mmc: core: Convert to use __mmc_poll_for_busy() SD_APP_OP_COND too

[PATCH] mmc: core: Convert to use __mmc_poll_for_busy() SD_APP_OP_COND too

Posted by Ulf Hansson 1 year, 9 months ago

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@linaro.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;
+	*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,
-- 
2.34.1

Re: [PATCH] mmc: core: Convert to use __mmc_poll_for_busy() SD_APP_OP_COND too

Posted by Dragan Simic 1 year, 9 months ago

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@linaro.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

Reviewed-by: Dragan Simic <dsimic@manjaro.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,

Re: [PATCH] mmc: core: Convert to use __mmc_poll_for_busy() SD_APP_OP_COND too

Posted by Ulf Hansson 1 year, 9 months ago

On Tue, 30 Apr 2024 at 03:17, Dragan Simic <dsimic@manjaro.org> 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@linaro.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.

Thanks for noticing, I have fixed it when applying!

>
> Otherwise, the patch is looking to me, so please include my
>
> Reviewed-by: Dragan Simic <dsimic@manjaro.org>

Thanks!

Kind regards
Uffe


>
> > +     *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,

Re: [PATCH] mmc: core: Convert to use __mmc_poll_for_busy() SD_APP_OP_COND too

Posted by Dragan Simic 1 year, 9 months ago

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@linaro.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@manjaro.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,

Re: [PATCH] mmc: core: Convert to use __mmc_poll_for_busy() SD_APP_OP_COND too

Posted by Yao Xiao 1 year, 9 months ago

Hi ulf,

On 2024/4/25 21:30, 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@linaro.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;
> +	*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,
The implementation looks solid and it works as expected in the scenarios 
I tested.
Acked-by: Felix Qin <xiaokeqinhealth@126.com>