linux-kernel - [PATCH V8 1/5] mmc: sdhci: Change timeout of loop for checking internal clock stable

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Message-Id: <0c090d866e2b4cd7966672b1b6cf5667a5ce39dd.1567734321.git.benchuanggli@gmail.com>
Date:   Fri,  6 Sep 2019 10:30:53 +0800
From:   Ben Chuang <benchuanggli@...il.com>
To:     adrian.hunter@...el.com, ulf.hansson@...aro.org
Cc:     linux-mmc@...r.kernel.org, linux-kernel@...r.kernel.org,
        johnsonm@...lj.org, ben.chuang@...esyslogic.com.tw,
        Ben Chuang <benchuanggli@...il.com>
Subject: [PATCH V8 1/5] mmc: sdhci: Change timeout of loop for checking internal clock stable

From: Ben Chuang <ben.chuang@...esyslogic.com.tw>

According to section 3.2.1 internal clock setup in SD Host Controller
Simplified Specifications 4.20, the timeout of loop for checking
internal clock stable is defined as 150ms.

Signed-off-by: Ben Chuang <ben.chuang@...esyslogic.com.tw>
Co-developed-by: Michael K Johnson <johnsonm@...lj.org>
Signed-off-by: Michael K Johnson <johnsonm@...lj.org>
Acked-by: Adrian Hunter <adrian.hunter@...el.com>
---
 drivers/mmc/host/sdhci.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/mmc/host/sdhci.c b/drivers/mmc/host/sdhci.c
index 59acf8e3331e..bed0760a6c2a 100644
--- a/drivers/mmc/host/sdhci.c
+++ b/drivers/mmc/host/sdhci.c
@@ -1636,8 +1636,8 @@ void sdhci_enable_clk(struct sdhci_host *host, u16 clk)
 	clk |= SDHCI_CLOCK_INT_EN;
 	sdhci_writew(host, clk, SDHCI_CLOCK_CONTROL);
 
-	/* Wait max 20 ms */
-	timeout = ktime_add_ms(ktime_get(), 20);
+	/* Wait max 150 ms */
+	timeout = ktime_add_ms(ktime_get(), 150);
 	while (1) {
 		bool timedout = ktime_after(ktime_get(), timeout);
 
-- 
2.23.0