linux-kernel - [PATCH v2 3/3] mmc: sdhci-pci-gli: GL9767: Fix initializing the UHS-II interface during a power-on

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Message-ID: <eb3ac2d225b169f72a0ad33fd1754cabf254335a.1757056421.git.benchuanggli@gmail.com>
Date: Fri,  5 Sep 2025 16:00:56 +0800
From: Ben Chuang <benchuanggli@...il.com>
To: adrian.hunter@...el.com,
	ulf.hansson@...aro.org
Cc: victor.shih@...esyslogic.com.tw,
	ben.chuang@...esyslogic.com.tw,
	HL.Liu@...esyslogic.com.tw,
	SeanHY.Chen@...esyslogic.com.tw,
	benchuanggli@...il.com,
	victorshihgli@...il.com,
	linux-mmc@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	stable@...r.kernel.org
Subject: [PATCH v2 3/3] mmc: sdhci-pci-gli: GL9767: Fix initializing the UHS-II interface during a power-on

From: Ben Chuang <ben.chuang@...esyslogic.com.tw>

According to the power structure of IC hardware design for UHS-II
interface, reset control and timing must be added to the initialization
process of powering on the UHS-II interface.

Fixes: 27dd3b82557a ("mmc: sdhci-pci-gli: enable UHS-II mode for GL9767")
Cc: stable@...r.kernel.org # v6.13+
Signed-off-by: Ben Chuang <ben.chuang@...esyslogic.com.tw>
---
v2:
 * use sdhci_gl9767_uhs2_phy_reset() instead of
   sdhci_gl9767_uhs2_phy_reset_assert() and sdhci_gl9767_uhs2_phy_reset_deassert()
 * add comments for set/clean PCIE_GLI_9767_UHS2_CTL2_FORCE_RESETN and
   PCIE_GLI_9767_UHS2_CTL2_FORCE_PHY_RESETN_VALUE
 * use usleep_range() instead of mdelay()

v1:
 * https://lore.kernel.org/all/20250901094224.3920-1-benchuanggli@gmail.com/
---
 drivers/mmc/host/sdhci-pci-gli.c | 68 +++++++++++++++++++++++++++++++-
 1 file changed, 67 insertions(+), 1 deletion(-)

diff --git a/drivers/mmc/host/sdhci-pci-gli.c b/drivers/mmc/host/sdhci-pci-gli.c
index 3a1de477e9af..b0f91cc9e40e 100644
--- a/drivers/mmc/host/sdhci-pci-gli.c
+++ b/drivers/mmc/host/sdhci-pci-gli.c
@@ -283,6 +283,8 @@
 #define   PCIE_GLI_9767_UHS2_CTL2_ZC_VALUE	  0xb
 #define   PCIE_GLI_9767_UHS2_CTL2_ZC_CTL	  BIT(6)
 #define   PCIE_GLI_9767_UHS2_CTL2_ZC_CTL_VALUE	  0x1
+#define   PCIE_GLI_9767_UHS2_CTL2_FORCE_PHY_RESETN	BIT(13)
+#define   PCIE_GLI_9767_UHS2_CTL2_FORCE_RESETN_VALUE	BIT(14)
 
 #define GLI_MAX_TUNING_LOOP 40
 
@@ -1179,6 +1181,65 @@ static void gl9767_set_low_power_negotiation(struct pci_dev *pdev, bool enable)
 	gl9767_vhs_read(pdev);
 }
 
+static void sdhci_gl9767_uhs2_phy_reset(struct sdhci_host *host, bool assert)
+{
+	struct sdhci_pci_slot *slot = sdhci_priv(host);
+	struct pci_dev *pdev = slot->chip->pdev;
+	u32 value, set, clr;
+
+	if (assert) {
+		/* Assert reset, set RESETN and clean RESETN_VALUE */
+		set = PCIE_GLI_9767_UHS2_CTL2_FORCE_PHY_RESETN;
+		clr = PCIE_GLI_9767_UHS2_CTL2_FORCE_RESETN_VALUE;
+	} else {
+		/* De-assert reset, clean RESETN and set RESETN_VALUE */
+		set = PCIE_GLI_9767_UHS2_CTL2_FORCE_RESETN_VALUE;
+		clr = PCIE_GLI_9767_UHS2_CTL2_FORCE_PHY_RESETN;
+	}
+
+	gl9767_vhs_write(pdev);
+	pci_read_config_dword(pdev, PCIE_GLI_9767_UHS2_CTL2, &value);
+	value |= set;
+	pci_write_config_dword(pdev, PCIE_GLI_9767_UHS2_CTL2, value);
+	value &= ~clr;
+	pci_write_config_dword(pdev, PCIE_GLI_9767_UHS2_CTL2, value);
+	gl9767_vhs_read(pdev);
+}
+
+static void __gl9767_uhs2_set_power(struct sdhci_host *host, unsigned char mode, unsigned short vdd)
+{
+	u8 pwr = 0;
+
+	if (mode != MMC_POWER_OFF) {
+		pwr = sdhci_get_vdd_value(vdd);
+		if (!pwr)
+			WARN(1, "%s: Invalid vdd %#x\n",
+			     mmc_hostname(host->mmc), vdd);
+		pwr |= SDHCI_VDD2_POWER_180;
+	}
+
+	if (host->pwr == pwr)
+		return;
+
+	host->pwr = pwr;
+
+	if (pwr == 0) {
+		sdhci_writeb(host, 0, SDHCI_POWER_CONTROL);
+	} else {
+		sdhci_writeb(host, 0, SDHCI_POWER_CONTROL);
+
+		pwr |= SDHCI_POWER_ON;
+		sdhci_writeb(host, pwr & 0xf, SDHCI_POWER_CONTROL);
+		usleep_range(5000, 6250);
+
+		/* Assert reset */
+		sdhci_gl9767_uhs2_phy_reset(host, true);
+		pwr |= SDHCI_VDD2_POWER_ON;
+		sdhci_writeb(host, pwr, SDHCI_POWER_CONTROL);
+		usleep_range(5000, 6250);
+	}
+}
+
 static void sdhci_gl9767_set_clock(struct sdhci_host *host, unsigned int clock)
 {
 	struct sdhci_pci_slot *slot = sdhci_priv(host);
@@ -1205,6 +1266,11 @@ static void sdhci_gl9767_set_clock(struct sdhci_host *host, unsigned int clock)
 	}
 
 	sdhci_enable_clk(host, clk);
+
+	if (mmc_card_uhs2(host->mmc))
+		/* De-assert reset */
+		sdhci_gl9767_uhs2_phy_reset(host, false);
+
 	gl9767_set_low_power_negotiation(pdev, true);
 }
 
@@ -1476,7 +1542,7 @@ static void sdhci_gl9767_set_power(struct sdhci_host *host, unsigned char mode,
 		gl9767_vhs_read(pdev);
 
 		sdhci_gli_overcurrent_event_enable(host, false);
-		sdhci_uhs2_set_power(host, mode, vdd);
+		__gl9767_uhs2_set_power(host, mode, vdd);
 		sdhci_gli_overcurrent_event_enable(host, true);
 	} else {
 		gl9767_vhs_write(pdev);
-- 
2.51.0