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Date: Thu, 30 Aug 2018 16:21:43 +0800 From: Chunyan Zhang <zhang.chunyan@...aro.org> To: Ulf Hansson <ulf.hansson@...aro.org>, Adrian Hunter <adrian.hunter@...el.com>, Rob Herring <robh+dt@...nel.org> Cc: linux-mmc@...r.kernel.org, linux-kernel@...r.kernel.org, Orson Zhai <orsonzhai@...il.com>, Baolin Wang <baolin.wang@...aro.org>, Billows Wu <billows.wu@...soc.com>, Jason Wu <jason.wu@...soc.com>, Chunyan Zhang <chunyan.zhang@...soc.com>, Chunyan Zhang <zhang.lyra@...il.com> Subject: [PATCH V8 7/9] 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: Chunyan Zhang <zhang.chunyan@...aro.org> --- drivers/mmc/host/sdhci.c | 7 +++++-- 1 file changed, 5 insertions(+), 2 deletions(-) diff --git a/drivers/mmc/host/sdhci.c b/drivers/mmc/host/sdhci.c index 62d843ac90..606d331 100644 --- a/drivers/mmc/host/sdhci.c +++ b/drivers/mmc/host/sdhci.c @@ -3834,10 +3834,13 @@ 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"); -- 2.7.4
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