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Commit 7ed71a9d authored by Chunyan Zhang's avatar Chunyan Zhang Committed by Ulf Hansson
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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 <zhang.chunyan@linaro.org>
Acked-by: default avatarAdrian Hunter <adrian.hunter@intel.com>
Signed-off-by: default avatarUlf Hansson <ulf.hansson@linaro.org>
parent 427b6514

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");