linux-kernel - [PATCH 2/3] mmc: sdhci-brcmstb: clear CFG_OP

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Message-Id: <20251002210426.2490368-3-kamal.dasu@broadcom.com>
Date: Thu,  2 Oct 2025 17:04:25 -0400
From: Kamal Dasu <kamal.dasu@...adcom.com>
To: andersson@...nel.org,
	robh@...nel.org,
	krzk+dt@...nel.org,
	conor+dt@...nel.org,
	florian.fainelli@...adcom.com,
	ulf.hansson@...aro.org,
	adrian.hunter@...el.com
Cc: bcm-kernel-feedback-list@...adcom.com,
	devicetree@...r.kernel.org,
	linux-arm-kernel@...ts.infradead.org,
	linux-kernel@...r.kernel.org,
	linux-mmc@...r.kernel.org,
	Kamal Dasu <kamal.dasu@...adcom.com>
Subject: [PATCH 2/3] mmc: sdhci-brcmstb: clear CFG_OP_DLY when using HS200

Clear SDIO_1_CFG_OP_DLY register when using HS200 mode to be
compliant with timing spec.  We only need this for on BCM72116
SoCs.

Signed-off-by: Kamal Dasu <kamal.dasu@...adcom.com>
---
 drivers/mmc/host/sdhci-brcmstb.c | 37 ++++++++++++++++++++++++++++----
 1 file changed, 33 insertions(+), 4 deletions(-)

diff --git a/drivers/mmc/host/sdhci-brcmstb.c b/drivers/mmc/host/sdhci-brcmstb.c
index efc2f3bdc631..0905b316a24b 100644
--- a/drivers/mmc/host/sdhci-brcmstb.c
+++ b/drivers/mmc/host/sdhci-brcmstb.c
@@ -31,13 +31,13 @@
 
 #define SDHCI_ARASAN_CQE_BASE_ADDR		0x200
 
-#define SDIO_CFG_CQ_CAPABILITY			0x4c
-#define SDIO_CFG_CQ_CAPABILITY_FMUL		GENMASK(13, 12)
-
 #define SDIO_CFG_CTRL				0x0
 #define SDIO_CFG_CTRL_SDCD_N_TEST_EN		BIT(31)
 #define SDIO_CFG_CTRL_SDCD_N_TEST_LEV		BIT(30)
-
+#define SDIO_CFG_OP_DLY				0x34
+#define SDIO_CFG_OP_DLY_DEFAULT			0x80000003
+#define SDIO_CFG_CQ_CAPABILITY			0x4c
+#define SDIO_CFG_CQ_CAPABILITY_FMUL		GENMASK(13, 12)
 #define SDIO_CFG_MAX_50MHZ_MODE			0x1ac
 #define SDIO_CFG_MAX_50MHZ_MODE_STRAP_OVERRIDE	BIT(31)
 #define SDIO_CFG_MAX_50MHZ_MODE_ENABLE		BIT(0)
@@ -212,6 +212,22 @@ static void sdhci_brcmstb_cfginit_2712(struct sdhci_host *host)
 	}
 }
 
+static void sdhci_brcmstb_set_72116_uhs_signaling(struct sdhci_host *host,
+						unsigned int timing)
+{
+	struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);
+	struct sdhci_brcmstb_priv *priv = sdhci_pltfm_priv(pltfm_host);
+	u32 reg;
+
+	/* no change to SDIO_CFG_OP_DLY_DEFAULT when using preset clk rate */
+	if (!(host->quirks2 & SDHCI_QUIRK2_PRESET_VALUE_BROKEN))
+		return;
+
+	reg = (timing == MMC_TIMING_MMC_HS200) ? 0 : SDIO_CFG_OP_DLY_DEFAULT;
+	writel(reg, priv->cfg_regs + SDIO_CFG_OP_DLY);
+	sdhci_set_uhs_signaling(host, timing);
+}
+
 static void sdhci_brcmstb_dumpregs(struct mmc_host *mmc)
 {
 	sdhci_dumpregs(mmc_priv(mmc));
@@ -252,6 +268,13 @@ static struct sdhci_ops sdhci_brcmstb_ops_2712 = {
 	.set_uhs_signaling = sdhci_set_uhs_signaling,
 };
 
+static struct sdhci_ops sdhci_brcmstb_ops_72116 = {
+	.set_clock = sdhci_set_clock,
+	.set_bus_width = sdhci_set_bus_width,
+	.reset = sdhci_reset,
+	.set_uhs_signaling = sdhci_brcmstb_set_72116_uhs_signaling,
+};
+
 static struct sdhci_ops sdhci_brcmstb_ops_7216 = {
 	.set_clock = sdhci_brcmstb_set_clock,
 	.set_bus_width = sdhci_set_bus_width,
@@ -282,6 +305,11 @@ static struct brcmstb_match_priv match_priv_7445 = {
 	.ops = &sdhci_brcmstb_ops,
 };
 
+static struct brcmstb_match_priv match_priv_72116 = {
+	.flags = BRCMSTB_MATCH_FLAGS_BROKEN_TIMEOUT,
+	.ops = &sdhci_brcmstb_ops_72116,
+};
+
 static const struct brcmstb_match_priv match_priv_7216 = {
 	.flags = BRCMSTB_MATCH_FLAGS_HAS_CLOCK_GATE,
 	.hs400es = sdhci_brcmstb_hs400es,
@@ -298,6 +326,7 @@ static const struct of_device_id __maybe_unused sdhci_brcm_of_match[] = {
 	{ .compatible = "brcm,bcm2712-sdhci", .data = &match_priv_2712 },
 	{ .compatible = "brcm,bcm7425-sdhci", .data = &match_priv_7425 },
 	{ .compatible = "brcm,bcm7445-sdhci", .data = &match_priv_7445 },
+	{ .compatible = "brcm,bcm72116-sdhci", .data = &match_priv_72116 },
 	{ .compatible = "brcm,bcm7216-sdhci", .data = &match_priv_7216 },
 	{ .compatible = "brcm,bcm74165b0-sdhci", .data = &match_priv_74165b0 },
 	{},
-- 
2.34.1