mmc: sdhci-pci-gli: Reduce power consumption for GL9755

For GL9755, reduce power consumption by lowering the LFCLK and disabling
the DMACLK on low-power.

Signed-off-by: Ben Chuang <ben.chuang@genesyslogic.com.tw>
Link: https://lore.kernel.org/r/20201123053702.6083-1-benchuanggli@gmail.com
Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>

diff --git a/drivers/mmc/host/sdhci-pci-gli.c b/drivers/mmc/host/sdhci-pci-gli.c
index 9887485a41348dcec976c1257ccdc2280943ae93..f10bdfbfce364f81dfc1f8303d34ecb538f83fab 100644 (file)
--- a/drivers/mmc/host/sdhci-pci-gli.c
+++ b/drivers/mmc/host/sdhci-pci-gli.c
@@ -97,6 +97,10 @@
 #define   GLI_9755_WT_EN_ON     0x1
 #define   GLI_9755_WT_EN_OFF    0x0
 
+#define PCI_GLI_9755_PECONF   0x44
+#define   PCI_GLI_9755_LFCLK    GENMASK(14, 12)
+#define   PCI_GLI_9755_DMACLK   BIT(29)
+
 #define PCI_GLI_9755_PLL            0x64
 #define   PCI_GLI_9755_PLL_LDIV       GENMASK(9, 0)
 #define   PCI_GLI_9755_PLL_PDIV       GENMASK(14, 12)
@@ -519,6 +523,21 @@ static void sdhci_gl9755_set_clock(struct sdhci_host *host, unsigned int clock)
        sdhci_enable_clk(host, clk);
 }
 
+static void gl9755_hw_setting(struct sdhci_pci_slot *slot)
+{
+       struct pci_dev *pdev = slot->chip->pdev;
+       u32 value;
+
+       gl9755_wt_on(pdev);
+
+       pci_read_config_dword(pdev, PCI_GLI_9755_PECONF, &value);
+       value &= ~PCI_GLI_9755_LFCLK;
+       value &= ~PCI_GLI_9755_DMACLK;
+       pci_write_config_dword(pdev, PCI_GLI_9755_PECONF, value);
+
+       gl9755_wt_off(pdev);
+}
+
 static int gli_probe_slot_gl9750(struct sdhci_pci_slot *slot)
 {
        struct sdhci_host *host = slot->host;
@@ -534,6 +553,7 @@ static int gli_probe_slot_gl9755(struct sdhci_pci_slot *slot)
 {
        struct sdhci_host *host = slot->host;
 
+       gl9755_hw_setting(slot);
        gli_pcie_enable_msi(slot);
        slot->host->mmc->caps2 |= MMC_CAP2_NO_SDIO;
        sdhci_enable_v4_mode(host);