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authorYangbo Lu <yangbo.lu@nxp.com>2019-10-09 10:41:39 +0300
committerUlf Hansson <ulf.hansson@linaro.org>2019-11-13 18:10:16 +0300
commit6e32f65c14f13c728c3491499d45ecf8bb83efd4 (patch)
tree405974d2cddc0306d58a7e94574c5e27873ced88 /drivers/mmc
parent727d836a375adc49f824a80a824a7e91ddac9d88 (diff)
downloadlinux-6e32f65c14f13c728c3491499d45ecf8bb83efd4.tar.xz
mmc: sdhci-of-esdhc: poll ESDHC_FLUSH_ASYNC_FIFO bit until completion
The ESDHC_FLUSH_ASYNC_FIFO bit which is set to flush asynchronous FIFO should be polled until it's auto cleared by hardware. Signed-off-by: Yangbo Lu <yangbo.lu@nxp.com> Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
Diffstat (limited to 'drivers/mmc')
-rw-r--r--drivers/mmc/host/sdhci-of-esdhc.c35
1 files changed, 28 insertions, 7 deletions
diff --git a/drivers/mmc/host/sdhci-of-esdhc.c b/drivers/mmc/host/sdhci-of-esdhc.c
index 1d1953dfc54b..d4bcf9536fff 100644
--- a/drivers/mmc/host/sdhci-of-esdhc.c
+++ b/drivers/mmc/host/sdhci-of-esdhc.c
@@ -560,6 +560,32 @@ static void esdhc_clock_enable(struct sdhci_host *host, bool enable)
}
}
+static void esdhc_flush_async_fifo(struct sdhci_host *host)
+{
+ ktime_t timeout;
+ u32 val;
+
+ val = sdhci_readl(host, ESDHC_DMA_SYSCTL);
+ val |= ESDHC_FLUSH_ASYNC_FIFO;
+ sdhci_writel(host, val, ESDHC_DMA_SYSCTL);
+
+ /* Wait max 20 ms */
+ timeout = ktime_add_ms(ktime_get(), 20);
+ while (1) {
+ bool timedout = ktime_after(ktime_get(), timeout);
+
+ if (!(sdhci_readl(host, ESDHC_DMA_SYSCTL) &
+ ESDHC_FLUSH_ASYNC_FIFO))
+ break;
+ if (timedout) {
+ pr_err("%s: flushing asynchronous FIFO timeout.\n",
+ mmc_hostname(host->mmc));
+ break;
+ }
+ usleep_range(10, 20);
+ }
+}
+
static void esdhc_of_set_clock(struct sdhci_host *host, unsigned int clock)
{
struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);
@@ -652,9 +678,7 @@ static void esdhc_of_set_clock(struct sdhci_host *host, unsigned int clock)
sdhci_writel(host, temp | ESDHC_HS400_WNDW_ADJUST, ESDHC_TBCTL);
esdhc_clock_enable(host, false);
- temp = sdhci_readl(host, ESDHC_DMA_SYSCTL);
- temp |= ESDHC_FLUSH_ASYNC_FIFO;
- sdhci_writel(host, temp, ESDHC_DMA_SYSCTL);
+ esdhc_flush_async_fifo(host);
}
/* Wait max 20 ms */
@@ -814,10 +838,7 @@ static void esdhc_tuning_block_enable(struct sdhci_host *host, bool enable)
u32 val;
esdhc_clock_enable(host, false);
-
- val = sdhci_readl(host, ESDHC_DMA_SYSCTL);
- val |= ESDHC_FLUSH_ASYNC_FIFO;
- sdhci_writel(host, val, ESDHC_DMA_SYSCTL);
+ esdhc_flush_async_fifo(host);
val = sdhci_readl(host, ESDHC_TBCTL);
if (enable)