linux-kernel - [PATCH 2/2] mmc: sdhci-pci-gli: Use pci_set_power

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Date: Wed, 27 Mar 2024 16:48:31 -0500
From: Bjorn Helgaas <helgaas@...nel.org>
To: Adrian Hunter <adrian.hunter@...el.com>,
	Ulf Hansson <ulf.hansson@...aro.org>,
	Victor Shih <victor.shih@...esyslogic.com.tw>,
	Ben Chuang <ben.chuang@...esyslogic.com.tw>
Cc: Kai-Heng Feng <kai.heng.geng@...onical.com>,
	Sven van Ashbrook <svenva@...omium.org>,
	Stanislaw Kardach <skardach@...gle.com>,
	Brian Norris <briannorris@...omium.org>,
	Jason Lai <jasonlai.genesyslogic@...il.com>,
	Renius Chen <reniuschengl@...il.com>,
	linux-pci@...r.kernel.org,
	linux-mmc@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	Bjorn Helgaas <bhelgaas@...gle.com>
Subject: [PATCH 2/2] mmc: sdhci-pci-gli: Use pci_set_power_state(), not direct PMCSR writes

From: Bjorn Helgaas <bhelgaas@...gle.com>

d7133797e9e1 ("mmc: sdhci-pci-gli: A workaround to allow GL9750 to enter
ASPM L1.2") and 36ed2fd32b2c ("mmc: sdhci-pci-gli: A workaround to allow
GL9755 to enter ASPM L1.2") added writes to the Control register in the
Power Management Capability to put the device in D3hot and back to D0.

Use the pci_set_power_state() interface instead because these are generic
operations that don't need to be driver-specific.  Also, the PCI spec
requires some delays after these power transitions, and
pci_set_power_state() takes care of those, while d7133797e9e1 and
36ed2fd32b2c did not.

Signed-off-by: Bjorn Helgaas <bhelgaas@...gle.com>
---
 drivers/mmc/host/sdhci-pci-gli.c | 20 ++++----------------
 1 file changed, 4 insertions(+), 16 deletions(-)

diff --git a/drivers/mmc/host/sdhci-pci-gli.c b/drivers/mmc/host/sdhci-pci-gli.c
index 3d5543581537..0f81586a19df 100644
--- a/drivers/mmc/host/sdhci-pci-gli.c
+++ b/drivers/mmc/host/sdhci-pci-gli.c
@@ -25,9 +25,6 @@
 #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
@@ -149,9 +146,6 @@
 #define PCI_GLI_9755_MISC	    0x78
 #define   PCI_GLI_9755_MISC_SSC_OFF    BIT(26)
 
-#define PCI_GLI_9755_PM_CTRL     0xFC
-#define   PCI_GLI_9755_PM_STATE    GENMASK(1, 0)
-
 #define SDHCI_GLI_9767_GM_BURST_SIZE			0x510
 #define   SDHCI_GLI_9767_GM_BURST_SIZE_AXI_ALWAYS_SET	  BIT(8)
 
@@ -556,11 +550,8 @@ static void gl9750_hw_setting(struct sdhci_host *host)
 	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);
+	pci_set_power_state(pdev, PCI_D3hot);
+	pci_set_power_state(pdev, PCI_D0);
 
 	/* mask the replay timer timeout of AER */
 	aer = pci_find_ext_capability(pdev, PCI_EXT_CAP_ID_ERR);
@@ -774,11 +765,8 @@ static void gl9755_hw_setting(struct sdhci_pci_slot *slot)
 	pci_write_config_dword(pdev, PCI_GLI_9755_CFG2, value);
 
 	/* toggle PM state to allow GL9755 to enter ASPM L1.2 */
-	pci_read_config_dword(pdev, PCI_GLI_9755_PM_CTRL, &value);
-	value |= PCI_GLI_9755_PM_STATE;
-	pci_write_config_dword(pdev, PCI_GLI_9755_PM_CTRL, value);
-	value &= ~PCI_GLI_9755_PM_STATE;
-	pci_write_config_dword(pdev, PCI_GLI_9755_PM_CTRL, value);
+	pci_set_power_state(pdev, PCI_D3hot);
+	pci_set_power_state(pdev, PCI_D0);
 
 	/* mask the replay timer timeout of AER */
 	aer = pci_find_ext_capability(pdev, PCI_EXT_CAP_ID_ERR);
-- 
2.34.1