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From 0f5cf5dcc3ca4f8e610ebe1e62e3d3546b9d09ca Mon Sep 17 00:00:00 2001
From: Yangbo Lu <yangbo.lu@nxp.com>
Date: Mon, 16 Sep 2019 19:17:44 +0800
Subject: [PATCH] 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>
---
drivers/mmc/host/sdhci-of-esdhc.c | 35 ++++++++++++++++++++++++++++-------
1 file changed, 28 insertions(+), 7 deletions(-)
--- a/drivers/mmc/host/sdhci-of-esdhc.c
+++ b/drivers/mmc/host/sdhci-of-esdhc.c
@@ -592,6 +592,32 @@ static void esdhc_clock_enable(struct sd
}
}
+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);
@@ -684,9 +710,7 @@ static void esdhc_of_set_clock(struct sd
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 */
@@ -888,10 +912,7 @@ static void esdhc_tuning_block_enable(st
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)
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