[PATCH V6 7/9] mmc: sdhci: SDMA may use Auto-CMD23 in v4 mode
From: Chunyan Zhang <hidden>
Date: 2018-08-24 09:21:51
Also in:
lkml
Subsystem:
multimedia card (mmc), secure digital (sd) and sdio subsystem, secure digital host controller interface (sdhci) driver, the rest · Maintainers:
Ulf Hansson, Adrian Hunter, Linus Torvalds
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 <redacted> --- drivers/mmc/host/sdhci.c | 8 ++++++-- 1 file changed, 6 insertions(+), 2 deletions(-)
diff --git a/drivers/mmc/host/sdhci.c b/drivers/mmc/host/sdhci.c
index 7e01601..1cb55f2 100644
--- a/drivers/mmc/host/sdhci.c
+++ b/drivers/mmc/host/sdhci.c@@ -3828,10 +3828,14 @@ 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->v4_mode && !(host->flags & SDHCI_USE_SDMA)) || + (host->v4_mode && (host->flags & SDHCI_USE_SDMA))) && !(host->quirks2 & SDHCI_QUIRK2_ACMD23_BROKEN)) { host->flags |= SDHCI_AUTO_CMD23; DBG("Auto-CMD23 available\n");
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2.7.4