According to eMMC specification v5.1 section 6.4.3, we should issue CMD1 repeatedly in the idle state until the eMMC is ready even if the mmc_attach_mmc() calls this function with ocr = 0. Otherwise some eMMC devices seems to enter the inactive mode after mmc_init_card() issued CMD0 when the eMMC device is busy.
Signed-off-by: Yoshihiro Shimoda <[email protected]> --- Changes from v1 (https://patchwork.kernel.org/patch/10874619/): - Revise the comment on the source code. We can reproduce this issue if: - we add no-sd and no-sdio property into sdhi2 node of salvator-common.dtsi, - the renesas_sdhi driver is kernel module, - Using a Salvator-XS board that has Samsung eMMC device, - enter suspend and exit it, - and then insmod renesas_sdhi_{core,internal_dmac}.ko. After that, the following error happened and any partitions are not detected. mmc1: error -110 whilst initialising MMC card I tested this patch on: - M3-N Salvator-XS with a Samsung eMMC device, - M3-W Salvator-X with SiliconMotion eMMC device, - and M3-W Starter Kit with Micron eMMC device. drivers/mmc/core/mmc_ops.c | 16 +++++++++++----- 1 file changed, 11 insertions(+), 5 deletions(-) diff --git a/drivers/mmc/core/mmc_ops.c b/drivers/mmc/core/mmc_ops.c index c5208fb..a533cab 100644 --- a/drivers/mmc/core/mmc_ops.c +++ b/drivers/mmc/core/mmc_ops.c @@ -184,11 +184,7 @@ int mmc_send_op_cond(struct mmc_host *host, u32 ocr, u32 *rocr) if (err) break; - /* if we're just probing, do a single pass */ - if (ocr == 0) - break; - - /* otherwise wait until reset completes */ + /* wait until reset completes */ if (mmc_host_is_spi(host)) { if (!(cmd.resp[0] & R1_SPI_IDLE)) break; @@ -200,6 +196,16 @@ int mmc_send_op_cond(struct mmc_host *host, u32 ocr, u32 *rocr) err = -ETIMEDOUT; mmc_delay(10); + + /* + * According to eMMC specification v5.1 section 6.4.3, we + * should issue CMD1 repeatedly in the idle state until + * the eMMC is ready. Otherwise some eMMC devices seem to enter + * the inactive mode after mmc_init_card() issued CMD0 when + * the eMMC device is busy. + */ + if (!ocr && !mmc_host_is_spi(host)) + cmd.arg = cmd.resp[0] | BIT(30); } if (rocr && !mmc_host_is_spi(host)) -- 2.7.4
