linux-kernel - [PATCH 3/4] mmc: sdhci_am654: Disable HS400 for AM62P SR1.0 and SR1.1

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Message-ID: <20250805234950.3781367-4-jm@ti.com>
Date: Tue, 5 Aug 2025 18:49:49 -0500
From: Judith Mendez <jm@...com>
To: Judith Mendez <jm@...com>, Nishanth Menon <nm@...com>,
        Tero Kristo
	<kristo@...nel.org>, Rob Herring <robh@...nel.org>,
        Krzysztof Kozlowski
	<krzk+dt@...nel.org>,
        Conor Dooley <conor+dt@...nel.org>,
        Adrian Hunter
	<adrian.hunter@...el.com>,
        Ulf Hansson <ulf.hansson@...aro.org>
CC: Vignesh Raghavendra <vigneshr@...com>,
        Santosh Shilimkar
	<ssantosh@...nel.org>,
        <linux-arm-kernel@...ts.infradead.org>, <devicetree@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>, <linux-mmc@...r.kernel.org>
Subject: [PATCH 3/4] mmc: sdhci_am654: Disable HS400 for AM62P SR1.0 and SR1.1

This adds SDHCI_AM654_QUIRK_DISABLE_HS400 quirk which shall be used
to disable HS400 support. AM62P SR1.0 and SR1.1 do not support HS400
due to errata i2458 [0] so disable HS400 for these SoC revisions.

[0] https://www.ti.com/lit/er/sprz574a/sprz574a.pdf
Signed-off-by: Judith Mendez <jm@...com>
---
 drivers/mmc/host/sdhci_am654.c | 16 ++++++++++++++++
 1 file changed, 16 insertions(+)

diff --git a/drivers/mmc/host/sdhci_am654.c b/drivers/mmc/host/sdhci_am654.c
index e4fc345be7e5..b7d2adff3277 100644
--- a/drivers/mmc/host/sdhci_am654.c
+++ b/drivers/mmc/host/sdhci_am654.c
@@ -156,6 +156,7 @@ struct sdhci_am654_data {
 
 #define SDHCI_AM654_QUIRK_FORCE_CDTEST BIT(0)
 #define SDHCI_AM654_QUIRK_SUPPRESS_V1P8_ENA BIT(1)
+#define SDHCI_AM654_QUIRK_DISABLE_HS400 BIT(2)
 };
 
 struct window {
@@ -820,6 +821,9 @@ static int sdhci_am654_init(struct sdhci_host *host)
 	if (ret)
 		goto err_cleanup_host;
 
+	if (sdhci_am654->quirks & SDHCI_AM654_QUIRK_DISABLE_HS400)
+		host->mmc->caps2 &= ~(MMC_CAP2_HS400 | MMC_CAP2_HS400_ES);
+
 	ret = __sdhci_add_host(host);
 	if (ret)
 		goto err_cleanup_host;
@@ -883,6 +887,12 @@ static int sdhci_am654_get_of_property(struct platform_device *pdev,
 	return 0;
 }
 
+static const struct soc_device_attribute sdhci_am654_descope_hs400[] = {
+	{ .family = "AM62PX", .revision = "SR1.0" },
+	{ .family = "AM62PX", .revision = "SR1.1" },
+	{ /* sentinel */ }
+};
+
 static const struct of_device_id sdhci_am654_of_match[] = {
 	{
 		.compatible = "ti,am654-sdhci-5.1",
@@ -970,6 +980,12 @@ static int sdhci_am654_probe(struct platform_device *pdev)
 	if (ret)
 		return dev_err_probe(dev, ret, "parsing dt failed\n");
 
+	soc = soc_device_match(sdhci_am654_descope_hs400);
+	if (soc) {
+		dev_err(dev, "Disable descoped HS400 mode for this silicon revision\n");
+		sdhci_am654->quirks |= SDHCI_AM654_QUIRK_DISABLE_HS400;
+	}
+
 	host->mmc_host_ops.start_signal_voltage_switch = sdhci_am654_start_signal_voltage_switch;
 	host->mmc_host_ops.execute_tuning = sdhci_am654_execute_tuning;
 
-- 
2.49.0