Messages in this thread Patch in this message | | | From | Shawn Lin <> | Subject | [PATCH v2 2/6] mmc: core: add mmc-hs400-enhanced-strobe support | Date | Fri, 29 Apr 2016 10:46:35 +0800 |
| |
This patch introduce mmc-hs400-enhanced-strobe for platforms which want to enable enhanced strobe function from DT if the mmc host controller claims to support enhanced strobe.
Signed-off-by: Shawn Lin <shawn.lin@rock-chips.com>
---
Changes in v2: - switch to HS400ES from Highspeed mode directly
drivers/mmc/core/host.c | 2 ++ include/linux/mmc/host.h | 6 ++++++ 2 files changed, 8 insertions(+)
diff --git a/drivers/mmc/core/host.c b/drivers/mmc/core/host.c index e0a3ee1..eb1530a 100644 --- a/drivers/mmc/core/host.c +++ b/drivers/mmc/core/host.c @@ -289,6 +289,8 @@ int mmc_of_parse(struct mmc_host *host) host->caps2 |= MMC_CAP2_HS400_1_8V | MMC_CAP2_HS200_1_8V_SDR; if (of_property_read_bool(np, "mmc-hs400-1_2v")) host->caps2 |= MMC_CAP2_HS400_1_2V | MMC_CAP2_HS200_1_2V_SDR; + if (of_property_read_bool(np, "mmc-hs400-enhanced-strobe")) + host->caps2 |= MMC_CAP2_HS400_ENHANCED_STROBE; host->dsr_req = !of_property_read_u32(np, "dsr", &host->dsr); if (host->dsr_req && (host->dsr & ~0xffff)) { diff --git a/include/linux/mmc/host.h b/include/linux/mmc/host.h index 85800b4..11e89d3 100644 --- a/include/linux/mmc/host.h +++ b/include/linux/mmc/host.h @@ -302,6 +302,7 @@ struct mmc_host { #define MMC_CAP2_SDIO_IRQ_NOTHREAD (1 << 17) #define MMC_CAP2_NO_WRITE_PROTECT (1 << 18) /* No physical write protect pin, assume that card is always read-write */ #define MMC_CAP2_NO_SDIO (1 << 19) /* Do not send SDIO commands during initialization */ +#define MMC_CAP2_HS400_ENHANCED_STROBE (1 << 20) /* Host supports enhanced strobe */ mmc_pm_flag_t pm_caps; /* supported pm features */ @@ -480,6 +481,11 @@ static inline int mmc_host_uhs(struct mmc_host *host) MMC_CAP_UHS_DDR50); } +static inline int mmc_host_hs400_enhanced_strobe(struct mmc_host *host) +{ + return host->caps2 & MMC_CAP2_HS400_ENHANCED_STROBE; +} + static inline int mmc_host_packed_wr(struct mmc_host *host) { return host->caps2 & MMC_CAP2_PACKED_WR; -- 2.3.7
| |