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Subject[PATCH V2 1/1] mmc: sdhci: Fix O2 Host data read/write DLL lock Phase shift issue
Date
Fix data read/write error in HS200 mode due to chip DLL lock phase shift

Signed-off-by:Shirley Her<shirley.her@bayhubtech.com>
---
change in V2:
1. Use usleep_range instead of udelay
2. move dll_adjust_count to sdhci-pci-o2micro.c

change in V1:
1. Add error recovery function to relock the DLL with correct phase
2. Retuning HS200 after DLL locked
---
---
drivers/mmc/host/sdhci-pci-o2micro.c | 157 +++++++++++++++++++++++++++++------
1 file changed, 133 insertions(+), 24 deletions(-)

diff --git a/drivers/mmc/host/sdhci-pci-o2micro.c b/drivers/mmc/host/sdhci-pci-o2micro.c
index 9dc4548..c43b2ce 100644
--- a/drivers/mmc/host/sdhci-pci-o2micro.c
+++ b/drivers/mmc/host/sdhci-pci-o2micro.c
@@ -51,13 +51,60 @@
#define O2_SD_VENDOR_SETTING2 0x1C8
#define O2_SD_HW_TUNING_DISABLE BIT(4)

-#define O2_PLL_WDT_CONTROL1 0x1CC
+#define O2_PLL_DLL_WDT_CONTROL1 0x1CC
#define O2_PLL_FORCE_ACTIVE BIT(18)
#define O2_PLL_LOCK_STATUS BIT(14)
#define O2_PLL_SOFT_RESET BIT(12)
+#define O2_DLL_LOCK_STATUS BIT(11)

#define O2_SD_DETECT_SETTING 0x324

+static const u32 dmdn_table[5] = {0x25100000, 0x2B1C0000,
+ 0x2C1A0000, 0x371B0000, 0x35100000};
+static u8 dll_adjust_count;
+static int sdhci_o2_get_cd(struct mmc_host *mmc);
+
+static void o2_pci_set_baseclk(struct sdhci_pci_chip *chip, u32 value)
+{
+ u32 scratch_32;
+
+ pci_read_config_dword(chip->pdev,
+ O2_SD_PLL_SETTING, &scratch_32);
+
+ scratch_32 &= 0x0000FFFF;
+ scratch_32 |= value;
+
+ pci_write_config_dword(chip->pdev,
+ O2_SD_PLL_SETTING, scratch_32);
+}
+
+static int sdhci_o2_wait_dll_detect_lock(struct sdhci_host *host)
+{
+ ktime_t timeout;
+ u32 scratch32;
+
+ usleep_range(5000, 6000);
+ scratch32 = sdhci_readl(host, O2_PLL_DLL_WDT_CONTROL1);
+ if (!(scratch32 & O2_DLL_LOCK_STATUS)) {
+ pr_warn("%s: DLL is still unlocked after wait 5ms\n",
+ mmc_hostname(host->mmc));
+ }
+
+ /* Detect 500 ms */
+ timeout = ktime_add_ms(ktime_get(), 500);
+ while (1) {
+ bool timedout = ktime_after(ktime_get(), timeout);
+
+ scratch32 = sdhci_readl(host, O2_PLL_DLL_WDT_CONTROL1);
+ if (!(scratch32 & O2_DLL_LOCK_STATUS))
+ return 0;
+
+ if (timedout)
+ return 1;
+ usleep_range(10, 1000);
+ }
+}
+
static void sdhci_o2_set_tuning_mode(struct sdhci_host *host)
{
u16 reg;
@@ -95,11 +142,85 @@ static void __sdhci_o2_execute_tuning(struct sdhci_host *host, u32 opcode)
sdhci_reset_tuning(host);
}

+static int sdhci_o2_error_recovery(struct sdhci_pci_chip *chip,
+ struct sdhci_host *host)
+{
+ int ret = 0;
+ u8 scratch_8 = 0;
+ u32 scratch_32 = 0;
+ /* Disable clock */
+ sdhci_writeb(host, 0, SDHCI_CLOCK_CONTROL);
+
+DLL_ADJUST:
+ if (dll_adjust_count >= 5) {
+ dll_adjust_count = 4;
+ pr_warn("%s: error recovery failed with the dll_adjust_count over max value.\n",
+ mmc_hostname(host->mmc));
+ }
+
+ /* UnLock WP */
+ ret = pci_read_config_byte(chip->pdev,
+ O2_SD_LOCK_WP, &scratch_8);
+ if (ret)
+ return ret;
+
+ scratch_8 &= 0x7f;
+ pci_write_config_byte(chip->pdev, O2_SD_LOCK_WP, scratch_8);
+
+ /* PLL software reset */
+ scratch_32 = sdhci_readl(host, O2_PLL_DLL_WDT_CONTROL1);
+ scratch_32 |= O2_PLL_SOFT_RESET;
+ sdhci_writel(host, scratch_32, O2_PLL_DLL_WDT_CONTROL1);
+
+ ret = pci_read_config_dword(chip->pdev,
+ O2_SD_FUNC_REG4,
+ &scratch_32);
+ /* Enable Base Clk setting change */
+ scratch_32 |= O2_SD_FREG4_ENABLE_CLK_SET;
+ pci_write_config_dword(chip->pdev, O2_SD_FUNC_REG4, scratch_32);
+ o2_pci_set_baseclk(chip, dmdn_table[dll_adjust_count]);
+
+
+ /* Enable internal clock */
+ scratch_8 = SDHCI_CLOCK_INT_EN;
+ sdhci_writeb(host, scratch_8, SDHCI_CLOCK_CONTROL);
+
+ if (sdhci_o2_get_cd(host->mmc)) {
+ if (sdhci_o2_wait_dll_detect_lock(host)) {
+ scratch_8 |= SDHCI_CLOCK_CARD_EN;
+ sdhci_writeb(host, scratch_8, SDHCI_CLOCK_CONTROL);
+ ret = 1;
+ } else {
+
+ pr_warn("%s: DLL unlocked when dll_adjust_count is %d.\n",
+ mmc_hostname(host->mmc), dll_adjust_count);
+ dll_adjust_count++;
+ goto DLL_ADJUST;
+ }
+ } else
+ goto DLL_ADJUST;
+
+ /* Lock WP */
+ ret = pci_read_config_byte(chip->pdev,
+ O2_SD_LOCK_WP, &scratch_8);
+ if (ret)
+ return ret;
+ scratch_8 |= 0x80;
+ pci_write_config_byte(chip->pdev, O2_SD_LOCK_WP, scratch_8);
+ return ret;
+}
+
static int sdhci_o2_execute_tuning(struct mmc_host *mmc, u32 opcode)
{
struct sdhci_host *host = mmc_priv(mmc);
+ struct sdhci_pci_slot *slot = sdhci_priv(host);
int current_bus_width = 0;

+
+ if (dll_adjust_count)
+ sdhci_o2_error_recovery(slot->chip, host);
+
+ dll_adjust_count++;
/*
* This handler only implements the eMMC tuning that is specific to
* this controller. Fall back to the standard method for other TIMING.
@@ -131,23 +252,11 @@ static int sdhci_o2_execute_tuning(struct mmc_host *mmc, u32 opcode)
mmc->ios.bus_width = MMC_BUS_WIDTH_8;
sdhci_set_bus_width(host, current_bus_width);
}
-
host->flags &= ~SDHCI_HS400_TUNING;
return 0;
}

-static void o2_pci_set_baseclk(struct sdhci_pci_chip *chip, u32 value)
-{
- u32 scratch_32;
- pci_read_config_dword(chip->pdev,
- O2_SD_PLL_SETTING, &scratch_32);

- scratch_32 &= 0x0000FFFF;
- scratch_32 |= value;
-
- pci_write_config_dword(chip->pdev,
- O2_SD_PLL_SETTING, scratch_32);
-}

static void o2_pci_led_enable(struct sdhci_pci_chip *chip)
{
@@ -316,23 +425,23 @@ static void sdhci_o2_enable_internal_clock(struct sdhci_host *host)
u32 scratch32;

/* PLL software reset */
- scratch32 = sdhci_readl(host, O2_PLL_WDT_CONTROL1);
+ scratch32 = sdhci_readl(host, O2_PLL_DLL_WDT_CONTROL1);
scratch32 |= O2_PLL_SOFT_RESET;
- sdhci_writel(host, scratch32, O2_PLL_WDT_CONTROL1);
+ sdhci_writel(host, scratch32, O2_PLL_DLL_WDT_CONTROL1);
udelay(1);
scratch32 &= ~(O2_PLL_SOFT_RESET);
- sdhci_writel(host, scratch32, O2_PLL_WDT_CONTROL1);
+ sdhci_writel(host, scratch32, O2_PLL_DLL_WDT_CONTROL1);

/* PLL force active */
scratch32 |= O2_PLL_FORCE_ACTIVE;
- sdhci_writel(host, scratch32, O2_PLL_WDT_CONTROL1);
+ sdhci_writel(host, scratch32, O2_PLL_DLL_WDT_CONTROL1);

/* Wait max 20 ms */
timeout = ktime_add_ms(ktime_get(), 20);
while (1) {
bool timedout = ktime_after(ktime_get(), timeout);

- scratch = sdhci_readw(host, O2_PLL_WDT_CONTROL1);
+ scratch = sdhci_readw(host, O2_PLL_DLL_WDT_CONTROL1);
if (scratch & O2_PLL_LOCK_STATUS)
break;
if (timedout) {
@@ -350,16 +459,16 @@ static void sdhci_o2_enable_internal_clock(struct sdhci_host *host)

out:
/* Cancel PLL force active */
- scratch32 = sdhci_readl(host, O2_PLL_WDT_CONTROL1);
+ scratch32 = sdhci_readl(host, O2_PLL_DLL_WDT_CONTROL1);
scratch32 &= ~O2_PLL_FORCE_ACTIVE;
- sdhci_writel(host, scratch32, O2_PLL_WDT_CONTROL1);
+ sdhci_writel(host, scratch32, O2_PLL_DLL_WDT_CONTROL1);
}

static int sdhci_o2_get_cd(struct mmc_host *mmc)
{
struct sdhci_host *host = mmc_priv(mmc);
-
- sdhci_o2_enable_internal_clock(host);
+ if (!(sdhci_readw(host, O2_PLL_DLL_WDT_CONTROL1) & O2_PLL_LOCK_STATUS))
+ sdhci_o2_enable_internal_clock(host);

return !!(sdhci_readl(host, SDHCI_PRESENT_STATE) & SDHCI_CARD_PRESENT);
}
@@ -369,7 +478,7 @@ static void sdhci_o2_enable_clk(struct sdhci_host *host, u16 clk)
/* Enable internal clock */
clk |= SDHCI_CLOCK_INT_EN;
sdhci_writew(host, clk, SDHCI_CLOCK_CONTROL);
-
+ sdhci_o2_enable_internal_clock(host);
if (sdhci_o2_get_cd(host->mmc)) {
clk |= SDHCI_CLOCK_CARD_EN;
sdhci_writew(host, clk, SDHCI_CLOCK_CONTROL);
@@ -400,7 +509,7 @@ int sdhci_pci_o2_probe_slot(struct sdhci_pci_slot *slot)

chip = slot->chip;
host = slot->host;
-
+ dll_adjust_count = 0;
caps = sdhci_readl(host, SDHCI_CAPABILITIES);

/*
--
2.7.4
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