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mmc: block: support no access to boot partitions

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Intel Medfield platform blocks access to eMMC boot partitions which
results in switch errors.  Since there is no access, mmcboot0/1
devices should not be created.  Add a host capability to reflect that.

Signed-off-by: Adrian Hunter <adrian.hunter@intel.com>
Signed-off-by: Chris Ball <cjb@laptop.org>
This commit is contained in:
Adrian Hunter 2011-09-23 12:48:21 +03:00 committed by Chris Ball
parent 0d7d85ca6e
commit f7c56ef2af
3 changed files with 13 additions and 1 deletions
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2
drivers/mmc/card/block.c
View file

@ -1480,7 +1480,7 @@ static int mmc_blk_alloc_parts(struct mmc_card *card, struct mmc_blk_data *md)
if (!mmc_card_mmc(card))
return 0;
if (card->ext_csd.boot_size) {
if (card->ext_csd.boot_size && mmc_boot_partition_access(card->host)) {
ret = mmc_blk_alloc_part(card, md, EXT_CSD_PART_CONFIG_ACC_BOOT0,
card->ext_csd.boot_size >> 9,
true,

2
drivers/mmc/host/sdhci-pci.c
View file

@ -215,6 +215,8 @@ static int mfd_emmc_probe_slot(struct sdhci_pci_slot *slot)
slot->host->mmc->caps |= MMC_CAP_8_BIT_DATA;
slot->host->mmc->caps2 = MMC_CAP2_BOOTPART_NOACC;
return 0;
}

10
include/linux/mmc/host.h
View file

@ -236,6 +236,10 @@ struct mmc_host {
#define MMC_CAP_CMD23 (1 << 30) /* CMD23 supported. */
#define MMC_CAP_HW_RESET (1 << 31) /* Hardware reset */
unsigned int caps2; /* More host capabilities */
#define MMC_CAP2_BOOTPART_NOACC (1 << 0) /* Boot partition no access */
mmc_pm_flag_t pm_caps; /* supported pm features */
#ifdef CONFIG_MMC_CLKGATE
@ -404,4 +408,10 @@ static inline int mmc_host_cmd23(struct mmc_host *host)
{
return host->caps & MMC_CAP_CMD23;
}
static inline int mmc_boot_partition_access(struct mmc_host *host)
{
return !(host->caps2 & MMC_CAP2_BOOTPART_NOACC);
}
#endif /* LINUX_MMC_HOST_H */