diff options
| author | Christoph Muellner <christoph.muellner@theobroma-systems.com> | 2019-03-01 14:43:58 +0100 |
|---|---|---|
| committer | Christoph Müllner <christophm30@gmail.com> | 2019-04-07 15:23:03 +0200 |
| commit | c1e761821204b31ad5e413af326ba1513ec247ca (patch) | |
| tree | 2d25df19af1949c635bbebae9af302841718e830 | |
| parent | eca667c3f7f7c6687db7542a7ddced5669e64ff8 (diff) | |
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>
| -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 a40bcc27f187..7fdac277e382 100644 --- a/drivers/mmc/host/sdhci-of-arasan.c +++ b/drivers/mmc/host/sdhci-of-arasan.c @@ -814,7 +814,10 @@ 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); |