From 57322d542ffe01076c9df10d38e3ec0a58f9d83a Mon Sep 17 00:00:00 2001 From: "ernest.zhang" Date: Mon, 16 Jul 2018 14:26:51 +0800 Subject: [PATCH] mmc: sdhci: Add support for O2 eMMC HS200 mode When use eMMC as boot device, the eMMC signaling voltage is tied to 1.8v fixed output voltage, bios can set o2 sd host controller PCI configuration register 0x308 bit4 to 1 to let driver skip 3.3v signaling voltage and direct use 1.8v singling voltage in eMMC initialize process. Signed-off-by: ernest.zhang Acked-by: Adrian Hunter Signed-off-by: Ulf Hansson --- drivers/mmc/host/sdhci-pci-o2micro.c | 18 ++++++++++++++++++ 1 file changed, 18 insertions(+) diff --git a/drivers/mmc/host/sdhci-pci-o2micro.c b/drivers/mmc/host/sdhci-pci-o2micro.c index 555970a..ba59db6a 100644 --- a/drivers/mmc/host/sdhci-pci-o2micro.c +++ b/drivers/mmc/host/sdhci-pci-o2micro.c @@ -3,6 +3,7 @@ * * Authors: Peter Guo * Adam Lee + * Ernest Zhang * * This software is licensed under the terms of the GNU General Public * License version 2, as published by the Free Software Foundation, and @@ -39,6 +40,7 @@ #define O2_SD_MISC_CTRL4 0xFC #define O2_SD_TUNING_CTRL 0x300 #define O2_SD_PLL_SETTING 0x304 +#define O2_SD_MISC_SETTING 0x308 #define O2_SD_CLK_SETTING 0x328 #define O2_SD_CAP_REG2 0x330 #define O2_SD_CAP_REG0 0x334 @@ -184,6 +186,7 @@ int sdhci_pci_o2_probe_slot(struct sdhci_pci_slot *slot) struct sdhci_pci_chip *chip; struct sdhci_host *host; u32 reg; + int ret; chip = slot->chip; host = slot->host; @@ -197,6 +200,21 @@ int sdhci_pci_o2_probe_slot(struct sdhci_pci_slot *slot) if (reg & 0x1) host->quirks |= SDHCI_QUIRK_MULTIBLOCK_READ_ACMD12; + if (chip->pdev->device == PCI_DEVICE_ID_O2_SEABIRD0) { + ret = pci_read_config_dword(chip->pdev, + O2_SD_MISC_SETTING, ®); + if (ret) + return -EIO; + if (reg & (1 << 4)) { + pr_info("%s: emmc 1.8v flag is set, force 1.8v signaling voltage\n", + mmc_hostname(host->mmc)); + host->flags &= ~SDHCI_SIGNALING_330; + host->flags |= SDHCI_SIGNALING_180; + host->mmc->caps2 |= MMC_CAP2_NO_SD; + host->mmc->caps2 |= MMC_CAP2_NO_SDIO; + } + } + if (chip->pdev->device != PCI_DEVICE_ID_O2_FUJIN2) break; /* set dll watch dog timer */ -- 2.7.4