + int ret;
> + struct i2c_msg msg;
> + u8 buf[] = {reg, data};
> +
> + msg.addr = client->addr;
> + msg.flags = 0;
> + msg.len = sizeof(buf);
> + msg.buf = buf;
> +
> + ret = i2c_transfer(client->adapter, &msg, 1);
> + if (ret == 1)
> + return 0;
> + if (ret < 0)
> + return ret;
> + else
> + return -EIO;
> +}
[snip]
> +static void ps8640_pre_enable(struct drm_bridge *bridge)
> +{
> + struct ps8640 *ps_bridge = bridge_to_ps8640(bridge);
> + struct i2c_client *client = ps_bridge->page[2];
> + int err, retry_cnt = 0;
> + u8 set_vdo_done;
> +
> + if (ps_bridge->in_fw_update)
> + return;
> +
> + if (ps_bridge->enabled)
> + return;
> +
> + err = drm_panel_prepare(ps_bridge->panel);
> + if (err < 0) {
> + DRM_ERROR("failed to prepare panel: %d\n", err);
> + return;
> + }
> +
> + err = regulator_bulk_enable(ARRAY_SIZE(ps_bridge->supplies),
> + ps_bridge->supplies);
> + if (err < 0) {
> + DRM_ERROR("cannot enable regulators %d\n", err);
> + goto err_panel_unprepare;
> + }
> +
> + gpiod_set_value(ps_bridge->gpio_slp_n, 1);
> + gpiod_set_value(ps_bridge->gpio_rst_n, 0);
> + usleep_range(2000, 2500);
> + gpiod_set_value(ps_bridge->gpio_rst_n, 1);
> +
> + /*
> + * Wait for the ps8640 embed mcu ready
> + * First wait 200ms and then check the mcu ready flag every 20ms
> + */
> + msleep(200);
> + do {
> + err = ps8640_read(client, PAGE2_GPIO_H, &set_vdo_done, 1);
> + if (err < 0) {
> + DRM_ERROR("failed read PAGE2_GPIO_H: %d\n", err);
> + goto err_regulators_disable;
> + }
> + msleep(20);
This wastes 20 ms on success.
Use the routines in <linux/iopoll.h> for polling loops like this.
> + } while ((retry_cnt++ < 10) && ((set_vdo_done & PS_GPIO9) != PS_GPIO9));
> +
> + if (ps_bridge->info.version == 0)
> + ps8640_get_mcu_fw_version(ps_bridge);
> + /* Switch access edp panel's edid through i2c */
> + ps8640_write_byte(client, PAGE2_I2C_BYPASS, I2C_BYPASS_EN);
> + ps_bridge->enabled = true;
> +
> + return;
> +
> +err_regulators_disable:
> + regulator_bulk_disable(ARRAY_SIZE(ps_bridge->supplies),
> + ps_bridge->supplies);
> +err_panel_unprepare:
> + drm_panel_unprepare(ps_bridge->panel);
> +}
[snip]
> +static int ps8640_get_modes(struct drm_connector *connector)
> +{
> + struct ps8640 *ps_bridge = connector_to_ps8640(connector);
> + struct device *dev = &ps_bridge->page[0]->dev;
> + u8 *edid;
> + int ret, num_modes = 0;
> + bool power_off;
> +
> + if (ps_bridge->edid)
> + return drm_add_edid_modes(connector, ps_bridge->edid);
> +
> + power_off = !ps_bridge->enabled;
> + ps8640_pre_enable(&ps_bridge->bridge);
> +
> + edid = devm_kmalloc(dev, EDID_LENGTH, GFP_KERNEL);
> + if (!edid) {
> + DRM_ERROR("Failed to allocate EDID\n");
> + return 0;
> + }
> +
> + ret = ps8640_read(ps_bridge->ddc_i2c, 0, edid, EDID_LENGTH);
> + if (ret)
> + goto out;
> +
> + ps_bridge->edid = (struct edid *)edid;
> + drm_mode_connector_update_edid_property(connector, ps_bridge->edid);
> +
> + num_modes = drm_add_edid_modes(connector, ps_bridge->edid);
> +
> +out:
> + if (power_off)
> + ps8640_post_disable(&ps_bridge->bridge);
> +
> + return num_modes;
> +}
> +
> +static struct drm_encoder *ps8640_best_encoder(struct drm_connector *connector)
> +{
> + struct ps8640 *ps_bridge;
> +
> + ps_bridge = connector_to_ps8640(connector);
nit:
struct ps8640 *ps_bridge = connector_to_ps8640(connector);
> + return ps_bridge->bridge.encoder;
> +}
[snip]
> +int ps8640_bridge_attach(struct drm_bridge *bridge)
> +{
> + struct ps8640 *ps_bridge = bridge_to_ps8640(bridge);
> + struct device *dev = &ps_bridge->page[0]->dev;
> + struct device_node *np = dev->of_node;
> + struct device_node *port, *in_ep;
> + struct device_node *dsi_node = NULL;
> + struct mipi_dsi_host *host = ps_bridge->dsi.host;
> + int ret;
> +
> + ret = drm_connector_init(bridge->dev, &ps_bridge->connector,
> + &ps8640_connector_funcs,
> + DRM_MODE_CONNECTOR_eDP);
> +
> + if (ret) {
> + DRM_ERROR("Failed to initialize connector with drm: %d\n", ret);
> + return ret;
> + }
> +
> + drm_connector_helper_add(&ps_bridge->connector,
> + &ps8640_connector_helper_funcs);
> + drm_connector_register(&ps_bridge->connector);
> +
> + ps_bridge->connector.dpms = DRM_MODE_DPMS_ON;
> + drm_mode_connector_attach_encoder(&ps_bridge->connector,
> + bridge->encoder);
> +
> + if (ps_bridge->panel)
> + drm_panel_attach(ps_bridge->panel, &ps_bridge->connector);
> +
> + /* port at 0 is ps8640 dsi input port */
> + port = of_graph_get_port_by_id(np, 0);
> + if (port) {
> + in_ep = of_get_child_by_name(port, "endpoint");
> + of_node_put(port);
> + if (in_ep) {
> + dsi_node = of_graph_get_remote_port_parent(in_ep);
> + of_node_put(in_ep);
> + }
> + }
> + if (dsi_node) {
> + host = of_find_mipi_dsi_host_by_node(dsi_node);
> + of_node_put(dsi_node);
> + if (!host)
> + return -ENODEV;
Missing drm_panel_detach on error
Missing drm_connector_unregister/drm_connector_cleanup on error
> + }
> +
> + ps_bridge->dsi.host = host;
> + ps_bridge->dsi.mode_flags = MIPI_DSI_MODE_VIDEO |
> + MIPI_DSI_MODE_VIDEO_SYNC_PULSE;
> + ps_bridge->dsi.format = MIPI_DSI_FMT_RGB888;
> + ps_bridge->dsi.lanes = 4;
> + ret = mipi_dsi_attach(&ps_bridge->dsi);
> + if (ret) {
> + drm_panel_detach(ps_bridge->panel);
> + return ret;
Missing drm_connector_unregister/drm_connector_cleanup on error
> + }
> +
> + return ret;
> +}
> +
> +static const struct drm_bridge_funcs ps8640_bridge_funcs = {
> + .attach = ps8640_bridge_attach,
> + .disable = ps8640_disable,
> + .post_disable = ps8640_post_disable,
> + .pre_enable = ps8640_pre_enable,
> + .enable = ps8640_enable,
> +};
> +
> +/* Firmware Version is returned as Major.Minor.Build */
> +static ssize_t ps8640_fw_version_show(struct device *dev,
> + struct device_attribute *attr, char *buf)
> +{
> + struct ps8640 *ps_bridge = dev_get_drvdata(dev);
> + struct ps8640_info *info = &ps_bridge->info;
> +
> + return scnprintf(buf, PAGE_SIZE, "%u.%u\n", info->version >> 8,
> + info->version & 0xff);
> +}
> +
> +/* Hardware Version is returned as FamilyID.VariantID */
> +static ssize_t ps8640_hw_version_show(struct device *dev,
> + struct device_attribute *attr, char *buf)
> +{
> + struct ps8640 *ps_bridge = dev_get_drvdata(dev);
> + struct ps8640_info *info = &ps_bridge->info;
> +
> + return scnprintf(buf, PAGE_SIZE, "ps%u.%u\n", info->family_id,
> + info->variant_id);
> +}
> +
> +static int ps8640_spi_send_cmd(struct ps8640 *ps_bridge, u8 *cmd, u8 cmd_len)
> +{
> + struct i2c_client *client = ps_bridge->page[2];
> + u8 i, buf[3];
> + int ret;
> +
> + ret = ps8640_write_byte(client, PAGE2_IROM_CTRL, IROM_ENABLE);
> + if (ret)
> + goto err;
> +
> + /* write command in write port */
> + for (i = 0; i < cmd_len; i++) {
> + ret = ps8640_write_byte(client, PAGE2_SWSPI_WDATA, cmd[i]);
> + if (ret)
> + goto err;
Still do IROM_DISABLE on failure?
> + }
> +
> + buf[0] = PAGE2_SWSPI_LEN;
> + buf[1] = cmd_len - 1;
> + buf[2] = TRIGGER_NO_READBACK;
> + ret = ps8640_write_bytes(client, buf, 3);
> + if (ret)
> + goto err;
Still do IROM_DISABLE on failure?
> +
> + ret = ps8640_write_byte(client, PAGE2_IROM_CTRL, IROM_DISABLE);
> + if (ret)
> + goto err;
> +
> + return 0;
> +
> +err:
> + dev_err(&client->dev, "send command err: %d\n", ret);
> + return ret;
> +}
> +
> +static int ps8640_wait_spi_ready(struct ps8640 *ps_bridge)
> +{
> + struct i2c_client *client = ps_bridge->page[2];
> + u8 spi_rdy_st, retry_cnt = 0;
> +
> + do {
> + ps8640_read(client, PAGE2_SPI_STATUS, &spi_rdy_st, 1);
> + msleep(20);
This wastes 20 ms on success.
Use the routines in <linux/iopoll.h> for polling loops like this.
> + if ((retry_cnt == SPI_MAX_RETRY_CNT) &&
> + ((spi_rdy_st & 0x0c) != 0x0c)) {
> + dev_err(&client->dev, "wait spi ready timeout\n");
> + return -EBUSY;
> + }
> + } while ((retry_cnt++ < SPI_MAX_RETRY_CNT) &&
> + (spi_rdy_st & 0x0c) == 0x0c);
> +
> + return 0;
> +}
> +
> +static int ps8640_wait_spi_nobusy(struct ps8640 *ps_bridge)
> +{
> + struct i2c_client *client = ps_bridge->page[2];
> + u8 spi_status, buf[3], retry_cnt = 0;
> + int ret;
> +
> + do {
> + /* 0x05 RDSR; Read-Status-Register */
> + ret = ps8640_write_byte(client, PAGE2_SWSPI_WDATA,
> + READ_STATUS_REG_CMD);
> + if (ret)
> + goto err_send_cmd_exit;
> +
> + buf[0] = PAGE2_SWSPI_LEN;
> + buf[1] = 0;
> + buf[2] = TRIGGER_READBACK;
> + ret = ps8640_write_bytes(client, buf, 3);
> + if (ret)
> + goto err_send_cmd_exit;
> +
> + /* delay for cmd send */
> + usleep_range(100, 300);
> + /* wait for SPI ROM until not busy */
> + ret = ps8640_read(client, PAGE2_SWSPI_RDATA, &spi_status, 1);
> + if (ret)
> + goto err_send_cmd_exit;
> + } while ((retry_cnt++ < SPI_MAX_RETRY_CNT) &&
> + (spi_status & BLK_PROTECT_BITS) == BLK_PROTECT_BITS);
> +
> + if ((retry_cnt > SPI_MAX_RETRY_CNT) &&
> + (spi_status & BLK_PROTECT_BITS) != BLK_PROTECT_BITS) {
> + ret = -EBUSY;
> + dev_err(&client->dev, "wait spi no busy timeout: %d\n", ret);
> + goto err_timeout;
just "return -EBUSY".
> + }
> +
> + return 0;
> +
> +err_send_cmd_exit:
> + dev_err(&client->dev, "send command err: %d\n", ret);
> +
> +err_timeout:
> + return ret;
> +}
> +
> +static int ps8640_wait_rom_idle(struct ps8640 *ps_bridge)
> +{
> + struct i2c_client *client = ps_bridge->page[0];
> + int ret;
> +
> + ret = ps8640_write_byte(client, PAGE2_IROM_CTRL, IROM_ENABLE);
> + if (ret)
> + goto exit;
> +
> + ret = ps8640_wait_spi_ready(ps_bridge);
> + if (ret)
> + goto exit;
> +
> + ret = ps8640_wait_spi_nobusy(ps_bridge);
> + if (ret)
If either ready/nobusy fail, should we still do IROM_DISABLE?
> + goto exit;
> +
> + ret = ps8640_write_byte(client, PAGE2_IROM_CTRL, IROM_DISABLE);
> + if (ret)
> + goto exit;
> +
> +exit:
> + if (ret)
> + dev_err(&client->dev, "wait ps8640 rom idle fail: %d\n", ret);
> +
> + return ret;
> +}
> +
> +static int ps8640_spi_dl_mode(struct ps8640 *ps_bridge)
> +{
> + struct i2c_client *client = ps_bridge->page[2];
> + int ret;
> +
> + /* switch ps8640 mode to spi dl mode */
> + gpiod_set_value(ps_bridge->gpio_mode_sel_n, 0);
> +
> + /* reset spi interface */
> + ret = ps8640_write_byte(client, PAGE2_SW_REST,
> + SPI_SW_RESET | MPU_SW_RESET);
> + if (ret)
> + goto exit;
> +
> + ret = ps8640_write_byte(client, PAGE2_SW_REST, MPU_SW_RESET);
> + if (ret)
> + goto exit;
> +
> +exit:
> + if (ret)
> + dev_err(&client->dev, "fail reset spi interface: %d\n", ret);
> +
> + return ret;
> +}
> +
> +static int ps8640_rom_prepare(struct ps8640 *ps_bridge)
> +{
> + struct i2c_client *client = ps_bridge->page[2];
> + struct device *dev = &client->dev;
> + u8 i, cmd[2];
> + int ret;
> +
> + cmd[0] = WRITE_ENABLE_CMD;
> + ret = ps8640_spi_send_cmd(ps_bridge, cmd, 1);
> + if (ret) {
> + dev_err(dev, "failed enable-write-status-register: %d\n", ret);
> + return ret;
> + }
> +
> + cmd[0] = WRITE_STATUS_REG_CMD;
> + cmd[1] = CLEAR_ALL_PROTECT;
> + ret = ps8640_spi_send_cmd(ps_bridge, cmd, 2);
> + if (ret) {
> + dev_err(dev, "fail disable all protection: %d\n", ret);
> + return ret;
> + }
> +
> + /* wait for SPI module ready */
> + ret = ps8640_wait_rom_idle(ps_bridge);
> + if (ret) {
> + dev_err(dev, "fail wait rom idle: %d\n", ret);
If this fails, should we undo "WRITE_ENABLE_CMD" and/or
"CLEAR_ALL_PROTECT" above?
> + return ret;
> + }
> +
> + ps8640_write_byte(client, PAGE2_IROM_CTRL, IROM_ENABLE);
> + for (i = 0; i < 6; i++)
> + ps8640_write_byte(client, PAGE2_ENCTLSPI_WR, enc_ctrl_code[i]);
> + ps8640_write_byte(client, PAGE2_IROM_CTRL, IROM_DISABLE);
> +
> + /* Enable-Write-Status-Register */
> + cmd[0] = WRITE_ENABLE_CMD;
> + ret = ps8640_spi_send_cmd(ps_bridge, cmd, 1);
> + if (ret) {
> + dev_err(dev, "fail enable-write-status-register: %d\n", ret);
> + return ret;
> + }
> +
> + /* chip erase command */
> + cmd[0] = CHIP_ERASE_CMD;
> + ret = ps8640_spi_send_cmd(ps_bridge, cmd, 1);
> + if (ret) {
> + dev_err(dev, "fail disable all protection: %d\n", ret);
> + return ret;
> + }
> +
> + ret = ps8640_wait_rom_idle(ps_bridge);
> + if (ret) {
> + dev_err(dev, "fail wait rom idle: %d\n", ret);
> + return ret;
> + }
> +
> + return 0;
> +}
> +
> +static int ps8640_validate_firmware(struct ps8640 *ps_bridge,
> + const struct firmware *fw)
> +{
> + struct i2c_client *client = ps_bridge->page[0];
> + struct ps8640_info *info = &ps_bridge->info;
> + u16 fw_chip_id, fw_version_id;
> +
> + /*
> + * Get the chip_id from the firmware. Make sure that it is the
> + * right controller to do the firmware and config update.
> + */
> + fw_chip_id = get_unaligned_le16(fw->data + FW_CHIP_ID_OFFSET);
> +
> + if (fw_chip_id != 0x8640) {
Shouldn't we be comparing to something read from the device rather than a
hard-coded value? Perhaps (info->family_id, info->variant_id)?
> + dev_err(&client->dev,
> + "chip id mismatch: fw 0x%x vs. chip 0x8640\n",
> + fw_chip_id);
> + return -ENODEV;
This error means that the firmware file provided by userspace is invalid, so:
return -EINVAL;
> + }
> +
> + fw_version_id = get_unaligned_le16(fw->data + FW_VERSION_OFFSET);
> +
> + if (fw_version_id == info->version) {
> + dev_err(&client->dev,
> + "no need update fw version same: fw %d.%d vs. chip %d.%d\n",
> + fw_version_id >> 8, fw_version_id & 0xff,
> + info->version >> 8, info->version & 0xff);
> + return -ENODEV;
This is not an error. Just return 0.
Or, perhaps just remove this check and just allow userspace to
re-write the same version.
There are cases where this is valid:
(a) to test firmware update
(b) b/c userspace doesn't trust the old firmware despite what version
it reports
(c) b/c of suspected flash corruption, etc.
Anyway, this is 'policy', and shouldn't be handled here in the kernel driver.
> + }
> +
> + return 0;
> +}
> +
> +static int ps8640_write_rom(struct ps8640 *ps_bridge, const struct firmware *fw)
> +{
> + struct i2c_client *client = ps_bridge->page[0];
> + struct device *dev = &client->dev;
> + struct i2c_client *client2 = ps_bridge->page[2];
> + struct i2c_client *client7 = ps_bridge->page[7];
> + unsigned int pos = 0;
> + u8 buf[257], rom_page_id_buf[3];
> + int ret;
> + u16 cpy_len;
> +
> + ps8640_write_byte(client2, PAGE2_SPI_CFG3, I2C_TO_SPI_RESET);
> + msleep(100);
> + ps8640_write_byte(client2, PAGE2_SPI_CFG3, 0x00);
> +
> + while (pos < fw->size) {
style nit:
This 'while' would work better as a for loop:
for (pos = 0; pos < fw->size; pos += cpy_len)
> + rom_page_id_buf[0] = PAGE2_ROMADD_BYTE1;
> + rom_page_id_buf[1] = (pos >> 8) & 0xff;
> + rom_page_id_buf[2] = (pos >> 16) & 0xff;
Remove "& 0xff" from the two lines above b/c rom_page_id_buf[] is a u8 array.
> + ret = ps8640_write_bytes(client2, rom_page_id_buf, 3);
> + if (ret)
> + goto error;
> + cpy_len = fw->size >= 256 + pos ? 256 : fw->size - pos;
> + buf[0] = 0;
> + memcpy(buf + 1, fw->data + pos, cpy_len);
> + ret = ps8640_write_bytes(client7, buf, cpy_len + 1);
> + if (ret)
> + goto error;
> +
> + pos += cpy_len;
> +
> + dev_dbg(dev, "fw update completed %u / %zu bytes\n", pos,
> + fw->size);
> + }
> + return 0;
> +
> +error:
> + dev_err(dev, "failed write extenal flash, %d\n", ret);
> + return ret;
> +}
> +
> +static int ps8640_spi_normal_mode(struct ps8640 *ps_bridge)
> +{
> + u8 cmd[2];
> + struct i2c_client *client = ps_bridge->page[2];
> +
> + /* Enable-Write-Status-Register */
> + cmd[0] = WRITE_ENABLE_CMD;
> + ps8640_spi_send_cmd(ps_bridge, cmd, 1);
> +
> + /* protect BPL/BP0/BP1 */
> + cmd[0] = WRITE_STATUS_REG_CMD;
> + cmd[1] = BLK_PROTECT_BITS | STATUS_REG_PROTECT;
> + ps8640_spi_send_cmd(ps_bridge, cmd, 2);
> +
> + /* wait for SPI rom ready */
> + ps8640_wait_rom_idle(ps_bridge);
> +
> + /* disable PS8640 mapping function */
> + ps8640_write_byte(client, PAGE2_ENCTLSPI_WR, 0x00);
> +
> + gpiod_set_value(ps_bridge->gpio_mode_sel_n, 1);
> + return 0;
> +}
> +
> +static int ps8640_enter_bl(struct ps8640 *ps_bridge)
> +{
> + ps_bridge->in_fw_update = true;
> + return ps8640_spi_dl_mode(ps_bridge);
> +}
> +
> +static void ps8640_exit_bl(struct ps8640 *ps_bridge, const struct firmware *fw)
> +{
> + ps8640_spi_normal_mode(ps_bridge);
> + ps_bridge->in_fw_update = false;
> +}
> +
> +static int ps8640_load_fw(struct ps8640 *ps_bridge, const struct firmware *fw)
> +{
> + struct i2c_client *client = ps_bridge->page[0];
> + struct device *dev = &client->dev;
> + int ret;
> + bool ps8640_status_backup = ps_bridge->enabled;
> +
> + if (!ps_bridge->in_fw_update) {
> + if (!ps8640_status_backup)
> + ps8640_pre_enable(&ps_bridge->bridge);
> +
> + ret = ps8640_enter_bl(ps_bridge);
> + if (ret)
> + goto exit;
> + }
> +
> + ret = ps8640_validate_firmware(ps_bridge, fw);
ps8640_validate_firmware() does not depend on the device at all; do this check
before switching to "bootloader" mode.
> + if (ret)
> + goto exit;
> +
> + ret = ps8640_rom_prepare(ps_bridge);
> + if (ret)
> + goto exit;
> +
> + ret = ps8640_write_rom(ps_bridge, fw);
> +
> +exit:
> + if (ret)
> + dev_err(dev, "Failed to load firmware, %d\n", ret);
> +
> + ps8640_exit_bl(ps_bridge, fw);
> + if (!ps8640_status_backup)
> + ps8640_post_disable(&ps_bridge->bridge);
> + return ret;
> +}
> +
> +static ssize_t ps8640_update_fw_store(struct device *dev,
> + struct device_attribute *attr,
> + const char *buf, size_t count)
> +{
> + struct i2c_client *client = to_i2c_client(dev);
> + struct ps8640 *ps_bridge = i2c_get_clientdata(client);
> + const struct firmware *fw;
> + int error;
> +
> + error = request_firmware(&fw, PS_FW_NAME, dev);
> + if (error) {
> + dev_err(dev, "Unable to open firmware %s: %d\n",
> + PS_FW_NAME, error);
> + return error;
> + }
> +
> + error = ps8640_load_fw(ps_bridge, fw);
> + if (error)
> + dev_err(dev, "The firmware update failed(%d)\n", error);
> + else
> + dev_info(dev, "The firmware update succeeded\n");
> +
> + release_firmware(fw);
> + return error ? error : count;
> +}
> +
> +static DEVICE_ATTR(fw_version, S_IRUGO, ps8640_fw_version_show, NULL);
> +static DEVICE_ATTR(hw_version, S_IRUGO, ps8640_hw_version_show, NULL);
> +static DEVICE_ATTR(update_fw, S_IWUSR, NULL, ps8640_update_fw_store);
> +
> +static struct attribute *ps8640_attrs[] = {
> + &dev_attr_fw_version.attr,
> + &dev_attr_hw_version.attr,
> + &dev_attr_update_fw.attr,
> + NULL
> +};
> +
> +static const struct attribute_group ps8640_attr_group = {
> + .attrs = ps8640_attrs,
> +};
> +
> +static void ps8640_remove_sysfs_group(void *data)
> +{
> + struct ps8640 *ps_bridge = data;
> +
> + sysfs_remove_group(&ps_bridge->page[0]->dev.kobj, &ps8640_attr_group);
> +}
> +
> +static int ps8640_probe(struct i2c_client *client,
> + const struct i2c_device_id *id)
> +{
> + struct device *dev = &client->dev;
> + struct ps8640 *ps_bridge;
> + struct device_node *np = dev->of_node;
> + struct device_node *port, *out_ep;
> + struct device_node *panel_node = NULL;
> + int i, ret;
> +
> + ps_bridge = devm_kzalloc(dev, sizeof(*ps_bridge), GFP_KERNEL);
> + if (!ps_bridge)
> + return -ENOMEM;
> +
> + /* port at 1 is ps8640 output port */
> + port = of_graph_get_port_by_id(np, 1);
> + if (port) {
> + out_ep = of_get_child_by_name(port, "endpoint");
> + of_node_put(port);
> + if (out_ep) {
> + panel_node = of_graph_get_remote_port_parent(out_ep);
> + of_node_put(out_ep);
> + }
> + }
> + if (panel_node) {
> + ps_bridge->panel = of_drm_find_panel(panel_node);
> + of_node_put(panel_node);
> + if (!ps_bridge->panel)
> + return -EPROBE_DEFER;
> + }
> +
> + ps_bridge->supplies[0].supply = "vdd33";
> + ps_bridge->supplies[1].supply = "vdd12";
> + ret = devm_regulator_bulk_get(dev, ARRAY_SIZE(ps_bridge->supplies),
> + ps_bridge->supplies);
> + if (ret) {
> + dev_info(dev, "failed to get regulators: %d\n", ret);
> + return -EPROBE_DEFER;
return ret
> + }
> +
> + ps_bridge->gpio_mode_sel_n = devm_gpiod_get(&client->dev, "mode-sel",
> + GPIOD_OUT_HIGH);
> + if (IS_ERR(ps_bridge->gpio_mode_sel_n)) {
> + ret = PTR_ERR(ps_bridge->gpio_mode_sel_n);
> + dev_err(dev, "cannot get mode-sel %d\n", ret);
> + return ret;
> + }
> +
> + ps_bridge->gpio_slp_n = devm_gpiod_get(&client->dev, "sleep",
> + GPIOD_OUT_LOW);
> + if (IS_ERR(ps_bridge->gpio_slp_n)) {
> + ret = PTR_ERR(ps_bridge->gpio_slp_n);
> + dev_err(dev, "cannot get sleep: %d\n", ret);
> + return ret;
> + }
> +
> + /*
> + * Request the reset pin low to avoid the bridge being
> + * initialized prematurely
> + */
> + ps_bridge->gpio_rst_n = devm_gpiod_get(&client->dev, "reset",
> + GPIOD_OUT_LOW);
> + if (IS_ERR(ps_bridge->gpio_rst_n)) {
> + ret = PTR_ERR(ps_bridge->gpio_rst_n);
> + dev_err(dev, "cannot get reset: %d\n", ret);
> + return ret;
> + }
> +
> + ps_bridge->bridge.funcs = &ps8640_bridge_funcs;
> + ps_bridge->bridge.of_node = dev->of_node;
> + ret = drm_bridge_add(&ps_bridge->bridge);
> + if (ret) {
> + dev_err(dev, "Failed to add bridge: %d\n", ret);
> + return ret;
> + }
> +
> + ps_bridge->page[0] = client;
> + ps_bridge->ddc_i2c = i2c_new_dummy(client->adapter, EDID_I2C_ADDR);
> + if (!ps_bridge->ddc_i2c) {
> + dev_err(dev, "failed ddc_i2c dummy device, address%02x\n",
> + EDID_I2C_ADDR);
> + ret = -EBUSY;
> + goto exit_ddc_i2c_dummy;
> + }
> + /*
> + * ps8640 uses multiple addresses, use dummy devices for them
> + * page[0]: for DP control
> + * page[1]: for VIDEO Bridge
> + * page[2]: for control top
> + * page[3]: for DSI Link Control1
> + * page[4]: for MIPI Phy
> + * page[5]: for VPLL
> + * page[6]: for DSI Link Control2
> + * page[7]: for spi rom mapping
> + */
> + for (i = 1; i < 8; i++) {
> + ps_bridge->page[i] = i2c_new_dummy(client->adapter,
> + client->addr + i);
> + if (!ps_bridge->page[i]) {
> + dev_err(dev, "failed i2c dummy device, address%02x\n",
> + client->addr + i);
> + ret = -EBUSY;
> + goto exit_dummy;
> + }
> + }
> + i2c_set_clientdata(client, ps_bridge);
> +
> + ret = sysfs_create_group(&client->dev.kobj, &ps8640_attr_group);
> + if (ret) {
> + dev_err(dev, "failed to create sysfs entries: %d\n", ret);
> + goto exit_dummy;
> + }
> +
> + ret = devm_add_action(dev, ps8640_remove_sysfs_group, ps_bridge);
> + if (ret) {
> + dev_err(dev, "failed to add sysfs cleanup action: %d\n", ret);
> + goto exit_remove_sysfs;
> + }
> + return 0;
> +
> +exit_remove_sysfs:
> + sysfs_remove_group(&ps_bridge->page[0]->dev.kobj, &ps8640_attr_group);
> +exit_dummy:
> + for (i = 1; i < 8; i++)
> + if (ps_bridge->page[i])
> + i2c_unregister_device(ps_bridge->page[i]);
i2c_unregister_device(ps_bridge->ddc_i2c);
> +exit_ddc_i2c_dummy:
> + drm_bridge_remove(&ps_bridge->bridge);
> + return ret;
> +}
> +
> +static int ps8640_remove(struct i2c_client *client)
> +{
> + struct ps8640 *ps_bridge = i2c_get_clientdata(client);
> + int i;
> +
> + for (i = 1; i < 8; i++)
> + i2c_unregister_device(ps_bridge->page[i]);
i2c_unregister_device(ps_bridge->ddc_i2c);
Ok, that's it for this round.
Thanks!
-Dan
> +
> + drm_bridge_remove(&ps_bridge->bridge);
> +
> + return 0;
> +}
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