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Date: Fri, 22 Mar 2019 12:38:05 +0100 From: Christoph Muellner <christoph.muellner@...obroma-systems.com> To: robh+dt@...nel.org, mark.rutland@....com, heiko@...ech.de, shawn.lin@...k-chips.com, ulf.hansson@...aro.org, adrian.hunter@...el.com Cc: Christoph Muellner <christoph.muellner@...obroma-systems.com>, Philipp Tomsich <philipp.tomsich@...obroma-systems.com>, Michal Simek <michal.simek@...inx.com>, Viresh Kumar <viresh.kumar@...aro.org>, Enric Balletbo i Serra <enric.balletbo@...labora.com>, Matthias Brugger <matthias.bgg@...il.com>, Douglas Anderson <dianders@...omium.org>, Tony Xie <tony.xie@...k-chips.com>, Randy Li <ayaka@...lik.info>, Vicente Bergas <vicencb@...il.com>, Ezequiel Garcia <ezequiel@...labora.com>, Klaus Goger <klaus.goger@...obroma-systems.com>, linux-mmc@...r.kernel.org, devicetree@...r.kernel.org, linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org, linux-rockchip@...ts.infradead.org Subject: [PATCH v3 2/3] 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@...obroma-systems.com> Signed-off-by: Philipp Tomsich <philipp.tomsich@...obroma-systems.com> Acked-by: Adrian Hunter <adrian.hunter@...el.com> --- drivers/mmc/host/sdhci-of-arasan.c | 5 ++++- 1 file changed, 4 insertions(+), 1 deletion(-) 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); -- 2.11.0
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