Re: [PATCH 1/2] media: i2c: adv748x: Convert SW reset routine to function

[Kieran Bingham <kieran.bingham+renesas@ideasonboard.com>]

Hi Hans,

On 18/01/2019 12:09, Hans Verkuil wrote:
> On 1/11/19 6:41 PM, Kieran Bingham wrote:
>> The ADV748x is currently reset by writting a small table of registers to
>> the device.

s/writting/writing/

>>
>> The table lacks documentation and contains magic values to perform the
>> actions, including using a fake register address to introduce a delay
>> loop.
>>
>> Remove the table, and convert to code, documenting the purpose of the
>> specific writes along the way.
>>
>> Signed-off-by: Kieran Bingham <kieran.bingham+renesas@ideasonboard.com>
> 
> Hmm, this patch doesn't apply to the master branch.
> 
> Does it depend on other patches being merged first, or it is just out-of-date?


Hi Hans,

Sorry - I should have specified - They are dependant upon Jacopo's series.

--
Kieran

> 
> Regards,
> 
> 	Hans
> 
>> ---
>>  drivers/media/i2c/adv748x/adv748x-core.c | 32 ++++++++++++++++--------
>>  drivers/media/i2c/adv748x/adv748x.h      | 16 ++++++++++++
>>  2 files changed, 38 insertions(+), 10 deletions(-)
>>
>> diff --git a/drivers/media/i2c/adv748x/adv748x-core.c b/drivers/media/i2c/adv748x/adv748x-core.c
>> index 02f9c440301c..252bdb28b18b 100644
>> --- a/drivers/media/i2c/adv748x/adv748x-core.c
>> +++ b/drivers/media/i2c/adv748x/adv748x-core.c
>> @@ -389,15 +389,6 @@ static const struct media_entity_operations adv748x_media_ops = {
>>   * HW setup
>>   */
>>  
>> -static const struct adv748x_reg_value adv748x_sw_reset[] = {
>> -
>> -	{ADV748X_PAGE_IO, 0xff, 0xff},	/* SW reset */
>> -	{ADV748X_PAGE_WAIT, 0x00, 0x05},/* delay 5 */
>> -	{ADV748X_PAGE_IO, 0x01, 0x76},	/* ADI Required Write */
>> -	{ADV748X_PAGE_IO, 0xf2, 0x01},	/* Enable I2C Read Auto-Increment */
>> -	{ADV748X_PAGE_EOR, 0xff, 0xff}	/* End of register table */
>> -};
>> -
>>  /* Initialize CP Core with RGB888 format. */
>>  static const struct adv748x_reg_value adv748x_init_hdmi[] = {
>>  	/* Disable chip powerdown & Enable HDMI Rx block */
>> @@ -474,12 +465,33 @@ static const struct adv748x_reg_value adv748x_init_afe[] = {
>>  	{ADV748X_PAGE_EOR, 0xff, 0xff}	/* End of register table */
>>  };
>>  
>> +static int adv748x_sw_reset(struct adv748x_state *state)
>> +{
>> +	int ret;
>> +
>> +	ret = io_write(state, ADV748X_IO_REG_FF, ADV748X_IO_REG_FF_MAIN_RESET);
>> +	if (ret)
>> +		return ret;
>> +
>> +	usleep_range(5000, 6000);
>> +
>> +	/* Disable CEC Wakeup from power-down mode */
>> +	ret = io_clrset(state, ADV748X_IO_REG_01, ADV748X_IO_REG_01_PWRDN_MASK,
>> +			ADV748X_IO_REG_01_PWRDNB);
>> +	if (ret)
>> +		return ret;
>> +
>> +	/* Enable I2C Read Auto-Increment for consecutive reads */
>> +	return io_write(state, ADV748X_IO_REG_F2,
>> +			ADV748X_IO_REG_F2_READ_AUTO_INC);
>> +}
>> +
>>  static int adv748x_reset(struct adv748x_state *state)
>>  {
>>  	int ret;
>>  	u8 regval = 0;
>>  
>> -	ret = adv748x_write_regs(state, adv748x_sw_reset);
>> +	ret = adv748x_sw_reset(state);
>>  	if (ret < 0)
>>  		return ret;
>>  
>> diff --git a/drivers/media/i2c/adv748x/adv748x.h b/drivers/media/i2c/adv748x/adv748x.h
>> index b00c1995efb0..2f8d751cfbb0 100644
>> --- a/drivers/media/i2c/adv748x/adv748x.h
>> +++ b/drivers/media/i2c/adv748x/adv748x.h
>> @@ -211,6 +211,11 @@ struct adv748x_state {
>>  #define ADV748X_IO_PD			0x00	/* power down controls */
>>  #define ADV748X_IO_PD_RX_EN		BIT(6)
>>  
>> +#define ADV748X_IO_REG_01		0x01	/* pwrdn{2}b, prog_xtal_freq */
>> +#define ADV748X_IO_REG_01_PWRDN_MASK	(BIT(7) | BIT(6))
>> +#define ADV748X_IO_REG_01_PWRDN2B	BIT(7)	/* CEC Wakeup Support */
>> +#define ADV748X_IO_REG_01_PWRDNB	BIT(6)	/* CEC Wakeup Support */
>> +
>>  #define ADV748X_IO_REG_04		0x04
>>  #define ADV748X_IO_REG_04_FORCE_FR	BIT(0)	/* Force CP free-run */
>>  
>> @@ -229,8 +234,19 @@ struct adv748x_state {
>>  #define ADV748X_IO_CHIP_REV_ID_1	0xdf
>>  #define ADV748X_IO_CHIP_REV_ID_2	0xe0
>>  
>> +#define ADV748X_IO_REG_F2		0xf2
>> +#define ADV748X_IO_REG_F2_READ_AUTO_INC	BIT(0)
>> +
>> +/* For PAGE slave address offsets */
>>  #define ADV748X_IO_SLAVE_ADDR_BASE	0xf2
>>  
>> +/*
>> + * The ADV748x_Recommended_Settings_PrA_2014-08-20.pdf details both 0x80 and
>> + * 0xff as examples for performing a software reset.
>> + */
>> +#define ADV748X_IO_REG_FF		0xff
>> +#define ADV748X_IO_REG_FF_MAIN_RESET	0xff
>> +
>>  /* HDMI RX Map */
>>  #define ADV748X_HDMI_LW1		0x07	/* line width_1 */
>>  #define ADV748X_HDMI_LW1_VERT_FILTER	BIT(7)
>>
>