From: Lucas Stach <l.stach@pengutronix.de>
To: Ulf Hansson <ulf.hansson@linaro.org>,
Adrian Hunter <adrian.hunter@intel.com>,
Haibo Chen <haibo.chen@nxp.com>
Cc: Rob Herring <robh+dt@kernel.org>,
NXP Linux Team <linux-imx@nxp.com>,
kernel@pengutronix.de, linux-mmc@vger.kernel.org,
devicetree@vger.kernel.org, linux-arm-kernel@lists.infradead.org
Subject: [PATCH v2 3/3] mmc: core: add support for disabling HS400 mode via DT
Date: Mon, 10 May 2021 21:04:00 +0200 [thread overview]
Message-ID: <20210510190400.105162-3-l.stach@pengutronix.de> (raw)
In-Reply-To: <20210510190400.105162-1-l.stach@pengutronix.de>
From: Lucas Stach <dev@lynxeye.de>
On some boards the data strobe line isn't wired up, rendering HS400
support broken, even if both the controller and the eMMC claim to
support it. Allow to disable HS400 mode via DT.
Signed-off-by: Lucas Stach <dev@lynxeye.de>
---
v2:
- move to core
- actually disable all HS400 modes
---
drivers/mmc/core/host.c | 3 +++
1 file changed, 3 insertions(+)
diff --git a/drivers/mmc/core/host.c b/drivers/mmc/core/host.c
index 9b89a91b6b47..0e066c5f5243 100644
--- a/drivers/mmc/core/host.c
+++ b/drivers/mmc/core/host.c
@@ -351,6 +351,9 @@ int mmc_of_parse(struct mmc_host *host)
host->caps2 |= MMC_CAP2_NO_SD;
if (device_property_read_bool(dev, "no-mmc"))
host->caps2 |= MMC_CAP2_NO_MMC;
+ if (device_property_read_bool(dev, "no-mmc-hs400"))
+ host->caps2 &= ~(MMC_CAP2_HS400_1_8V | MMC_CAP2_HS400_1_2V |
+ MMC_CAP2_HS400_ES);
/* Must be after "non-removable" check */
if (device_property_read_u32(dev, "fixed-emmc-driver-type", &drv_type) == 0) {
--
2.31.1
next prev parent reply other threads:[~2021-05-10 19:11 UTC|newest]
Thread overview: 13+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-05-10 19:03 [PATCH v2 1/3] dt-bindings: mmc: add no-mmc-hs400 flag Lucas Stach
2021-05-10 19:03 ` [PATCH v2 2/3] mmc: sdhci-esdhc-imx: advertise HS400 mode through MMC caps Lucas Stach
2021-05-11 3:00 ` Bough Chen
2021-05-11 8:18 ` Lucas Stach
2021-05-11 12:40 ` Adrian Hunter
2021-05-12 2:23 ` Bough Chen
2021-05-24 14:10 ` Ulf Hansson
2021-05-10 19:04 ` Lucas Stach [this message]
2021-05-11 11:14 ` [PATCH v2 3/3] mmc: core: add support for disabling HS400 mode via DT Ulf Hansson
2021-05-11 11:54 ` Lucas Stach
2021-05-11 12:19 ` Ulf Hansson
2021-05-24 14:10 ` Ulf Hansson
2021-05-24 14:10 ` [PATCH v2 1/3] dt-bindings: mmc: add no-mmc-hs400 flag Ulf Hansson
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