From: Yangbo Lu <yangbo.lu@xxxxxxx>
Currently only LX2160A eSDHC supports eMMC HS400. According to
a large number of tests, eMMC HS400 failed to work at 150MHz,
and for a few boards failed to work at 175MHz. But eMMC HS400
worked fine on 200MHz. We hadn't found the root cause but
setting eSDHC_DLLCFG0[DLL_FREQ_SEL] = 0 using slow delay chain
seemed to resovle this issue. Let's use this as fixup for now.
Signed-off-by: Yangbo Lu <yangbo.lu@xxxxxxx>
Signed-off-by: Yinbo Zhu <yinbo.zhu@xxxxxxx>
---
Change in v2:
Limit the erratum was executed when the soc is lx2160a.
drivers/mmc/host/sdhci-of-esdhc.c | 16 +++++++++++++++-
1 files changed, 15 insertions(+), 1 deletions(-)
diff --git a/drivers/mmc/host/sdhci-of-esdhc.c b/drivers/mmc/host/sdhci-of-esdhc.c
index 199abd5..8071fde 100644
--- a/drivers/mmc/host/sdhci-of-esdhc.c
+++ b/drivers/mmc/host/sdhci-of-esdhc.c
@@ -81,6 +81,7 @@ struct sdhci_esdhc {
bool quirk_limited_clk_division;
bool quirk_unreliable_pulse_detection;
bool quirk_fixup_tuning;
+ bool quirk_incorrect_delay_chain;
unsigned int peripheral_clock;
const struct esdhc_clk_fixup *clk_fixup;
u32 div_ratio;
@@ -540,6 +541,11 @@ static void esdhc_clock_enable(struct sdhci_host *host, bool enable)
}
}
+static struct soc_device_attribute soc_incorrect_delay_chain[] = {
+ { .family = "QorIQ LX2160A", .revision = "1.0", },
+ { },
+};
+
static void esdhc_of_set_clock(struct sdhci_host *host, unsigned int clock)
{
struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);
@@ -624,7 +630,10 @@ static void esdhc_of_set_clock(struct sdhci_host *host, unsigned int clock)
esdhc_clock_enable(host, true);
temp = sdhci_readl(host, ESDHC_DLLCFG0);
- temp |= ESDHC_DLL_ENABLE | ESDHC_DLL_FREQ_SEL;
+ temp |= ESDHC_DLL_ENABLE;
+ if (host->mmc->actual_clock == MMC_HS200_MAX_DTR ||
+ esdhc->quirk_incorrect_delay_chain == false)
+ temp |= ESDHC_DLL_FREQ_SEL;
sdhci_writel(host, temp, ESDHC_DLLCFG0);
temp = sdhci_readl(host, ESDHC_TBCTL);
sdhci_writel(host, temp | ESDHC_HS400_WNDW_ADJUST, ESDHC_TBCTL);
@@ -985,6 +994,11 @@ static void esdhc_init(struct platform_device *pdev, struct sdhci_host *host)
else
esdhc->quirk_unreliable_pulse_detection = false;
+ if (soc_device_match(soc_incorrect_delay_chain))
+ esdhc->quirk_incorrect_delay_chain = true;
+ else
+ esdhc->quirk_incorrect_delay_chain = false;
+
match = of_match_node(sdhci_esdhc_of_match, pdev->dev.of_node);
if (match)
esdhc->clk_fixup = match->data;
--
1.7.1
