From: Christoph Muellner <christoph.muellner@theobroma-systems.com>
To: robh+dt@kernel.org, mark.rutland@arm.com, heiko@sntech.de,
shawn.lin@rock-chips.com, ulf.hansson@linaro.org,
adrian.hunter@intel.com
Cc: Christoph Muellner <christoph.muellner@theobroma-systems.com>,
Philipp Tomsich <philipp.tomsich@theobroma-systems.com>,
Michal Simek <michal.simek@xilinx.com>,
Douglas Anderson <dianders@chromium.org>,
Enric Balletbo i Serra <enric.balletbo@collabora.com>,
Viresh Kumar <viresh.kumar@linaro.org>,
Jeffy Chen <jeffy.chen@rock-chips.com>,
Shunqian Zheng <zhengsq@rock-chips.com>,
Ezequiel Garcia <ezequiel@collabora.com>,
Randy Li <ayaka@soulik.info>, Tony Xie <tony.xie@rock-chips.com>,
Vicente Bergas <vicencb@gmail.com>,
Klaus Goger <klaus.goger@theobroma-systems.com>,
linux-mmc@vger.kernel.org, devicetree@vger.kernel.org,
linux-kernel@vger.kernel.org,
linux-arm-kernel@lists.infradead.org,
linux-rockchip@lists.infradead.org
Subject: [PATCH 1/3] dt-bindings: mmc: Add DTS property to disable DCMDs on Arasan controllers
Date: Fri, 1 Mar 2019 17:43:45 +0100 [thread overview]
Message-ID: <20190301164349.60589-1-christoph.muellner@theobroma-systems.com> (raw)
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 surpress 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>
---
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
next reply other threads:[~2019-03-01 16:44 UTC|newest]
Thread overview: 8+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-03-01 16:43 Christoph Muellner [this message]
2019-03-01 16:43 ` [PATCH 2/3] dt-bindings: mmc: Add a new property disable-cqe-dcmd Christoph Muellner
2019-03-01 16:45 ` Philipp Tomsich
2019-03-01 16:43 ` [PATCH 3/3] arm64: dts: rockchip: Disable DCMDs on RK3399's eMMC controller Christoph Muellner
2019-03-02 0:47 ` [PATCH 3/3] arm64: dts: rockchip: Disable DCMDs on RK3399's eMMC controller.【请注意，邮件由linux-mmc-owner@vger.kernel.org代发】 Shawn Lin
2019-03-02 8:26 ` Christoph Müllner
2019-03-01 18:17 ` [PATCH 1/3] dt-bindings: mmc: Add DTS property to disable DCMDs on Arasan controllers Heiko Stuebner
2019-03-01 18:19 ` Christoph Müllner
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