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| author | Adrian Hunter <adrian.hunter@intel.com> | 2016-06-29 15:24:16 +0200 |
|---|---|---|
| committer | Ulf Hansson <ulf.hansson@linaro.org> | 2016-07-25 10:34:34 +0200 |
| commit | 8cb851a4da64aa838c3cb4fa76ad130ace2b5a98 (patch) | |
| tree | 3ed652f9d0267aeb7be5ec59ca979d2ae9f42778 /drivers/mmc/host/sdhci.h | |
| parent | mmc: sdhci: Split sdhci_add_host() (diff) | |
| download | linux-8cb851a4da64aa838c3cb4fa76ad130ace2b5a98.tar.xz linux-8cb851a4da64aa838c3cb4fa76ad130ace2b5a98.zip | |
mmc: sdhci: Make signal voltage support explicit
Signal voltage support is not a quirk, it is a capability. According to the
SDHCI specification, support for 1.8V signaling is determined by the
presence of one of the capability bits SDHCI_SUPPORT_SDR50,
SDHCI_SUPPORT_SDR104, or SDHCI_SUPPORT_DDR50. This is complicated by also
supporting eMMC which has 1.8V modes and 1.2V modes. It would be possible
to use the transfer mode to determine signal voltage support, except for
eMMC DDR52 mode which uses the same capability (MMC_CAP_1_8V_DDR) for 1.8V
signaling and 3V signaling.
In addition, the mmc core will fail over from one signaling voltage to the
next (refer mmc_power_up()) which means SDHCI really needs to validate
which voltages are actually supported.
Introduce SDHCI flags for signal voltage support and set them based on the
supported transfer modes. In general, drivers should prefer to set the
supported transfer modes correctly rather than change the signal voltage
capability, except in the case where 3V DDR52 is supported but 1.8V is
not.
Signed-off-by: Adrian Hunter <adrian.hunter@intel.com>
Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
Diffstat (limited to 'drivers/mmc/host/sdhci.h')
| -rw-r--r-- | drivers/mmc/host/sdhci.h | 3 |
1 files changed, 3 insertions, 0 deletions
diff --git a/drivers/mmc/host/sdhci.h b/drivers/mmc/host/sdhci.h index b16aec2faa2e..419911f107d3 100644 --- a/drivers/mmc/host/sdhci.h +++ b/drivers/mmc/host/sdhci.h @@ -447,6 +447,9 @@ struct sdhci_host { #define SDHCI_SDIO_IRQ_ENABLED (1<<9) /* SDIO irq enabled */ #define SDHCI_USE_64_BIT_DMA (1<<12) /* Use 64-bit DMA */ #define SDHCI_HS400_TUNING (1<<13) /* Tuning for HS400 */ +#define SDHCI_SIGNALING_330 (1<<14) /* Host is capable of 3.3V signaling */ +#define SDHCI_SIGNALING_180 (1<<15) /* Host is capable of 1.8V signaling */ +#define SDHCI_SIGNALING_120 (1<<16) /* Host is capable of 1.2V signaling */ unsigned int version; /* SDHCI spec. version */ |