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Commit f5591da9 authored by Dragos Bogdan's avatar Dragos Bogdan Committed by Mauro Carvalho Chehab
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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: default avatarDragos Bogdan <dragos.bogdan@analog.com>
Reviewed-by: default avatarLars-Peter Clausen <lars@metafoo.de>
Acked-by: default avatarLaurent Pinchart <laurent.pinchart@ideasonboard.com>
Signed-off-by: default avatarHans Verkuil <hans.verkuil@cisco.com>
Signed-off-by: default avatarMauro Carvalho Chehab <mchehab@s-opensource.com>
parent 20634fd1

drivers/media/i2c/adv7604.c

+20 −0
Original line number Diff line number Diff line
@@ -164,6 +164,7 @@ struct adv76xx_state { 
	struct adv76xx_platform_data pdata;



	struct gpio_desc *hpd_gpio[4];

	struct gpio_desc *reset_gpio;



	struct v4l2_subdev sd;

	struct media_pad pads[ADV76XX_PAD_MAX];
@@ -3018,6 +3019,19 @@ static int configure_regmaps(struct adv76xx_state *state) 
	return 0;

}



static void adv76xx_reset(struct adv76xx_state *state)

{

	if (state->reset_gpio) {

		/* ADV76XX can be reset by a low reset pulse of minimum 5 ms. */

		gpiod_set_value_cansleep(state->reset_gpio, 0);

		usleep_range(5000, 10000);

		gpiod_set_value_cansleep(state->reset_gpio, 1);

		/* It is recommended to wait 5 ms after the low pulse before */

		/* an I2C write is performed to the ADV76XX. */

		usleep_range(5000, 10000);

	}

}



static int adv76xx_probe(struct i2c_client *client,

			 const struct i2c_device_id *id)

{
@@ -3081,6 +3095,12 @@ static int adv76xx_probe(struct i2c_client *client, 
		if (state->hpd_gpio[i])

			v4l_info(client, "Handling HPD %u GPIO\n", i);

	}

	state->reset_gpio = devm_gpiod_get_optional(&client->dev, "reset",

								GPIOD_OUT_HIGH);

	if (IS_ERR(state->reset_gpio))

		return PTR_ERR(state->reset_gpio);



	adv76xx_reset(state);



	state->timings = cea640x480;

	state->format = adv76xx_format_info(state, MEDIA_BUS_FMT_YUYV8_2X8);