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| author | Christoph Muellner <christoph.muellner@theobroma-systems.com> | 2019-03-22 14:38:05 +0300 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2019-05-22 08:39:40 +0300 |
| commit | 26939d0bc1082f07c8a71aef5304614db29d8f3a (patch) | |
| tree | 3b849cc1ea82a7a0dbda2ba73d6e2ad181f31a5b /drivers | |
| parent | 54d791321a25eb400314811701717b1a2988406c (diff) | |
| download | linux-26939d0bc1082f07c8a71aef5304614db29d8f3a.tar.xz | |
mmc: sdhci-of-arasan: Add DTS property to disable DCMDs.
commit 7bda9482e7ed4d27d83c1f9cb5cbe3b34ddac3e8 upstream.
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: 84362d79f436 ("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>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers')
| -rw-r--r-- | drivers/mmc/host/sdhci-of-arasan.c | 5 |
1 files changed, 4 insertions, 1 deletions
diff --git a/drivers/mmc/host/sdhci-of-arasan.c b/drivers/mmc/host/sdhci-of-arasan.c index c9e3e050ccc8..88dc3f00a5be 100644 --- a/drivers/mmc/host/sdhci-of-arasan.c +++ b/drivers/mmc/host/sdhci-of-arasan.c @@ -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); |