linux-kernel - [PATCH V2] mmc: sdhci-pci-gli: GL975[05]: Mask the replay timer timeout of AER

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Message-Id: <20231018103337.34622-1-victorshihgli@gmail.com>
Date:   Wed, 18 Oct 2023 18:33:37 +0800
From:   Victor Shih <victorshihgli@...il.com>
To:     ulf.hansson@...aro.org, adrian.hunter@...el.com
Cc:     linux-mmc@...r.kernel.org, linux-kernel@...r.kernel.org,
        benchuanggli@...il.com, HL.Liu@...esyslogic.com.tw,
        Greg.tu@...esyslogic.com.tw, SeanHY.Chen@...esyslogic.com.tw,
        kai.heng.feng@...onical.com, Victor Shih <victorshihgli@...il.com>,
        Victor Shih <victor.shih@...esyslogic.com.tw>
Subject: [PATCH V2] mmc: sdhci-pci-gli: GL975[05]: Mask the replay timer timeout of AER

From: Victor Shih <victor.shih@...esyslogic.com.tw>

Due to a flaw in the hardware design, the GL975x replay timer frequently
times out when ASPM is enabled. As a result, the warning messages that will
often appear in the system log when the system accesses the GL975x
PCI config. Therefore, the replay timer timeout must be masked.

Signed-off-by: Victor Shih <victor.shih@...esyslogic.com.tw>
---

Updates in V2:
 - Modify the commit message.

---

 drivers/mmc/host/sdhci-pci-gli.c | 16 ++++++++++++++++
 1 file changed, 16 insertions(+)

diff --git a/drivers/mmc/host/sdhci-pci-gli.c b/drivers/mmc/host/sdhci-pci-gli.c
index d83261e857a5..d8a991b349a8 100644
--- a/drivers/mmc/host/sdhci-pci-gli.c
+++ b/drivers/mmc/host/sdhci-pci-gli.c
@@ -28,6 +28,9 @@
 #define PCI_GLI_9750_PM_CTRL	0xFC
 #define   PCI_GLI_9750_PM_STATE	  GENMASK(1, 0)
 
+#define PCI_GLI_9750_CORRERR_MASK				0x214
+#define   PCI_GLI_9750_CORRERR_MASK_REPLAY_TIMER_TIMEOUT	  BIT(12)
+
 #define SDHCI_GLI_9750_CFG2          0x848
 #define   SDHCI_GLI_9750_CFG2_L1DLY    GENMASK(28, 24)
 #define   GLI_9750_CFG2_L1DLY_VALUE    0x1F
@@ -152,6 +155,9 @@
 #define PCI_GLI_9755_PM_CTRL     0xFC
 #define   PCI_GLI_9755_PM_STATE    GENMASK(1, 0)
 
+#define PCI_GLI_9755_CORRERR_MASK				0x214
+#define   PCI_GLI_9755_CORRERR_MASK_REPLAY_TIMER_TIMEOUT	  BIT(12)
+
 #define SDHCI_GLI_9767_GM_BURST_SIZE			0x510
 #define   SDHCI_GLI_9767_GM_BURST_SIZE_AXI_ALWAYS_SET	  BIT(8)
 
@@ -561,6 +567,11 @@ static void gl9750_hw_setting(struct sdhci_host *host)
 	value &= ~PCI_GLI_9750_PM_STATE;
 	pci_write_config_dword(pdev, PCI_GLI_9750_PM_CTRL, value);
 
+	/* mask the replay timer timeout of AER */
+	pci_read_config_dword(pdev, PCI_GLI_9750_CORRERR_MASK, &value);
+	value |= PCI_GLI_9750_CORRERR_MASK_REPLAY_TIMER_TIMEOUT;
+	pci_write_config_dword(pdev, PCI_GLI_9750_CORRERR_MASK, value);
+
 	gl9750_wt_off(host);
 }
 
@@ -770,6 +781,11 @@ static void gl9755_hw_setting(struct sdhci_pci_slot *slot)
 	value &= ~PCI_GLI_9755_PM_STATE;
 	pci_write_config_dword(pdev, PCI_GLI_9755_PM_CTRL, value);
 
+	/* mask the replay timer timeout of AER */
+	pci_read_config_dword(pdev, PCI_GLI_9755_CORRERR_MASK, &value);
+	value |= PCI_GLI_9755_CORRERR_MASK_REPLAY_TIMER_TIMEOUT;
+	pci_write_config_dword(pdev, PCI_GLI_9755_CORRERR_MASK, value);
+
 	gl9755_wt_off(pdev);
 }
 
-- 
2.25.1