Messages in this thread | | | From | Ulf Hansson <> | Date | Tue, 17 Dec 2019 08:09:32 +0100 | Subject | Re: [<PATCH v1> 1/9] mmc: core: Add a cap to use long discard size |
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On Tue, 17 Dec 2019 at 03:52, Bao D. Nguyen <nguyenb@codeaurora.org> wrote: > > Add MMC_CAP2_MAX_DISCARD_SIZE cap which allows setting the max > discard size value if needed. > Setting a high value for the max discard size is to fix an issue where > some SD cards take a long time to perform the card format.
Can you please explain elaborate on why the SD card takes a long time to "format"? What goes on and what takes time, etc.
In any case, it looks wrong to add a host cap to solve this problem.
Kind regards Uffe
> > Signed-off-by: Bao D. Nguyen <nguyenb@codeaurora.org> > --- > include/linux/mmc/host.h | 1 + > 1 file changed, 1 insertion(+) > > diff --git a/include/linux/mmc/host.h b/include/linux/mmc/host.h > index ba70338..f1a767d 100644 > --- a/include/linux/mmc/host.h > +++ b/include/linux/mmc/host.h > @@ -348,6 +348,7 @@ struct mmc_host { > #define MMC_CAP2_FULL_PWR_CYCLE (1 << 2) /* Can do full power cycle */ > #define MMC_CAP2_HS200_1_8V_SDR (1 << 5) /* can support */ > #define MMC_CAP2_HS200_1_2V_SDR (1 << 6) /* can support */ > +#define MMC_CAP2_MAX_DISCARD_SIZE (1 << 8) /* use max discard, ignoring max_busy_timeout parameter */ > #define MMC_CAP2_HS200 (MMC_CAP2_HS200_1_8V_SDR | \ > MMC_CAP2_HS200_1_2V_SDR) > #define MMC_CAP2_CD_ACTIVE_HIGH (1 << 10) /* Card-detect signal active high */ > -- > The Qualcomm Innovation Center, Inc. is a member of the Code Aurora Forum, > a Linux Foundation Collaborative Project
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