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[media] adv7604: Add support for hardware reset
The part can be reset by a low pulse on the RESET pin (i.e. a hardware reset) with a minimum width of 5 ms. It is recommended to wait 5 ms after the low pulse before an I2C write is performed to the part. For safety reasons, the delays will be between 5 and 10 ms. The RESET pin can be tied high, so the GPIO is optional. Signed-off-by: Dragos Bogdan <dragos.bogdan@analog.com> Reviewed-by: Lars-Peter Clausen <lars@metafoo.de> Acked-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com> Signed-off-by: Hans Verkuil <hans.verkuil@cisco.com> Signed-off-by: Mauro Carvalho Chehab <mchehab@s-opensource.com>
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@ -164,6 +164,7 @@ struct adv76xx_state {
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struct adv76xx_platform_data pdata;
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struct gpio_desc *hpd_gpio[4];
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struct gpio_desc *reset_gpio;
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struct v4l2_subdev sd;
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struct media_pad pads[ADV76XX_PAD_MAX];
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@ -3018,6 +3019,19 @@ static int configure_regmaps(struct adv76xx_state *state)
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return 0;
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}
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static void adv76xx_reset(struct adv76xx_state *state)
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{
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if (state->reset_gpio) {
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/* ADV76XX can be reset by a low reset pulse of minimum 5 ms. */
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gpiod_set_value_cansleep(state->reset_gpio, 0);
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usleep_range(5000, 10000);
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gpiod_set_value_cansleep(state->reset_gpio, 1);
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/* It is recommended to wait 5 ms after the low pulse before */
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/* an I2C write is performed to the ADV76XX. */
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usleep_range(5000, 10000);
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}
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}
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static int adv76xx_probe(struct i2c_client *client,
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const struct i2c_device_id *id)
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{
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@ -3081,6 +3095,12 @@ static int adv76xx_probe(struct i2c_client *client,
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if (state->hpd_gpio[i])
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v4l_info(client, "Handling HPD %u GPIO\n", i);
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}
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state->reset_gpio = devm_gpiod_get_optional(&client->dev, "reset",
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GPIOD_OUT_HIGH);
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if (IS_ERR(state->reset_gpio))
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return PTR_ERR(state->reset_gpio);
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adv76xx_reset(state);
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state->timings = cea640x480;
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state->format = adv76xx_format_info(state, MEDIA_BUS_FMT_YUYV8_2X8);
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