Hi Peng,

From: Peng.Fan@freescale.com [Peng.Fan@freescale.com] Sent: Friday, March 20, 2015 03:51 To: Gabbasov, Andrew; u-boot@lists.denx.de Subject: RE: [U-Boot] [PATCH 4/6] mmc: Continue polling MMC card for OCR

only if it is still not ready

Hi, Andrew

There is already a patch to fix this issue. Patchwork: https://patchwork.ozlabs.org/patch/451775/

Regards, Peng.

Yes, I noticed it just after I sent this series. ;-) Unfortunately, the patch, that you mention, has some drawback that I described in a separate message (in response to the patch). Basically, it leaves the code in some not quite correct state. This series hopefully does not have this drawback and besides fixing the issue has some more useful changes in a single complex.

Thanks.

Best regards, Andrew

-----Original Message----- From: U-Boot [mailto:u-boot-bounces@lists.denx.de] On Behalf Of Andrew Gabbasov Sent: Thursday, March 19, 2015 8:44 PM To: u-boot@lists.denx.de Subject: [U-Boot] [PATCH 4/6] mmc: Continue polling MMC card for OCR only if it is still not ready

Some MMC cards come to ready state quite quickly, so that the respective flag appears to be set in mmc_send_op_cond already. In this case trying to continue polling the card with CMD1 in mmc_complete_op_cond is incorrect and may lead to unpredictable results. So check the flag before polling and skip it appropriately.

Signed-off-by: Andrew Gabbasov andrew_gabbasov@mentor.com --- drivers/mmc/mmc.c | 20 +++++++++++--------- 1 file changed, 11 insertions(+), 9 deletions(-)

diff --git a/drivers/mmc/mmc.c b/drivers/mmc/mmc.c index d073d79..42af47c 100644 --- a/drivers/mmc/mmc.c +++ b/drivers/mmc/mmc.c @@ -403,15 +403,17 @@ static int mmc_complete_op_cond(struct mmc *mmc) int err;

mmc->op_cond_pending = 0; - start = get_timer(0); - do { - err = mmc_send_op_cond_iter(mmc, 1); - if (err) - return err; - if (get_timer(start) > timeout) - return UNUSABLE_ERR; - udelay(100); - } while (!(mmc->ocr & OCR_BUSY)); + if (!(mmc->ocr & OCR_BUSY)) { + start = get_timer(0); + do { + err = mmc_send_op_cond_iter(mmc, 1); + if (err) + return err; + if (get_timer(start) > timeout) + return UNUSABLE_ERR; + udelay(100); + } while (!(mmc->ocr & OCR_BUSY)); + }

if (mmc_host_is_spi(mmc)) { /* read OCR for spi */ cmd.cmdidx = MMC_CMD_SPI_READ_OCR; -- 2.1.0

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