diff options
| author | Asutosh Das <asutoshd@codeaurora.org> | 2017-03-30 14:41:16 -0700 |
|---|---|---|
| committer | Subhash Jadavani <subhashj@codeaurora.org> | 2017-04-03 10:43:14 -0700 |
| commit | 0cbf1d2db710f0b9fb0b63934d214b2ef19cd650 (patch) | |
| tree | 18f031fea0300976abd537f6556a096e28edf3bd /include | |
| parent | a4b36d773babd517b8208d487ea6beb060aab610 (diff) | |
mmc: sd: reduce the bus speed in case of multiple CRC errors in SDR104
UHS-I SD cards support SDR104 mode which runs the SD card interface
clock upto 208 MHz. But we may see repeated CRC errors in SDR104
with some SDCC controllers. If this happens, this change would
reinit the card to lower speed (SDR50) hoping that CRC error
rate would reduce at lower clock speed (100MHz for SDR50).
Change-Id: I140d29fdf500bb89881a0f2c1f768fe0c5afa9d5
Signed-off-by: Asutosh Das <asutoshd@codeaurora.org>
Signed-off-by: Subhash Jadavani <subhashj@codeaurora.org>
Diffstat (limited to 'include')
| -rw-r--r-- | include/linux/mmc/card.h | 2 | ||||
| -rw-r--r-- | include/linux/mmc/core.h | 1 | ||||
| -rw-r--r-- | include/linux/mmc/host.h | 10 |
3 files changed, 13 insertions, 0 deletions
diff --git a/include/linux/mmc/card.h b/include/linux/mmc/card.h index 1c87478b5fc0..e7e172a23a16 100644 --- a/include/linux/mmc/card.h +++ b/include/linux/mmc/card.h @@ -435,6 +435,8 @@ struct mmc_card { u8 *cached_ext_csd; bool cmdq_init; struct mmc_bkops_info bkops; + bool err_in_sdr104; + bool sdr104_blocked; }; /* diff --git a/include/linux/mmc/core.h b/include/linux/mmc/core.h index 1068953943d8..2a1a6fec179f 100644 --- a/include/linux/mmc/core.h +++ b/include/linux/mmc/core.h @@ -169,6 +169,7 @@ extern int __mmc_switch_cmdq_mode(struct mmc_command *cmd, u8 set, u8 index, extern int mmc_send_tuning(struct mmc_host *host, u32 opcode, int *cmd_error); extern int mmc_get_ext_csd(struct mmc_card *card, u8 **new_ext_csd); extern int mmc_set_auto_bkops(struct mmc_card *card, bool enable); +extern int mmc_suspend_clk_scaling(struct mmc_host *host); #define MMC_ERASE_ARG 0x00000000 #define MMC_SECURE_ERASE_ARG 0x80000000 diff --git a/include/linux/mmc/host.h b/include/linux/mmc/host.h index 37069eb12861..d9e12c1b1748 100644 --- a/include/linux/mmc/host.h +++ b/include/linux/mmc/host.h @@ -729,6 +729,16 @@ static inline int mmc_host_uhs(struct mmc_host *host) MMC_CAP_UHS_DDR50); } +static inline void mmc_host_clear_sdr104(struct mmc_host *host) +{ + host->caps &= ~MMC_CAP_UHS_SDR104; +} + +static inline void mmc_host_set_sdr104(struct mmc_host *host) +{ + host->caps |= MMC_CAP_UHS_SDR104; +} + static inline int mmc_host_packed_wr(struct mmc_host *host) { return host->caps2 & MMC_CAP2_PACKED_WR; |