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

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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@xxxxxxxxxx>
---
[...]


+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





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