Commit 7ed71a9d authored by Chunyan Zhang's avatar Chunyan Zhang Committed by Ulf Hansson
Browse files

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: default avatarChunyan Zhang <>
Acked-by: default avatarAdrian Hunter <>
Signed-off-by: default avatarUlf Hansson <>
parent 427b6514
......@@ -3844,10 +3844,13 @@ int sdhci_setup_host(struct sdhci_host *host)
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");
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