linux-kernel - Re: [alsa-devel] [RFC PATCH 02/40] soundwire: cadence

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Message-ID: <37002145-b8dc-ac30-d857-00b277ef4bac@linux.intel.com>
Date:   Mon, 5 Aug 2019 10:20:25 -0500
From:   Pierre-Louis Bossart <pierre-louis.bossart@...ux.intel.com>
To:     Sanyog Kale <sanyog.r.kale@...el.com>
Cc:     alsa-devel@...a-project.org, linux-kernel@...r.kernel.org,
        tiwai@...e.de, broonie@...nel.org, vkoul@...nel.org,
        gregkh@...uxfoundation.org, jank@...ence.com,
        srinivas.kandagatla@...aro.org, slawomir.blauciak@...el.com
Subject: Re: [alsa-devel] [RFC PATCH 02/40] soundwire: cadence_master: add
 debugfs register dump


>> +static ssize_t cdns_reg_read(struct file *file, char __user *user_buf,
>> +			     size_t count, loff_t *ppos)
>> +{
>> +	struct sdw_cdns *cdns = file->private_data;
>> +	char *buf;
>> +	ssize_t ret;
>> +	int i, j;
>> +
>> +	buf = kzalloc(RD_BUF, GFP_KERNEL);
>> +	if (!buf)
>> +		return -ENOMEM;
>> +
>> +	ret = scnprintf(buf, RD_BUF, "Register  Value\n");
>> +	ret += scnprintf(buf + ret, RD_BUF - ret, "\nMCP Registers\n");
>> +	for (i = 0; i < 8; i++) /* 8 MCP registers */
>> +		ret += cdns_sprintf(cdns, buf, ret, i * 4);
>> +
>> +	ret += scnprintf(buf + ret, RD_BUF - ret,
>> +			 "\nStatus & Intr Registers\n");
>> +	for (i = 0; i < 13; i++) /* 13 Status & Intr registers */
>> +		ret += cdns_sprintf(cdns, buf, ret, CDNS_MCP_STAT + i * 4);
>> +
>> +	ret += scnprintf(buf + ret, RD_BUF - ret,
>> +			 "\nSSP & Clk ctrl Registers\n");
>> +	ret += cdns_sprintf(cdns, buf, ret, CDNS_MCP_SSP_CTRL0);
>> +	ret += cdns_sprintf(cdns, buf, ret, CDNS_MCP_SSP_CTRL1);
>> +	ret += cdns_sprintf(cdns, buf, ret, CDNS_MCP_CLK_CTRL0);
>> +	ret += cdns_sprintf(cdns, buf, ret, CDNS_MCP_CLK_CTRL1);
>> +
>> +	ret += scnprintf(buf + ret, RD_BUF - ret,
>> +			 "\nDPn B0 Registers\n");
>> +	for (i = 0; i < 7; i++) {
>> +		ret += scnprintf(buf + ret, RD_BUF - ret,
>> +				 "\nDP-%d\n", i);
>> +		for (j = 0; j < 6; j++)
>> +			ret += cdns_sprintf(cdns, buf, ret,
>> +					CDNS_DPN_B0_CONFIG(i) + j * 4);
>> +	}
>> +
>> +	ret += scnprintf(buf + ret, RD_BUF - ret,
>> +			 "\nDPn B1 Registers\n");
>> +	for (i = 0; i < 7; i++) {
>> +		ret += scnprintf(buf + ret, RD_BUF - ret,
>> +				 "\nDP-%d\n", i);
>> +
>> +		for (j = 0; j < 6; j++)
>> +			ret += cdns_sprintf(cdns, buf, ret,
>> +					CDNS_DPN_B1_CONFIG(i) + j * 4);
>> +	}
>> +
>> +	ret += scnprintf(buf + ret, RD_BUF - ret,
>> +			 "\nDPn Control Registers\n");
>> +	for (i = 0; i < 7; i++)
>> +		ret += cdns_sprintf(cdns, buf, ret,
>> +				CDNS_PORTCTRL + i * CDNS_PORT_OFFSET);
>> +
>> +	ret += scnprintf(buf + ret, RD_BUF - ret,
>> +			 "\nPDIn Config Registers\n");
>> +	for (i = 0; i < 7; i++)
> 
> please use macros for all the hardcodings.

yes, I completely changed that part in the upcoming update by using 
register start/stop for all loops, it makes the code more consistent and 
easier to change (SoundWire 1.2 registers will need to be added)