Claude review: drm/bridge: ite-it6263: Move chip initialization code from probe to atomic_enable

[Claude Code Review Bot <claude-review@example.com>]

Patch Review

**Adding `reset_gpio` to struct (line 203 of patched file):**
```c
struct gpio_desc *reset_gpio;
```
Straightforward. Needed to make the GPIO accessible beyond probe scope.

**Initialization block in `atomic_enable` (lines 607–614):**
```c
it6263_hw_reset(it->reset_gpio);

ret = it6263_lvds_set_i2c_addr(it);
if (ret)
    dev_err(it->dev, "failed to set I2C addr\n");

it6263_lvds_config(it);
it6263_hdmi_config(it);
```

- The `it6263_hw_reset()` call is fine here — it already handles a NULL `reset_gpio` gracefully.

- **Issue: Continuing after `it6263_lvds_set_i2c_addr` failure.** If this call fails, `it6263_lvds_config()` will write to the LVDS regmap, which uses the I2C address that was supposed to be configured by `it6263_lvds_set_i2c_addr()`. Looking at the code, the LVDS I2C device is created with `LVDS_INPUT_CTRL_I2C_ADDR` as a fixed address via `devm_i2c_new_dummy_device()` in probe, and `it6263_lvds_set_i2c_addr()` tells the *HDMI chip* to expose the LVDS sub-block at that address. So if this fails, subsequent LVDS regmap operations will be talking to an address where nothing is responding, and you'll get I2C errors. The function should `return` early here instead of continuing:

  ```c
  ret = it6263_lvds_set_i2c_addr(it);
  if (ret) {
      dev_err(it->dev, "failed to set I2C addr\n");
      return;
  }
  ```

**Removal from probe (lines 879–882 area of patched file):**
```c
-	it6263_hw_reset(reset_gpio);
-
-	ret = it6263_lvds_set_i2c_addr(it);
-	if (ret)
-		return dev_err_probe(dev, ret, "failed to set I2C addr\n");
```

The removal is clean. However, note that `it6263_parse_dt()` (called at line 880) does not access the chip hardware, and `devm_i2c_new_dummy_device()` at line 884 reserves the I2C address but doesn't communicate with the chip, so this ordering is fine.

```c
-	it6263_lvds_config(it);
-	it6263_hdmi_config(it);
```

Also cleanly removed.

**Summary:** The patch is fundamentally correct in its approach. The main actionable feedback is:

1. **Return early on `it6263_lvds_set_i2c_addr` failure in `atomic_enable`** rather than proceeding with LVDS/HDMI config that will fail.

2. **Verify that `it6263_detect()` works without `it6263_hdmi_config()`** having been called. The DDC master select (`MASTER_SEL_HOST`) is only written in `it6263_read_edid`, not in `it6263_hdmi_config`, so EDID reads may be fine. But `it6263_detect()` reads `HDMI_REG_SYS_STATUS` for HPD — confirm this register is readable in the chip's power-on-reset state without the soft-reset sequence from `it6263_hdmi_config()`.

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Generated by Claude Code Patch Reviewer