diff options
| author | Sowjanya Komatineni <skomatineni@nvidia.com> | 2019-01-23 11:30:53 -0800 |
|---|---|---|
| committer | Ulf Hansson <ulf.hansson@linaro.org> | 2019-02-25 08:40:58 +0100 |
| commit | 4c4faff62bf59e64c5175b7704727e6b9db361f2 (patch) | |
| tree | 7131cbe49c104f7817e91cf598a065188f476dcd /drivers/mmc/host/sdhci.c | |
| parent | c7fddbd5db5cffd10ed4d18efa20e36803d1899f (diff) | |
| download | linux-4c4faff62bf59e64c5175b7704727e6b9db361f2.tar.bz2 | |
mmc: sdhci: Add ADMA3 DMA support for V4 enabled host
Below are the supported DMA types in Host Control1 Register
with Version 4 enable
b'00 - SDMA
b'01 - Not Used
b'10 - ADMA2
b'11 - ADMA2 or ADMA3
ADMA3 uses Command Descriptor to issue an SD command.
A multi-block data transfer is performed by using a pair of CMD
descriptor and ADMA2 descriptor.
ADMA3 performs multiple of multi-block data transfer by using
Integrated Descriptor which is more suitable for Command Queuing
to fetch both Command and Transfer descriptors.
Host Capabilities register indicates the supports of ADMA3 DMA.
Signed-off-by: Sowjanya Komatineni <skomatineni@nvidia.com>
Acked-by: Adrian Hunter <adrian.hunter@intel.com>
Reviewed-by: Thierry Reding <treding@nvidia.com>
Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
Diffstat (limited to 'drivers/mmc/host/sdhci.c')
| -rw-r--r-- | drivers/mmc/host/sdhci.c | 9 |
1 files changed, 8 insertions, 1 deletions
diff --git a/drivers/mmc/host/sdhci.c b/drivers/mmc/host/sdhci.c index c8ca3ce316c4..39bbbd754781 100644 --- a/drivers/mmc/host/sdhci.c +++ b/drivers/mmc/host/sdhci.c @@ -3359,7 +3359,14 @@ void sdhci_cqe_enable(struct mmc_host *mmc) ctrl = sdhci_readb(host, SDHCI_HOST_CONTROL); ctrl &= ~SDHCI_CTRL_DMA_MASK; - if (host->flags & SDHCI_USE_64_BIT_DMA) + /* + * Host from V4.10 supports ADMA3 DMA type. + * ADMA3 performs integrated descriptor which is more suitable + * for cmd queuing to fetch both command and transfer descriptors. + */ + if (host->v4_mode && (host->caps1 & SDHCI_CAN_DO_ADMA3)) + ctrl |= SDHCI_CTRL_ADMA3; + else if (host->flags & SDHCI_USE_64_BIT_DMA) ctrl |= SDHCI_CTRL_ADMA64; else ctrl |= SDHCI_CTRL_ADMA32; |