linux-kernel - Re: [PATCH 4/5] ASoC: codecs: Add WCD939x Soundwire slave driver

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Date:   Tue, 28 Nov 2023 10:16:35 +0100
From:   Neil Armstrong <neil.armstrong@...aro.org>
To:     Konrad Dybcio <konrad.dybcio@...aro.org>,
        Srinivas Kandagatla <srinivas.kandagatla@...aro.org>,
        Banajit Goswami <bgoswami@...cinc.com>,
        Andy Gross <agross@...nel.org>,
        Bjorn Andersson <andersson@...nel.org>,
        Liam Girdwood <lgirdwood@...il.com>,
        Mark Brown <broonie@...nel.org>,
        Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Conor Dooley <conor+dt@...nel.org>,
        Jaroslav Kysela <perex@...ex.cz>, Takashi Iwai <tiwai@...e.com>
Cc:     linux-arm-msm@...r.kernel.org, alsa-devel@...a-project.org,
        linux-sound@...r.kernel.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH 4/5] ASoC: codecs: Add WCD939x Soundwire slave driver

On 25/11/2023 12:55, Konrad Dybcio wrote:
> On 23.11.2023 15:49, Neil Armstrong wrote:
>> Add Soundwire Slave driver for the WCD9390/WCD9395 Audio Codec.
>>
>> The WCD9390/WCD9395 Soundwire Slaves will be used by the
>> main WCD9390/WCD9395 Audio Codec driver to access registers
>> and configure Soundwire RX and TX ports.
>>
>> Signed-off-by: Neil Armstrong <neil.armstrong@...aro.org>
>> ---
> [...]
> 
> 
>> +static struct wcd939x_sdw_ch_info wcd939x_sdw_tx_ch_info[] = {
>> +	WCD_SDW_CH(WCD939X_ADC1, WCD939X_ADC_1_4_PORT, BIT(0)),
>> +	WCD_SDW_CH(WCD939X_ADC2, WCD939X_ADC_1_4_PORT, BIT(1)),
>> +	WCD_SDW_CH(WCD939X_ADC3, WCD939X_ADC_1_4_PORT, BIT(2)),
>> +	WCD_SDW_CH(WCD939X_ADC4, WCD939X_ADC_1_4_PORT, BIT(3)),
>> +	// TOFIX support ADC3/4 & DMIC0/1 on port 2
> Well, fix it or drop it :D
> 
>> +	//WCD_SDW_CH(WCD939X_ADC3, WCD939X_ADC_DMIC_1_2_PORT, BIT(0)),
>> +	//WCD_SDW_CH(WCD939X_ADC4, WCD939X_ADC_DMIC_1_2_PORT, BIT(1)),
>> +	//WCD_SDW_CH(WCD939X_DMIC0, WCD939X_ADC_DMIC_1_2_PORT, BIT(2)),
>> +	//WCD_SDW_CH(WCD939X_DMIC1, WCD939X_ADC_DMIC_1_2_PORT, BIT(3)),
>> +	WCD_SDW_CH(WCD939X_DMIC0, WCD939X_DMIC_0_3_MBHC_PORT, BIT(0)),
>> +	WCD_SDW_CH(WCD939X_DMIC1, WCD939X_DMIC_0_3_MBHC_PORT, BIT(1)),
>> +	WCD_SDW_CH(WCD939X_MBHC, WCD939X_DMIC_0_3_MBHC_PORT, BIT(2)),
>> +	WCD_SDW_CH(WCD939X_DMIC2, WCD939X_DMIC_0_3_MBHC_PORT, BIT(2)),
>> +	WCD_SDW_CH(WCD939X_DMIC3, WCD939X_DMIC_0_3_MBHC_PORT, BIT(3)),
>> +	WCD_SDW_CH(WCD939X_DMIC4, WCD939X_DMIC_3_7_PORT, BIT(0)),
>> +	WCD_SDW_CH(WCD939X_DMIC5, WCD939X_DMIC_3_7_PORT, BIT(1)),
>> +	WCD_SDW_CH(WCD939X_DMIC6, WCD939X_DMIC_3_7_PORT, BIT(2)),
>> +	WCD_SDW_CH(WCD939X_DMIC7, WCD939X_DMIC_3_7_PORT, BIT(3)),
>> +};
> [...]
> 
>> +
>> +int wcd939x_swr_get_current_bank(struct sdw_slave *sdev)
>> +{
>> +	int bank;
>> +
>> +	bank = sdw_read(sdev, SDW_SCP_CTRL);
>> +
>> +	return ((bank & 0x40) ? 1 : 0);
> bool conversion?
> 
> Also, 0x40 == BIT(6), can you look up what it means and #define it?
Ack

> 
> [...]
> 
>> +
>> +static int wcd9390_bus_config(struct sdw_slave *slave,
>> +			      struct sdw_bus_params *params)
>> +{
>> +	sdw_write(slave, SWRS_SCP_HOST_CLK_DIV2_CTL_BANK(params->next_bank),
>> +		  0x01);
> similar, BIT(0)
Ack

> [...]
> 
>> +	{ WCD939X_EAR_STATUS_REG_2, 0x08 },
>> +	{ WCD939X_FLYBACK_NEW_CTRL_2, 0x00 }, //??
>> +	{ WCD939X_FLYBACK_NEW_CTRL_3, 0x00 }, //??
>> +	{ WCD939X_FLYBACK_NEW_CTRL_4, 0x44 }, //??
> drop //s

Ack

> [...]
> 
>> +static bool wcd939x_volatile_register(struct device *dev, unsigned int reg)
>> +{
>> +	if (reg <= WCD939X_BASE)
>> +		return false;
> Maybe move this check to readonly_register
>> +
>> +	if (wcd939x_readonly_register(dev, reg))
>> +		return true;
> and call readonly for .volatile_reg as well?
> [...]

Hmm, let me check

> 
>> +	/**
>> +	 * Port map index starts with 0, however the data port for this codec
>> +	 * are from index 1
>> +	 */
> This is not kerneldoc

Ack

> 
>> +	if (of_property_read_bool(dev->of_node, "qcom,tx-port-mapping")) {
>> +		wcd->is_tx = true;
>> +		ret = of_property_read_u32_array(dev->of_node,
>> +						 "qcom,tx-port-mapping",
>> +						 &pdev->m_port_map[1],
>> +						 WCD939X_MAX_TX_SWR_PORTS);
>> +	} else {
>> +		ret = of_property_read_u32_array(dev->of_node,
>> +						 "qcom,rx-port-mapping",
>> +						 &pdev->m_port_map[1],
>> +						 WCD939X_MAX_RX_SWR_PORTS);
>> +	}
> This is used in wcd9380 and will be used in wcd9370 when that happens some
> day, maybe it'd be worth to commonize it as qcom_{rx/tx}_portmap_get?
> [...]

OK but where ?

> 
>> +static const struct sdw_device_id wcd9390_slave_id[] = {
>> +	SDW_SLAVE_ENTRY(0x0217, 0x10e, 0),
> 0x10e - WCD9380 or 9385 slave? an inline comment at the end of the line
> would be cool!

Ack

> 
> Konrad