Commit 0f1d9961 authored by Ben Chuang's avatar Ben Chuang Committed by Ulf Hansson
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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: default avatarBen Chuang <ben.chuang@genesyslogic.com.tw>
Link: https://lore.kernel.org/r/20201123053702.6083-1-benchuanggli@gmail.com


Signed-off-by: default avatarUlf Hansson <ulf.hansson@linaro.org>
parent b61d468d

drivers/mmc/host/sdhci-pci-gli.c

+20 −0
Original line number Diff line number Diff line
@@ -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);