Commit 7bda9482 authored Mar 22, 2019 by Christoph Muellner Committed by Ulf Hansson Apr 15, 2019

mmc: sdhci-of-arasan: Add DTS property to disable DCMDs.



Direct commands (DCMDs) are an optional feature of eMMC 5.1's command
queue engine (CQE). The Arasan eMMC 5.1 controller uses the CQHCI,
which exposes a control register bit to enable the feature.
The current implementation sets this bit unconditionally.

This patch allows to suppress the feature activation,
by specifying the property disable-cqe-dcmd.

Signed-off-by: Christoph Muellner <christoph.muellner@theobroma-systems.com>
Signed-off-by: Philipp Tomsich <philipp.tomsich@theobroma-systems.com>
Acked-by: Adrian Hunter <adrian.hunter@intel.com>
Fixes: 84362d79 ("mmc: sdhci-of-arasan: Add CQHCI support for arasan,sdhci-5.1")
Cc: stable@vger.kernel.org
Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>

parent 28f22fb7

drivers/mmc/host/sdhci-of-arasan.c

+4 −1

Original line number	Diff line number	Diff line
		@@ -832,7 +832,10 @@ static int sdhci_arasan_probe(struct platform_device *pdev)
		host->mmc_host_ops.start_signal_voltage_switch =
		sdhci_arasan_voltage_switch;
		sdhci_arasan->has_cqe = true;
		host->mmc->caps2 \|= MMC_CAP2_CQE \| MMC_CAP2_CQE_DCMD;
		host->mmc->caps2 \|= MMC_CAP2_CQE;

		if (!of_property_read_bool(np, "disable-cqe-dcmd"))
		host->mmc->caps2 \|= MMC_CAP2_CQE_DCMD;
		}

		ret = sdhci_arasan_add_host(sdhci_arasan);

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