diff options
| author | Chunyan Zhang | 2018-08-30 16:21:43 +0800 |
|---|---|---|
| committer | Ulf Hansson | 2018-10-08 11:40:43 +0200 |
| commit | 7ed71a9df4baf60cfcb009b3503e19fc4964e564 (patch) | |
| tree | 2a8832ba49718079fddbf7c472397abf012d7238 /drivers | |
| parent | 427b6514d0953bfc1d3fd8c404dcf839bdd8196a (diff) | |
mmc: sdhci: SDMA may use Auto-CMD23 in v4 mode
When Host Version 4 Enable is set to 1, SDMA uses ADMA System Address
register (05Fh-058h) instead of using register (000h-004h) to indicate
its system address of data location. The register (000h-004h) is
re-assigned to 32-bit Block Count and Auto CMD23 argument, so then SDMA
may use Auto CMD23.
Signed-off-by: Chunyan Zhang <zhang.chunyan@linaro.org>
Acked-by: Adrian Hunter <adrian.hunter@intel.com>
Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
Diffstat (limited to 'drivers')
| -rw-r--r-- | drivers/mmc/host/sdhci.c | 7 |
1 files changed, 5 insertions, 2 deletions
diff --git a/drivers/mmc/host/sdhci.c b/drivers/mmc/host/sdhci.c index c8951c0b8a24..0dda6f4b6a24 100644 --- a/drivers/mmc/host/sdhci.c +++ b/drivers/mmc/host/sdhci.c @@ -3844,10 +3844,13 @@ int sdhci_setup_host(struct sdhci_host *host) if (host->quirks & SDHCI_QUIRK_MULTIBLOCK_READ_ACMD12) host->flags |= SDHCI_AUTO_CMD12; - /* Auto-CMD23 stuff only works in ADMA or PIO. */ + /* + * For v3 mode, Auto-CMD23 stuff only works in ADMA or PIO. + * For v4 mode, SDMA may use Auto-CMD23 as well. + */ if ((host->version >= SDHCI_SPEC_300) && ((host->flags & SDHCI_USE_ADMA) || - !(host->flags & SDHCI_USE_SDMA)) && + !(host->flags & SDHCI_USE_SDMA) || host->v4_mode) && !(host->quirks2 & SDHCI_QUIRK2_ACMD23_BROKEN)) { host->flags |= SDHCI_AUTO_CMD23; DBG("Auto-CMD23 available\n"); |