linux-kernel - [PATCH v3 05/11] mmc: sdhci: Disable HS200 mode if controller can't support 1.8v

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Date:   Wed, 7 Mar 2018 18:50:14 +0530
From:   Kishon Vijay Abraham I <kishon@...com>
To:     Ulf Hansson <ulf.hansson@...aro.org>,
        Tony Lindgren <tony@...mide.com>,
        Adrian Hunter <adrian.hunter@...el.com>
CC:     Rob Herring <robh+dt@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        Russell King <linux@...linux.org.uk>, <kishon@...com>,
        <linux-mmc@...r.kernel.org>, <devicetree@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>, <linux-omap@...r.kernel.org>,
        <linux-arm-kernel@...ts.infradead.org>
Subject: [PATCH v3 05/11] mmc: sdhci: Disable HS200 mode if controller can't support 1.8v

Though MMC controller can indicate HS200 mode capability (by
using "mmc-hs200-1_8v" dt property), if the IO lines in the board
is connected to 3.3v supply, HS200 mode cannot be supported.
Such boards have "no-1-8-v" property in their dts file. Disable HS200
mode for boards which have "no-1-8-v" set.

Signed-off-by: Kishon Vijay Abraham I <kishon@...com>
---
 drivers/mmc/host/sdhci.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/drivers/mmc/host/sdhci.c b/drivers/mmc/host/sdhci.c
index 2ededa7f43df..aa8b5ca0d1b0 100644
--- a/drivers/mmc/host/sdhci.c
+++ b/drivers/mmc/host/sdhci.c
@@ -3672,6 +3672,7 @@ int sdhci_setup_host(struct sdhci_host *host)
 	if (host->quirks2 & SDHCI_QUIRK2_NO_1_8_V) {
 		host->caps1 &= ~(SDHCI_SUPPORT_SDR104 | SDHCI_SUPPORT_SDR50 |
 				 SDHCI_SUPPORT_DDR50);
+		mmc->caps2 &= ~MMC_CAP2_HS200;
 	}
 
 	/* Any UHS-I mode in caps implies SDR12 and SDR25 support. */
-- 
2.11.0