diff options
author | Kieran Bingham <kieran.bingham+renesas@ideasonboard.com> | 2019-01-11 12:41:40 -0500 |
---|---|---|
committer | Mauro Carvalho Chehab <mchehab+samsung@kernel.org> | 2019-02-18 11:24:49 -0500 |
commit | ac105ab2138f43b7acbc91f17453e0a0ba2f7f33 (patch) | |
tree | f6319694bd7108fee4b620e977d982795c0000ec /drivers/media/i2c | |
parent | 9423ca350df71ff71f8db2b01127eecd2254f619 (diff) |
media: i2c: adv748x: Convert SW reset routine to function
The ADV748x is currently reset by writting a small table of registers to
the device.
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>
Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Reviewed-by: Niklas Söderlund <niklas.soderlund+renesas@ragnatech.se>
Signed-off-by: Hans Verkuil <hverkuil-cisco@xs4all.nl>
Signed-off-by: Mauro Carvalho Chehab <mchehab+samsung@kernel.org>
Diffstat (limited to 'drivers/media/i2c')
-rw-r--r-- | drivers/media/i2c/adv748x/adv748x-core.c | 32 | ||||
-rw-r--r-- | 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) |