On Tue, 9 Apr 2019 at 13:09, Yoshihiro Shimoda <yoshihiro.shimoda.uh@xxxxxxxxxxx> wrote: > > 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 <yoshihiro.shimoda.uh@xxxxxxxxxxx> Applied for next, thanks! Let's get some test coverage of this before we decide if this a material for stable. Kind regards Uffe > --- > 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 >
