linux-kernel - Re: [PATCH v3 3/7] soundwire: qcom: allow 16-bit sample interval for ports

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Date:   Tue, 18 Apr 2023 11:08:24 +0100
From:   Srinivas Kandagatla <srinivas.kandagatla@...aro.org>
To:     Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>,
        Andy Gross <agross@...nel.org>,
        Bjorn Andersson <andersson@...nel.org>,
        Konrad Dybcio <konrad.dybcio@...aro.org>,
        Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Vinod Koul <vkoul@...nel.org>,
        Bard Liao <yung-chuan.liao@...ux.intel.com>,
        Pierre-Louis Bossart <pierre-louis.bossart@...ux.intel.com>,
        Sanyog Kale <sanyog.r.kale@...el.com>,
        Rao Mandadapu <quic_srivasam@...cinc.com>,
        linux-arm-msm@...r.kernel.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org, alsa-devel@...a-project.org
Subject: Re: [PATCH v3 3/7] soundwire: qcom: allow 16-bit sample interval for
 ports



On 18/04/2023 10:54, Krzysztof Kozlowski wrote:
> The port sample interval was always 16-bit, split into low and high
> bytes.  This split was unnecessary, although harmless for older devices
> because all of them used only lower byte (so values < 0xff).  With
> support for Soundwire controller on Qualcomm SM8550 and its devices,
> both bytes will be used, thus add a new 'qcom,ports-sinterval' property
> to allow 16-bit sample intervals.
> 
> Reviewed-by: Konrad Dybcio <konrad.dybcio@...aro.org>
> Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
> 
> ---
> 
LGTM,

Reviewed-by: Srinivas Kandagatla <srinivas.kandagatla@...aro.org>

--srini
> Changes since v2:
> 1. Use uint16 for qcom,ports-sinterval.
> 2. Add tags.
> 
> Changes since v1:
> 1. Drop unneeded semicolon.
> ---
>   drivers/soundwire/qcom.c | 32 +++++++++++++++++++++++++-------
>   1 file changed, 25 insertions(+), 7 deletions(-)
> 
> diff --git a/drivers/soundwire/qcom.c b/drivers/soundwire/qcom.c
> index c296e0bf897b..d051dc408532 100644
> --- a/drivers/soundwire/qcom.c
> +++ b/drivers/soundwire/qcom.c
> @@ -95,6 +95,7 @@
>   #define SWRM_DP_BLOCK_CTRL2_BANK(n, m)	(0x1130 + 0x100 * (n - 1) + 0x40 * m)
>   #define SWRM_DP_PORT_HCTRL_BANK(n, m)	(0x1134 + 0x100 * (n - 1) + 0x40 * m)
>   #define SWRM_DP_BLOCK_CTRL3_BANK(n, m)	(0x1138 + 0x100 * (n - 1) + 0x40 * m)
> +#define SWRM_DP_SAMPLECTRL2_BANK(n, m)	(0x113C + 0x100 * (n - 1) + 0x40 * m)
>   #define SWRM_DIN_DPn_PCM_PORT_CTRL(n)	(0x1054 + 0x100 * (n - 1))
>   #define SWR_MSTR_MAX_REG_ADDR		(0x1740)
>   
> @@ -131,7 +132,7 @@ enum {
>   };
>   
>   struct qcom_swrm_port_config {
> -	u8 si;
> +	u16 si;
>   	u8 off1;
>   	u8 off2;
>   	u8 bp_mode;
> @@ -806,12 +807,20 @@ static int qcom_swrm_transport_params(struct sdw_bus *bus,
>   
>   	value = pcfg->off1 << SWRM_DP_PORT_CTRL_OFFSET1_SHFT;
>   	value |= pcfg->off2 << SWRM_DP_PORT_CTRL_OFFSET2_SHFT;
> -	value |= pcfg->si;
> +	value |= pcfg->si & 0xff;
>   
>   	ret = ctrl->reg_write(ctrl, reg, value);
>   	if (ret)
>   		goto err;
>   
> +	if (pcfg->si > 0xff) {
> +		value = (pcfg->si >> 8) & 0xff;
> +		reg = SWRM_DP_SAMPLECTRL2_BANK(params->port_num, bank);
> +		ret = ctrl->reg_write(ctrl, reg, value);
> +		if (ret)
> +			goto err;
> +	}
> +
>   	if (pcfg->lane_control != SWR_INVALID_PARAM) {
>   		reg = SWRM_DP_PORT_CTRL_2_BANK(params->port_num, bank);
>   		value = pcfg->lane_control;
> @@ -1185,7 +1194,7 @@ static int qcom_swrm_get_port_config(struct qcom_swrm_ctrl *ctrl)
>   	struct device_node *np = ctrl->dev->of_node;
>   	u8 off1[QCOM_SDW_MAX_PORTS];
>   	u8 off2[QCOM_SDW_MAX_PORTS];
> -	u8 si[QCOM_SDW_MAX_PORTS];
> +	u16 si[QCOM_SDW_MAX_PORTS];
>   	u8 bp_mode[QCOM_SDW_MAX_PORTS] = { 0, };
>   	u8 hstart[QCOM_SDW_MAX_PORTS];
>   	u8 hstop[QCOM_SDW_MAX_PORTS];
> @@ -1193,6 +1202,7 @@ static int qcom_swrm_get_port_config(struct qcom_swrm_ctrl *ctrl)
>   	u8 blk_group_count[QCOM_SDW_MAX_PORTS];
>   	u8 lane_control[QCOM_SDW_MAX_PORTS];
>   	int i, ret, nports, val;
> +	bool si_16 = false;
>   
>   	ctrl->reg_read(ctrl, SWRM_COMP_PARAMS, &val);
>   
> @@ -1236,9 +1246,14 @@ static int qcom_swrm_get_port_config(struct qcom_swrm_ctrl *ctrl)
>   		return ret;
>   
>   	ret = of_property_read_u8_array(np, "qcom,ports-sinterval-low",
> -					si, nports);
> -	if (ret)
> -		return ret;
> +					(u8 *)si, nports);
> +	if (ret) {
> +		ret = of_property_read_u16_array(np, "qcom,ports-sinterval",
> +						 si, nports);
> +		if (ret)
> +			return ret;
> +		si_16 = true;
> +	}
>   
>   	ret = of_property_read_u8_array(np, "qcom,ports-block-pack-mode",
>   					bp_mode, nports);
> @@ -1266,7 +1281,10 @@ static int qcom_swrm_get_port_config(struct qcom_swrm_ctrl *ctrl)
>   
>   	for (i = 0; i < nports; i++) {
>   		/* Valid port number range is from 1-14 */
> -		ctrl->pconfig[i + 1].si = si[i];
> +		if (si_16)
> +			ctrl->pconfig[i + 1].si = si[i];
> +		else
> +			ctrl->pconfig[i + 1].si = ((u8 *)si)[i];
>   		ctrl->pconfig[i + 1].off1 = off1[i];
>   		ctrl->pconfig[i + 1].off2 = off2[i];
>   		ctrl->pconfig[i + 1].bp_mode = bp_mode[i];