Patch "mmc: sdhci-pci-gli: A workaround to allow GL9750 to enter ASPM L1.2" has been added to the 5.15-stable tree

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This is a note to let you know that I've just added the patch titled

    mmc: sdhci-pci-gli: A workaround to allow GL9750 to enter ASPM L1.2

to the 5.15-stable tree which can be found at:
    http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary

The filename of the patch is:
     mmc-sdhci-pci-gli-a-workaround-to-allow-gl9750-to-enter-aspm-l1.2.patch
and it can be found in the queue-5.15 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.


>From d7133797e9e1b72fd89237f68cb36d745599ed86 Mon Sep 17 00:00:00 2001
From: Victor Shih <victor.shih@xxxxxxxxxxxxxxxxxxx>
Date: Tue, 12 Sep 2023 17:17:10 +0800
Subject: mmc: sdhci-pci-gli: A workaround to allow GL9750 to enter ASPM L1.2

From: Victor Shih <victor.shih@xxxxxxxxxxxxxxxxxxx>

commit d7133797e9e1b72fd89237f68cb36d745599ed86 upstream.

When GL9750 enters ASPM L1 sub-states, it will stay at L1.1 and will not
enter L1.2. The workaround is to toggle PM state to allow GL9750 to enter
ASPM L1.2.

Signed-off-by: Victor Shih <victor.shih@xxxxxxxxxxxxxxxxxxx>
Link: https://lore.kernel.org/r/20230912091710.7797-1-victorshihgli@xxxxxxxxx
Signed-off-by: Ulf Hansson <ulf.hansson@xxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
 drivers/mmc/host/sdhci-pci-gli.c |   14 ++++++++++++++
 1 file changed, 14 insertions(+)

--- a/drivers/mmc/host/sdhci-pci-gli.c
+++ b/drivers/mmc/host/sdhci-pci-gli.c
@@ -23,6 +23,9 @@
 #define   GLI_9750_WT_EN_ON	    0x1
 #define   GLI_9750_WT_EN_OFF	    0x0
 
+#define PCI_GLI_9750_PM_CTRL	0xFC
+#define   PCI_GLI_9750_PM_STATE	  GENMASK(1, 0)
+
 #define SDHCI_GLI_9750_CFG2          0x848
 #define   SDHCI_GLI_9750_CFG2_L1DLY    GENMASK(28, 24)
 #define   GLI_9750_CFG2_L1DLY_VALUE    0x1F
@@ -421,8 +424,12 @@ static void sdhci_gl9750_set_clock(struc
 
 static void gl9750_hw_setting(struct sdhci_host *host)
 {
+	struct sdhci_pci_slot *slot = sdhci_priv(host);
+	struct pci_dev *pdev;
 	u32 value;
 
+	pdev = slot->chip->pdev;
+
 	gl9750_wt_on(host);
 
 	value = sdhci_readl(host, SDHCI_GLI_9750_CFG2);
@@ -432,6 +439,13 @@ static void gl9750_hw_setting(struct sdh
 			    GLI_9750_CFG2_L1DLY_VALUE);
 	sdhci_writel(host, value, SDHCI_GLI_9750_CFG2);
 
+	/* toggle PM state to allow GL9750 to enter ASPM L1.2 */
+	pci_read_config_dword(pdev, PCI_GLI_9750_PM_CTRL, &value);
+	value |= PCI_GLI_9750_PM_STATE;
+	pci_write_config_dword(pdev, PCI_GLI_9750_PM_CTRL, value);
+	value &= ~PCI_GLI_9750_PM_STATE;
+	pci_write_config_dword(pdev, PCI_GLI_9750_PM_CTRL, value);
+
 	gl9750_wt_off(host);
 }
 


Patches currently in stable-queue which might be from victor.shih@xxxxxxxxxxxxxxxxxxx are

queue-5.15/mmc-sdhci-pci-gli-a-workaround-to-allow-gl9750-to-enter-aspm-l1.2.patch



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