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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: 84362d79f4 ("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>
This commit is contained in:
Christoph Muellner 2019-03-22 12:38:05 +01:00 committed by Ulf Hansson
parent 28f22fb755
commit 7bda9482e7
1 changed files with 4 additions and 1 deletions
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5
drivers/mmc/host/sdhci-of-arasan.c
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@ -832,7 +832,10 @@ static int sdhci_arasan_probe(struct platform_device *pdev)
host->mmc_host_ops.start_signal_voltage_switch = host->mmc_host_ops.start_signal_voltage_switch =
sdhci_arasan_voltage_switch; sdhci_arasan_voltage_switch;
sdhci_arasan->has_cqe = true; 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); ret = sdhci_arasan_add_host(sdhci_arasan);