[PATCH 2/2] mmc: block: support no access to boot partitions

Adrian Hunter
2011-09-23T09:48:34Z

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>
---
drivers/mmc/card/block.c | 2 +-
drivers/mmc/host/sdhci-pci.c | 2 ++
include/linux/mmc/host.h | 10 ++++++++++
3 files changed, 13 insertions(+), 1 deletions(-)

diff --git a/drivers/mmc/card/block.c b/drivers/mmc/card/block.c
index 2350ac9..ad005e5 100644
--- a/drivers/mmc/card/block.c
+++ b/drivers/mmc/card/block.c
@@ -1478,7 +1478,7 @@ 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,
diff --git a/drivers/mmc/host/sdhci-pci.c b/drivers/mmc/host/sdhci-pci.c
index 3b30c51..f8a17f9 100644
--- a/drivers/mmc/host/sdhci-pci.c
+++ b/drivers/mmc/host/sdhci-pci.c
@@ -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;
}

diff --git a/include/linux/mmc/host.h b/include/linux/mmc/host.h
index b2aefea..aed5bc7 100644
--- a/include/linux/mmc/host.h
+++ b/include/linux/mmc/host.h
@@ -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 */
--
1.7.6