From f46b54cc72bd71d1b2e620bfa00a95837078261f Mon Sep 17 00:00:00 2001 From: Renius Chen Date: Thu, 25 Feb 2021 19:13:07 +0800 Subject: [PATCH] mmc: sdhci-pci-gli: Enable short circuit protection mechanism of GL9755 Short circuit protection mechanism of GL9755 is disabled by HW default setting. Enable short circuit protection to prevent GL9755 from being damaged by short circuit or over current. Signed-off-by: Renius Chen Link: https://lore.kernel.org/r/20210225111307.62975-1-reniuschengl@gmail.com Signed-off-by: Ulf Hansson --- drivers/mmc/host/sdhci-pci-gli.c | 8 ++++++++ 1 file changed, 8 insertions(+) diff --git a/drivers/mmc/host/sdhci-pci-gli.c b/drivers/mmc/host/sdhci-pci-gli.c index 4a0f69b97a78f..fd0939355584a 100644 --- a/drivers/mmc/host/sdhci-pci-gli.c +++ b/drivers/mmc/host/sdhci-pci-gli.c @@ -123,6 +123,9 @@ #define PCI_GLI_9755_PLLSSC 0x68 #define PCI_GLI_9755_PLLSSC_PPM GENMASK(15, 0) +#define PCI_GLI_9755_SerDes 0x70 +#define PCI_GLI_9755_SCP_DIS BIT(19) + #define GLI_MAX_TUNING_LOOP 40 /* Genesys Logic chipset */ @@ -547,6 +550,11 @@ static void gl9755_hw_setting(struct sdhci_pci_slot *slot) value &= ~PCI_GLI_9755_DMACLK; pci_write_config_dword(pdev, PCI_GLI_9755_PECONF, value); + /* enable short circuit protection */ + pci_read_config_dword(pdev, PCI_GLI_9755_SerDes, &value); + value &= ~PCI_GLI_9755_SCP_DIS; + pci_write_config_dword(pdev, PCI_GLI_9755_SerDes, value); + gl9755_wt_off(pdev); } -- 2.30.2