mmc: sdhci-pci-gli: Use pci_set_power_state(), not direct PMCSR writes

d713379 ("mmc: sdhci-pci-gli: A workaround to allow GL9750 to enter
ASPM L1.2") and 36ed2fd ("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 d713379 and
36ed2fd did not.

Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
Reviewed-by: Ben Chuang <ben.chuang@genesyslogic.com.tw>
Link: https://lore.kernel.org/r/20240327214831.1544595-3-helgaas@kernel.org
Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>

Author: bjorn-helgaas

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);