mmc: sdhci: SDMA may use Auto-CMD23 in v4 mode (7ed71a9d) · Commits · 戴 / test

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>

drivers/mmc/host/sdhci.c

+5 −2

Original line number	Diff line number	Diff line
		@@ -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");

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