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From: Alexander Kurz <akurz@blala.de>
To: barebox@lists.infradead.org
Cc: Alexander Kurz <akurz@blala.de>,
	Uwe Kleine-Koenig <u.kleine-koenig@pengutronix.de>
Subject: [PATCH] spi: imx: make xchg_single timeout value compatible for older boards
Date: Thu, 14 Dec 2017 09:55:54 +0100	[thread overview]
Message-ID: <1513241754-1754-1-git-send-email-akurz@blala.de> (raw)

A call of xchg_single will issue the transfer of 24 data bits with a given
maximum frequency. Since there exist some i.MX based boards with
spi-max-frequency = <100000>, change the xchg_single timeout to still
support those boards.

Fixes: 1439cdf7c6fc ("spi: imx: add timeout to xchg_single")
Signed-off-by: Alexander Kurz <akurz@blala.de>
---
 drivers/spi/imx_spi.c | 7 +++++--
 1 file changed, 5 insertions(+), 2 deletions(-)

diff --git a/drivers/spi/imx_spi.c b/drivers/spi/imx_spi.c
index 7819879..0827de7 100644
--- a/drivers/spi/imx_spi.c
+++ b/drivers/spi/imx_spi.c
@@ -32,8 +32,11 @@
 #include <linux/err.h>
 #include <clock.h>
 
-/* time to wait for STAT_RR getting set */
-#define IMX_SPI_RR_TIMEOUT	10000 /* ns */
+/*
+ * time to wait for STAT_RR getting set, should allow the transfer
+ * of 24 bits at spi-max-frequency of 100kHz
+ */
+#define IMX_SPI_RR_TIMEOUT	250000 /* ns */
 
 struct imx_spi {
 	struct spi_master	master;
-- 
2.1.4


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             reply	other threads:[~2017-12-14  8:58 UTC|newest]

Thread overview: 2+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2017-12-14  8:55 Alexander Kurz [this message]
2017-12-15  7:25 ` Sascha Hauer

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