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mmc: do not change mode when accessing a boot partition

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Accessing the boot partition had been error prone with HS200 and HS400 and
was disabled. The driver first switched to a lesser mode and then switched
the partition access. It was mostly due to a bad handling of the switch and
has been fixed, so let's remove this 'feature'

Signed-off-by: Jean-Jacques Hiblot <jjhiblot@ti.com>
This commit is contained in:
Jean-Jacques Hiblot 2019-07-02 10:53:57 +02:00 committed by Peng Fan
parent bb98b8c5c0
commit 9bc5666c8a
1 changed files with 0 additions and 36 deletions
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36
drivers/mmc/mmc.c
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@ -955,46 +955,10 @@ static int mmc_set_capacity(struct mmc *mmc, int part_num)
return 0;
}
#if CONFIG_IS_ENABLED(MMC_HS200_SUPPORT) || CONFIG_IS_ENABLED(MMC_HS400_SUPPORT)
static int mmc_boot_part_access_chk(struct mmc *mmc, unsigned int part_num)
{
int forbidden = 0;
bool change = false;
if (part_num & PART_ACCESS_MASK)
forbidden = MMC_CAP(MMC_HS_200) | MMC_CAP(MMC_HS_400);
if (MMC_CAP(mmc->selected_mode) & forbidden) {
pr_debug("selected mode (%s) is forbidden for part %d\n",
mmc_mode_name(mmc->selected_mode), part_num);
change = true;
} else if (mmc->selected_mode != mmc->best_mode) {
pr_debug("selected mode is not optimal\n");
change = true;
}
if (change)
return mmc_select_mode_and_width(mmc,
mmc->card_caps & ~forbidden);
return 0;
}
#else
static inline int mmc_boot_part_access_chk(struct mmc *mmc,
unsigned int part_num)
{
return 0;
}
#endif
int mmc_switch_part(struct mmc *mmc, unsigned int part_num)
{
int ret;
ret = mmc_boot_part_access_chk(mmc, part_num);
if (ret)
return ret;
ret = mmc_switch(mmc, EXT_CSD_CMD_SET_NORMAL, EXT_CSD_PART_CONF,
(mmc->part_config & ~PART_ACCESS_MASK)
| (part_num & PART_ACCESS_MASK));