Re: [PATCH 1/3 v2] drm/i2c/adv7511: Add audio support

[Jose Abreu <Jose.Abreu@synopsys.com>]

Hi Laurent,


On 01-04-2016 18:10, Laurent Pinchart wrote:
> Hi Jose,
>
> Thank you for the patch.
>
> On Monday 28 Mar 2016 15:36:09 Jose Abreu wrote:
>> This patch adds audio support for the ADV7511 HDMI transmitter
>> using ALSA SoC.
>>
>> The code was ported from Analog Devices linux tree from
>> commit 1770c4a1e32b ("Merge remote-tracking branch
>> 'xilinx/master' into xcomm_zynq"), which is available at:
>> 	- https://github.com/analogdevicesinc/linux/
>>
>> The main core file was renamed from adv7511.c to adv7511_core.c
>> so that audio and video compile into a single adv7511.ko module
>> and to keep up with Analog Devices kernel tree.
>>
>> The audio can be disabled using menu-config so it is possible
>> to use only video mode.
>>
>> The HDMI mode is automatically started at boot and the audio
>> (when enabled) registers as a codec into ALSA.
>>
>> SPDIF DAI format was also added to ASoC as it is required
>> by adv7511 audio.
>>
>> Signed-off-by: Jose Abreu <joabreu@synopsys.com>
>> ---
>>
>> No changes v1 -> v2.
>>
>>  drivers/gpu/drm/i2c/Kconfig         |   11 +
>>  drivers/gpu/drm/i2c/Makefile        |    2 +
>>  drivers/gpu/drm/i2c/adv7511.c       | 1024 -------------------------------
>>  drivers/gpu/drm/i2c/adv7511.h       |   41 ++
>>  drivers/gpu/drm/i2c/adv7511_audio.c |  310 +++++++++++
>>  drivers/gpu/drm/i2c/adv7511_core.c  | 1005 ++++++++++++++++++++++++++++++
> Please use git-format-patch -M to detect renames if you send a new version of 
> this series, it will help with review.

Ok, will do that in next version.

>>  include/sound/soc-dai.h             |    1 +
>>  7 files changed, 1370 insertions(+), 1024 deletions(-)
>>  delete mode 100644 drivers/gpu/drm/i2c/adv7511.c
>>  create mode 100644 drivers/gpu/drm/i2c/adv7511_audio.c
>>  create mode 100644 drivers/gpu/drm/i2c/adv7511_core.c
> [snip]
>
>> diff --git a/drivers/gpu/drm/i2c/adv7511_core.c
>> b/drivers/gpu/drm/i2c/adv7511_core.c new file mode 100644
>> index 0000000..d54256a
>> --- /dev/null
>> +++ b/drivers/gpu/drm/i2c/adv7511_core.c
> [snip]
>
>> +static int adv7511_probe(struct i2c_client *i2c, const struct i2c_device_id
>> *id) +{
>> +	struct adv7511_link_config link_config;
>> +	struct adv7511 *adv7511;
>> +	struct device *dev = &i2c->dev;
>> +	unsigned int val;
>> +	int ret;
>> +
>> +	if (!dev->of_node)
>> +		return -EINVAL;
>> +
>> +	adv7511 = devm_kzalloc(dev, sizeof(*adv7511), GFP_KERNEL);
>> +	if (!adv7511)
>> +		return -ENOMEM;
>> +
>> +	adv7511->powered = false;
>> +	adv7511->status = connector_status_disconnected;
>> +
>> +	ret = adv7511_parse_dt(dev->of_node, &link_config);
>> +	if (ret)
>> +		return ret;
>> +
>> +	/*
>> +	 * The power down GPIO is optional. If present, toggle it from active to
>> +	 * inactive to wake up the encoder.
>> +	 */
>> +	adv7511->gpio_pd = devm_gpiod_get_optional(dev, "pd", GPIOD_OUT_HIGH);
>> +	if (IS_ERR(adv7511->gpio_pd))
>> +		return PTR_ERR(adv7511->gpio_pd);
>> +
>> +	if (adv7511->gpio_pd) {
>> +		mdelay(5);
>> +		gpiod_set_value_cansleep(adv7511->gpio_pd, 0);
>> +	}
>> +
>> +	adv7511->regmap = devm_regmap_init_i2c(i2c, &adv7511_regmap_config);
>> +	if (IS_ERR(adv7511->regmap))
>> +		return PTR_ERR(adv7511->regmap);
>> +
>> +	ret = regmap_read(adv7511->regmap, ADV7511_REG_CHIP_REVISION, &val);
>> +	if (ret)
>> +		return ret;
>> +	dev_dbg(dev, "Rev. %d\n", val);
>> +
>> +	ret = regmap_register_patch(adv7511->regmap, adv7511_fixed_registers,
>> +				    ARRAY_SIZE(adv7511_fixed_registers));
>> +	if (ret)
>> +		return ret;
>> +
>> +	regmap_write(adv7511->regmap, ADV7511_REG_EDID_I2C_ADDR, edid_i2c_addr);
>> +	regmap_write(adv7511->regmap, ADV7511_REG_PACKET_I2C_ADDR,
>> +		     packet_i2c_addr);
>> +	regmap_write(adv7511->regmap, ADV7511_REG_CEC_I2C_ADDR, cec_i2c_addr);
>> +	adv7511_packet_disable(adv7511, 0xffff);
>> +
>> +	adv7511->i2c_main = i2c;
>> +	adv7511->i2c_edid = i2c_new_dummy(i2c->adapter, edid_i2c_addr >> 1);
>> +	if (!adv7511->i2c_edid)
>> +		return -ENOMEM;
>> +
>> +	if (i2c->irq) {
>> +		init_waitqueue_head(&adv7511->wq);
>> +
>> +		ret = devm_request_threaded_irq(dev, i2c->irq, NULL,
>> +						adv7511_irq_handler,
>> +						IRQF_ONESHOT, dev_name(dev),
>> +						adv7511);
>> +		if (ret)
>> +			goto err_i2c_unregister_device;
>> +	}
>> +
>> +	/* CEC is unused for now */
>> +	regmap_write(adv7511->regmap, ADV7511_REG_CEC_CTRL,
>> +		     ADV7511_CEC_CTRL_POWER_DOWN);
>> +
>> +	adv7511_power_off(adv7511);
>> +
>> +	i2c_set_clientdata(i2c, adv7511);
>> +
>> +#ifdef CONFIG_DRM_I2C_ADV7511_AUDIO
>> +	adv7511_audio_init(&i2c->dev);
>> +#endif
> Shouldn't we condition this to the audio channel being somehow described in DT 
> ? If a board doesn't route audio signals to the ADV7511 audio input, there's 
> no need to register an audio codec.

I can do this but the audio is already conditionally compiled using menuconfig.
Is it really necessary to add this extra layer of condition?

>> +
>> +	adv7511_set_link_config(adv7511, &link_config);
>> +
>> +	/* Enable HDMI mode */
>> +	regmap_update_bits(adv7511->regmap, ADV7511_REG_HDCP_HDMI_CFG,
>> +			ADV7511_HDMI_CFG_MODE_MASK,
>> +			ADV7511_HDMI_CFG_MODE_HDMI);
>> +
>> +	return 0;
>> +
>> +err_i2c_unregister_device:
>> +	i2c_unregister_device(adv7511->i2c_edid);
>> +
>> +	return ret;
>> +}

Best regards,
Jose Miguel Abreu