linux-kernel - [PATCH v3 3/3] mmc: sdhci-of-aspeed: add inversion signal presence

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Message-ID: <20191118104646.3838-4-i.mikhaylov@yadro.com>
Date:   Mon, 18 Nov 2019 13:46:46 +0300
From:   Ivan Mikhaylov <i.mikhaylov@...ro.com>
To:     unlisted-recipients:; (no To-header on input)
CC:     Ivan Mikhaylov <i.mikhaylov@...ro.com>,
        Joel Stanley <joel@....id.au>,
        Andrew Jeffery <andrew@...id.au>,
        Rob Herring <robh+dt@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        Adrian Hunter <adrian.hunter@...el.com>,
        Ulf Hansson <ulf.hansson@...aro.org>,
        <devicetree@...r.kernel.org>,
        <linux-arm-kernel@...ts.infradead.org>,
        <linux-aspeed@...ts.ozlabs.org>, <linux-kernel@...r.kernel.org>,
        <linux-mmc@...r.kernel.org>, <openbmc@...ts.ozlabs.org>
Subject: [PATCH v3 3/3] mmc: sdhci-of-aspeed: add inversion signal presence

Add read_l callback in sdhci_ops with flipping of SDHCI_CARD_PRESENT
bit in case of inverted card detection signal.

Signed-off-by: Ivan Mikhaylov <i.mikhaylov@...ro.com>

diff --git a/drivers/mmc/host/sdhci-of-aspeed.c b/drivers/mmc/host/sdhci-of-aspeed.c
index 8962f6664381..56912e30c47e 100644
--- a/drivers/mmc/host/sdhci-of-aspeed.c
+++ b/drivers/mmc/host/sdhci-of-aspeed.c
@@ -111,7 +111,19 @@ static void aspeed_sdhci_set_bus_width(struct sdhci_host *host, int width)
 	sdhci_writeb(host, ctrl, SDHCI_HOST_CONTROL);
 }
 
+static u32 aspeed_sdhci_readl(struct sdhci_host *host, int reg)
+{
+	u32 val = readl(host->ioaddr + reg);
+
+	if (unlikely(reg == SDHCI_PRESENT_STATE) &&
+	    (host->mmc->caps2 & MMC_CAP2_CD_ACTIVE_HIGH))
+		val ^= SDHCI_CARD_PRESENT;
+
+	return val;
+}
+
 static const struct sdhci_ops aspeed_sdhci_ops = {
+	.read_l = aspeed_sdhci_readl,
 	.set_clock = aspeed_sdhci_set_clock,
 	.get_max_clock = aspeed_sdhci_get_max_clock,
 	.set_bus_width = aspeed_sdhci_set_bus_width,
-- 
2.20.1