linux-kernel - Re: [PATCH] mmc: core: Convert to use __mmc_poll_for_busy() SD_APP_OP

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Message-ID: <0062850816281e5720d88577cff2bfa9@manjaro.org>
Date: Tue, 30 Apr 2024 03:19:27 +0200
From: Dragan Simic <dsimic@...jaro.org>
To: Ulf Hansson <ulf.hansson@...aro.org>
Cc: linux-mmc@...r.kernel.org, Adrian Hunter <adrian.hunter@...el.com>, Avri
 Altman <avri.altman@....com>, Felix Qin <xiaokeqinhealth@....com>,
 linux-kernel@...r.kernel.org
Subject: Re: [PATCH] mmc: core: Convert to use __mmc_poll_for_busy()
 SD_APP_OP_COND too

On 2024-04-30 03:17, Dragan Simic wrote:
> Hello Ulf,
> 
> Please see my comment below.
> 
> On 2024-04-25 15:30, Ulf Hansson wrote:
>> Similar to what has already been changed for eMMC and the 
>> MMC_SEND_OP_COND
>> (CMD1), let's convert the SD_APP_OP_COND (ACMD41) for SD cards to use 
>> the
>> common __mmc_poll_for_busy() too.
>> 
>> This change means the initial delay period, that starts as 10ms will 
>> now
>> increase for every loop when being busy. The total accepted timeout 
>> for
>> being busy is 1s, which is according to the SD spec.
>> 
>> Signed-off-by: Ulf Hansson <ulf.hansson@...aro.org>
>> ---
>>  drivers/mmc/core/sd_ops.c | 77 
>> +++++++++++++++++++++++++--------------
>>  1 file changed, 50 insertions(+), 27 deletions(-)
>> 
>> diff --git a/drivers/mmc/core/sd_ops.c b/drivers/mmc/core/sd_ops.c
>> index a59cd592f06e..3ce1ff336826 100644
>> --- a/drivers/mmc/core/sd_ops.c
>> +++ b/drivers/mmc/core/sd_ops.c
>> @@ -19,6 +19,15 @@
>>  #include "sd_ops.h"
>>  #include "mmc_ops.h"
>> 
>> +#define SD_APP_OP_COND_PERIOD_US	(10 * 1000) /* 10ms */
>> +#define SD_APP_OP_COND_TIMEOUT_MS	1000 /* 1s */
>> +
>> +struct sd_app_op_cond_busy_data {
>> +	struct mmc_host *host;
>> +	u32 ocr;
>> +	struct mmc_command *cmd;
>> +};
>> +
>>  int mmc_app_cmd(struct mmc_host *host, struct mmc_card *card)
>>  {
>>  	int err;
>> @@ -115,10 +124,44 @@ int mmc_app_set_bus_width(struct mmc_card *card,
>> int width)
>>  	return mmc_wait_for_app_cmd(card->host, card, &cmd);
>>  }
>> 
>> +static int sd_app_op_cond_cb(void *cb_data, bool *busy)
>> +{
>> +	struct sd_app_op_cond_busy_data *data = cb_data;
>> +	struct mmc_host *host = data->host;
>> +	struct mmc_command *cmd = data->cmd;
>> +	u32 ocr = data->ocr;
>> +	int err;
> 
> Minor nitpick...  An empty line should be added here, to
> separate the variable definitions from the subsequent code.
> 
> Otherwise, the patch is looking to me, so please include my

Oops...  s/looking to me/looking good to me/
Sorry for the noise.

> Reviewed-by: Dragan Simic <dsimic@...jaro.org>
> 
>> +	*busy = false;
>> +
>> +	err = mmc_wait_for_app_cmd(host, NULL, cmd);
>> +	if (err)
>> +		return err;
>> +
>> +	/* If we're just probing, do a single pass. */
>> +	if (ocr == 0)
>> +		return 0;
>> +
>> +	/* Wait until reset completes. */
>> +	if (mmc_host_is_spi(host)) {
>> +		if (!(cmd->resp[0] & R1_SPI_IDLE))
>> +			return 0;
>> +	} else if (cmd->resp[0] & MMC_CARD_BUSY) {
>> +		return 0;
>> +	}
>> +
>> +	*busy = true;
>> +	return 0;
>> +}
>> +
>>  int mmc_send_app_op_cond(struct mmc_host *host, u32 ocr, u32 *rocr)
>>  {
>>  	struct mmc_command cmd = {};
>> -	int i, err = 0;
>> +	struct sd_app_op_cond_busy_data cb_data = {
>> +		.host = host,
>> +		.ocr = ocr,
>> +		.cmd = &cmd
>> +	};
>> +	int err;
>> 
>>  	cmd.opcode = SD_APP_OP_COND;
>>  	if (mmc_host_is_spi(host))
>> @@ -127,36 +170,16 @@ int mmc_send_app_op_cond(struct mmc_host *host,
>> u32 ocr, u32 *rocr)
>>  		cmd.arg = ocr;
>>  	cmd.flags = MMC_RSP_SPI_R1 | MMC_RSP_R3 | MMC_CMD_BCR;
>> 
>> -	for (i = 100; i; i--) {
>> -		err = mmc_wait_for_app_cmd(host, NULL, &cmd);
>> -		if (err)
>> -			break;
>> -
>> -		/* if we're just probing, do a single pass */
>> -		if (ocr == 0)
>> -			break;
>> -
>> -		/* otherwise wait until reset completes */
>> -		if (mmc_host_is_spi(host)) {
>> -			if (!(cmd.resp[0] & R1_SPI_IDLE))
>> -				break;
>> -		} else {
>> -			if (cmd.resp[0] & MMC_CARD_BUSY)
>> -				break;
>> -		}
>> -
>> -		err = -ETIMEDOUT;
>> -
>> -		mmc_delay(10);
>> -	}
>> -
>> -	if (!i)
>> -		pr_err("%s: card never left busy state\n", mmc_hostname(host));
>> +	err = __mmc_poll_for_busy(host, SD_APP_OP_COND_PERIOD_US,
>> +				  SD_APP_OP_COND_TIMEOUT_MS, &sd_app_op_cond_cb,
>> +				  &cb_data);
>> +	if (err)
>> +		return err;
>> 
>>  	if (rocr && !mmc_host_is_spi(host))
>>  		*rocr = cmd.resp[0];
>> 
>> -	return err;
>> +	return 0;
>>  }
>> 
>>  static int __mmc_send_if_cond(struct mmc_host *host, u32 ocr, u8 
>> pcie_bits,