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Date: Fri, 07 Nov 2014 12:18:01 +0200
From: Adrian Hunter <adrian.hunter@...el.com>
To: Chanho Min <chanho.min@....com>,
'À¯ÇÑ°æ' <hankyung.yu@....com>
CC: 'Chris Ball' <chris@...ntf.net>,
'Ulf Hansson' <ulf.hansson@...aro.org>,
'Seungwon Jeon' <tgih.jun@...sung.com>,
'Jaehoon Chung' <jh80.chung@...sung.com>,
linux-mmc@...r.kernel.org, linux-kernel@...r.kernel.org,
'HyoJun Im' <hyojun.im@....com>, gunho.lee@....com
Subject: Re: [PATCH] mmc:core: fix hs400 timing selection
On 01/11/14 09:23, Chanho Min wrote:
>>> So change the operating mode and to lower the clock.
>>
>> I meant something different.
>>
>> With your patch I find that __mmc_switch() -> send_status() fails.
>>
>> So I suggest something like this:
>>
>> diff --git a/drivers/mmc/core/mmc.c b/drivers/mmc/core/mmc.c
>> index 92247c2..195d48a 100644
>> --- a/drivers/mmc/core/mmc.c
>> +++ b/drivers/mmc/core/mmc.c
>> @@ -1045,21 +1045,28 @@ static int mmc_select_hs400(struct mmc_card *card)
>> err = __mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
>> EXT_CSD_HS_TIMING, EXT_CSD_TIMING_HS,
>> card->ext_csd.generic_cmd6_time,
>> - true, true, true);
>> + true, false, false);
>> + if (!err) {
>> + u32 status;
>> +
>> + /*
>> + * According to JEDEC v5.01 spec (6.6.5), Clock frequency should
>> + * be set to a value not greater than 52MHz after the HS_TIMING
>> + * field is set to 0x1.
>> + */
>> + mmc_set_timing(card->host, MMC_TIMING_MMC_HS);
>> + mmc_set_bus_speed(card);
>> +
>> + err = __mmc_send_status(card, &status, false, 1);
>
> Why was retry-count changed to 1?
> Is there any reason not to use this?
> + err = mmc_send_status(card, &status);
Error bits are cleared when read, so if the status command is not
successful then error information may have been lost. So it does
not make sense to retry.
>
>
>> + if (!err)
>> + err = mmc_check_switch_status(card->host, status);
>> + }
>> if (err) {
>> pr_err("%s: switch to high-speed from hs200 failed, err:%d\n",
>> mmc_hostname(host), err);
>> return err;
>> }
>>
>> - /*
>> - * According to JEDEC v5.01 spec (6.6.5), Clock frequency should
>> - * be set to a value not greater than 52MHz after the HS_TIMING
>> - * field is set to 0x1.
>> - */
>> - mmc_set_timing(card->host, MMC_TIMING_MMC_HS);
>> - mmc_set_bus_speed(card);
>> -
>> err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
>> EXT_CSD_BUS_WIDTH,
>> EXT_CSD_DDR_BUS_WIDTH_8,
>> diff --git a/drivers/mmc/core/mmc_ops.c b/drivers/mmc/core/mmc_ops.c
>> index 23aa3a3..f917527 100644
>> --- a/drivers/mmc/core/mmc_ops.c
>> +++ b/drivers/mmc/core/mmc_ops.c
>> @@ -23,15 +23,12 @@
>>
>> #define MMC_OPS_TIMEOUT_MS (10 * 60 * 1000) /* 10 minute timeout */
>>
>> -static inline int __mmc_send_status(struct mmc_card *card, u32 *status,
>> - bool ignore_crc)
>> +int __mmc_send_status(struct mmc_card *card, u32 *status, bool ignore_crc,
>> + int retries)
>> {
>> int err;
>> struct mmc_command cmd = {0};
>>
>> - BUG_ON(!card);
>> - BUG_ON(!card->host);
>> -
>> cmd.opcode = MMC_SEND_STATUS;
>> if (!mmc_host_is_spi(card->host))
>> cmd.arg = card->rca << 16;
>> @@ -39,7 +36,7 @@ static inline int __mmc_send_status(struct mmc_card *card, u32 *status,
>> if (ignore_crc)
>> cmd.flags &= ~MMC_RSP_CRC;
>>
>> - err = mmc_wait_for_cmd(card->host, &cmd, MMC_CMD_RETRIES);
>> + err = mmc_wait_for_cmd(card->host, &cmd, retries);
>> if (err)
>> return err;
>>
>> @@ -54,7 +51,7 @@ static inline int __mmc_send_status(struct mmc_card *card, u32 *status,
>>
>> int mmc_send_status(struct mmc_card *card, u32 *status)
>> {
>> - return __mmc_send_status(card, status, false);
>> + return __mmc_send_status(card, status, false, MMC_CMD_RETRIES);
>> }
>>
>> static int _mmc_select_card(struct mmc_host *host, struct mmc_card *card)
>> @@ -419,6 +416,21 @@ int mmc_spi_set_crc(struct mmc_host *host, int use_crc)
>> return err;
>> }
>>
>> +int mmc_check_switch_status(struct mmc_host *host, u32 status)
>> +{
>> + if (mmc_host_is_spi(host)) {
>> + if (status & R1_SPI_ILLEGAL_COMMAND)
>> + return -EBADMSG;
>> + } else {
>> + if (status & 0xFDFFA000)
>> + pr_warn("%s: unexpected status %#x after switch\n",
>> + mmc_hostname(host), status);
>> + if (status & R1_SWITCH_ERROR)
>> + return -EBADMSG;
>> + }
>> + return 0;
>> +}
>> +
>> /**
>> * __mmc_switch - modify EXT_CSD register
>> * @card: the MMC card associated with the data transfer
>> @@ -497,7 +509,7 @@ int __mmc_switch(struct mmc_card *card, u8 set, u8 index, u8 value,
>> timeout = jiffies + msecs_to_jiffies(timeout_ms);
>> do {
>> if (send_status) {
>> - err = __mmc_send_status(card, &status, ignore_crc);
>> + err = __mmc_send_status(card, &status, ignore_crc, 1);
>> if (err)
>> return err;
>> }
>> @@ -524,18 +536,7 @@ int __mmc_switch(struct mmc_card *card, u8 set, u8 index, u8 value,
>> }
>> } while (R1_CURRENT_STATE(status) == R1_STATE_PRG);
>>
>> - if (mmc_host_is_spi(host)) {
>> - if (status & R1_SPI_ILLEGAL_COMMAND)
>> - return -EBADMSG;
>> - } else {
>> - if (status & 0xFDFFA000)
>> - pr_warn("%s: unexpected status %#x after switch\n",
>> - mmc_hostname(host), status);
>> - if (status & R1_SWITCH_ERROR)
>> - return -EBADMSG;
>> - }
>> -
>> - return 0;
>> + return mmc_check_switch_status(host, status);
>> }
>> EXPORT_SYMBOL_GPL(__mmc_switch);
>>
>> diff --git a/drivers/mmc/core/mmc_ops.h b/drivers/mmc/core/mmc_ops.h
>> index 6f4b00e..a59319c 100644
>> --- a/drivers/mmc/core/mmc_ops.h
>> +++ b/drivers/mmc/core/mmc_ops.h
>> @@ -20,7 +20,10 @@ int mmc_send_op_cond(struct mmc_host *host, u32 ocr, u32 *rocr);
>> int mmc_all_send_cid(struct mmc_host *host, u32 *cid);
>> int mmc_set_relative_addr(struct mmc_card *card);
>> int mmc_send_csd(struct mmc_card *card, u32 *csd);
>> +int __mmc_send_status(struct mmc_card *card, u32 *status, bool ignore_crc,
>> + int retries);
>> int mmc_send_status(struct mmc_card *card, u32 *status);
>> +int mmc_check_switch_status(struct mmc_host *host, u32 status);
>> int mmc_send_cid(struct mmc_host *host, u32 *cid);
>> int mmc_spi_read_ocr(struct mmc_host *host, int highcap, u32 *ocrp);
>> int mmc_spi_set_crc(struct mmc_host *host, int use_crc);
>
> Thanks
> Chanho
>
>
>
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