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mmc: sdhci-pci-o2micro: Fix a warm reboot issue that disk can't be detected by BIOS

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Driver shall switch clock source from DLL clock to
OPE clock when power off card to ensure that card
can be identified with OPE clock by BIOS.

Signed-off-by: Fred Ai <fred.ai@bayhubtech.com>
Fixes:4be33cf18703 ("mmc: sdhci-pci-o2micro: Improve card input timing at SDR104/HS200 mode")
Cc: stable@vger.kernel.org
Link: https://lore.kernel.org/r/20240203102908.4683-1-fredaibayhubtech@126.com
Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
This commit is contained in:
Fred Ai 2024-02-03 02:29:08 -08:00 committed by Ulf Hansson
parent 41bccc98fb
commit 58aeb5623c
1 changed files with 30 additions and 0 deletions
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30
drivers/mmc/host/sdhci-pci-o2micro.c
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@ -693,6 +693,35 @@ static int sdhci_pci_o2_init_sd_express(struct mmc_host *mmc, struct mmc_ios *io
return 0;
}
static void sdhci_pci_o2_set_power(struct sdhci_host *host, unsigned char mode, unsigned short vdd)
{
struct sdhci_pci_chip *chip;
struct sdhci_pci_slot *slot = sdhci_priv(host);
u32 scratch_32 = 0;
u8 scratch_8 = 0;
chip = slot->chip;
if (mode == MMC_POWER_OFF) {
/* UnLock WP */
pci_read_config_byte(chip->pdev, O2_SD_LOCK_WP, &scratch_8);
scratch_8 &= 0x7f;
pci_write_config_byte(chip->pdev, O2_SD_LOCK_WP, scratch_8);
/* Set PCR 0x354[16] to switch Clock Source back to OPE Clock */
pci_read_config_dword(chip->pdev, O2_SD_OUTPUT_CLK_SOURCE_SWITCH, &scratch_32);
scratch_32 &= ~(O2_SD_SEL_DLL);
pci_write_config_dword(chip->pdev, O2_SD_OUTPUT_CLK_SOURCE_SWITCH, scratch_32);
/* Lock WP */
pci_read_config_byte(chip->pdev, O2_SD_LOCK_WP, &scratch_8);
scratch_8 |= 0x80;
pci_write_config_byte(chip->pdev, O2_SD_LOCK_WP, scratch_8);
}
sdhci_set_power(host, mode, vdd);
}
static int sdhci_pci_o2_probe_slot(struct sdhci_pci_slot *slot)
{
struct sdhci_pci_chip *chip;
@ -1051,6 +1080,7 @@ static const struct sdhci_ops sdhci_pci_o2_ops = {
.set_bus_width = sdhci_set_bus_width,
.reset = sdhci_reset,
.set_uhs_signaling = sdhci_set_uhs_signaling,
.set_power = sdhci_pci_o2_set_power,
};
const struct sdhci_pci_fixes sdhci_o2 = {