linux-kernel - RE: [PATCH v1 1/3] mmc: core: Add raw_boot_mult field to mmc_ext

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Message-ID: <MN2PR04MB699121991FCB80BE39FC106FFCE60@MN2PR04MB6991.namprd04.prod.outlook.com>
Date:   Sun, 1 Mar 2020 10:50:35 +0000
From:   Avri Altman <Avri.Altman@....com>
To:     Dmitry Osipenko <digetx@...il.com>, Jens Axboe <axboe@...nel.dk>,
        Thierry Reding <thierry.reding@...il.com>,
        Jonathan Hunter <jonathanh@...dia.com>,
        Michał Mirosław <mirq-linux@...e.qmqm.pl>,
        David Heidelberg <david@...t.cz>,
        Peter Geis <pgwipeout@...il.com>,
        Stephen Warren <swarren@...dotorg.org>,
        Nicolas Chauvet <kwizart@...il.com>,
        Ulf Hansson <ulf.hansson@...aro.org>,
        Adrian Hunter <adrian.hunter@...el.com>,
        Billy Laws <blaws05@...il.com>
CC:     "linux-tegra@...r.kernel.org" <linux-tegra@...r.kernel.org>,
        "linux-block@...r.kernel.org" <linux-block@...r.kernel.org>,
        Andrey Danin <danindrey@...l.ru>,
        Gilles Grandou <gilles@...ndou.net>,
        Ryan Grachek <ryan@...ted.us>,
        "linux-mmc@...r.kernel.org" <linux-mmc@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: RE: [PATCH v1 1/3] mmc: core: Add raw_boot_mult field to mmc_ext_csd

Hi,
> 
> 
> In order to support parsing of NVIDIA Tegra Partition Table format, we
> need to know the BOOT_SIZE_MULT value of the Extended CSD register
> because
> NVIDIA's bootloader linearizes the boot0/boot1/main partitions into a
> single virtual space, and thus, all partition addresses are shifted by
> the size of boot0 + boot1 partitions.
> 
> Signed-off-by: Dmitry Osipenko <digetx@...il.com>
> ---
>  drivers/mmc/core/mmc.c   | 2 ++
>  include/linux/mmc/card.h | 1 +
>  2 files changed, 3 insertions(+)
> 
> diff --git a/drivers/mmc/core/mmc.c b/drivers/mmc/core/mmc.c
> index f6912ded652d..88e5b4224d3c 100644
> --- a/drivers/mmc/core/mmc.c
> +++ b/drivers/mmc/core/mmc.c
> @@ -417,6 +417,8 @@ static int mmc_decode_ext_csd(struct mmc_card
> *card, u8 *ext_csd)
>                 ext_csd[EXT_CSD_ERASE_TIMEOUT_MULT];
>         card->ext_csd.raw_hc_erase_grp_size =
>                 ext_csd[EXT_CSD_HC_ERASE_GRP_SIZE];
> +       card->ext_csd.raw_boot_mult =
> +               ext_csd[EXT_CSD_BOOT_MULT];
You might want at this point multiply it by 128K,
And get rid of: part_size = ext_csd[EXT_CSD_BOOT_MULT] << 17;
Below...

Thanks,
Avri