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mmc: sdhci-pci-o2micro: Bug fix for SDR104 HW tuning failure 

Force chip enter L0 power state during SDR104 HW tuning to avoid tuning failure

Signed-off-by: Shirley Her <shirley.her@bayhubtech.com>
Link: https://lore.kernel.org/r/20210206014051.3418-1-shirley.her@bayhubtech.com
Fixes: 7b7d897e88 ("mmc: sdhci-pci-o2micro: Add HW tuning for SDR104 mode")
Cc: stable@vger.kernel.org
Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
This commit is contained in:
Shirley Her 2021-02-05 17:40:51 -08:00 committed by Ulf Hansson
parent 3f957dec6d
commit 1ad9f88014
1 changed files with 20 additions and 0 deletions
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20
drivers/mmc/host/sdhci-pci-o2micro.c
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@ -33,6 +33,8 @@
#define O2_SD_ADMA2 0xE7
#define O2_SD_INF_MOD 0xF1
#define O2_SD_MISC_CTRL4 0xFC
#define O2_SD_MISC_CTRL 0x1C0
#define O2_SD_PWR_FORCE_L0 0x0002
#define O2_SD_TUNING_CTRL 0x300
#define O2_SD_PLL_SETTING 0x304
#define O2_SD_MISC_SETTING 0x308
@ -300,6 +302,8 @@ static int sdhci_o2_execute_tuning(struct mmc_host *mmc, u32 opcode)
{
struct sdhci_host *host = mmc_priv(mmc);
int current_bus_width = 0;
u32 scratch32 = 0;
u16 scratch = 0;
/*
* This handler only implements the eMMC tuning that is specific to
@ -312,6 +316,17 @@ static int sdhci_o2_execute_tuning(struct mmc_host *mmc, u32 opcode)
if (WARN_ON((opcode != MMC_SEND_TUNING_BLOCK_HS200) &&
(opcode != MMC_SEND_TUNING_BLOCK)))
return -EINVAL;
/* Force power mode enter L0 */
scratch = sdhci_readw(host, O2_SD_MISC_CTRL);
scratch |= O2_SD_PWR_FORCE_L0;
sdhci_writew(host, scratch, O2_SD_MISC_CTRL);
/* wait DLL lock, timeout value 5ms */
if (readx_poll_timeout(sdhci_o2_pll_dll_wdt_control, host,
scratch32, (scratch32 & O2_DLL_LOCK_STATUS), 1, 5000))
pr_warn("%s: DLL can't lock in 5ms after force L0 during tuning.\n",
mmc_hostname(host->mmc));
/*
* Judge the tuning reason, whether caused by dll shift
* If cause by dll shift, should call sdhci_o2_dll_recovery
@ -344,6 +359,11 @@ static int sdhci_o2_execute_tuning(struct mmc_host *mmc, u32 opcode)
sdhci_set_bus_width(host, current_bus_width);
}
/* Cancel force power mode enter L0 */
scratch = sdhci_readw(host, O2_SD_MISC_CTRL);
scratch &= ~(O2_SD_PWR_FORCE_L0);
sdhci_writew(host, scratch, O2_SD_MISC_CTRL);
sdhci_reset(host, SDHCI_RESET_CMD);
sdhci_reset(host, SDHCI_RESET_DATA);