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From: Jean-Christophe PLAGNIOL-VILLARD <plagnioj@jcrosoft.com>
To: barebox@lists.infradead.org
Subject: [PATCH 7/8] atmel_spi: add cs change support
Date: Tue,  6 Nov 2012 20:33:35 +0100	[thread overview]
Message-ID: <1352230416-9396-7-git-send-email-plagnioj@jcrosoft.com> (raw)
In-Reply-To: <1352230416-9396-1-git-send-email-plagnioj@jcrosoft.com>

Signed-off-by: Jean-Christophe PLAGNIOL-VILLARD <plagnioj@jcrosoft.com>
---
 drivers/spi/atmel_spi.c |   24 ++++++++++++++++++++++--
 1 file changed, 22 insertions(+), 2 deletions(-)

diff --git a/drivers/spi/atmel_spi.c b/drivers/spi/atmel_spi.c
index ee0c4b4..793933e 100644
--- a/drivers/spi/atmel_spi.c
+++ b/drivers/spi/atmel_spi.c
@@ -320,6 +320,7 @@ static int atmel_spi_transfer(struct spi_device *spi, struct spi_message *mesg)
 	struct spi_master *master	= spi->master;
 	struct atmel_spi *as		= to_atmel_spi(master);
 	struct spi_transfer *t		= NULL;
+	unsigned int cs_change;
 
 	mesg->actual_length = 0;
 
@@ -335,15 +336,34 @@ static int atmel_spi_transfer(struct spi_device *spi, struct spi_message *mesg)
 
 	cs_activate(as, spi);
 
+	cs_change = 0;
+
 	list_for_each_entry(t, &mesg->transfers, transfer_list) {
 
+		if (cs_change) {
+			udelay(1);
+			cs_deactivate(as, spi);
+			udelay(1);
+			cs_activate(as, spi);
+		}
+
+		cs_change = t->cs_change;
+
 		ret = atmel_spi_do_xfer(spi, as, t);
 		if (ret < 0)
-			goto out;
+			goto err;
 		mesg->actual_length += ret;
+
+		if (cs_change)
+			cs_activate(as, spi);
 	}
 
-out:
+	if (!cs_change)
+		cs_deactivate(as, spi);
+
+	return 0;
+
+err:
 	cs_deactivate(as, spi);
 	return ret;
 }
-- 
1.7.10.4


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  parent reply	other threads:[~2012-11-06 19:35 UTC|newest]

Thread overview: 11+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2012-11-06 19:30 [PATCH 0/8] atmtel: fix spi driver + rm9200 Jean-Christophe PLAGNIOL-VILLARD
2012-11-06 19:33 ` [PATCH 1/8] atmel_spi: use device id as bus num Jean-Christophe PLAGNIOL-VILLARD
2012-11-06 19:33   ` [PATCH 2/8] atmel_spi: split transfert to atmel_spi_do_xfer Jean-Christophe PLAGNIOL-VILLARD
2012-11-13 14:45     ` Thomas Petazzoni
2012-11-06 19:33   ` [PATCH 3/8] atmel_spi: after setup the cs need to be disable Jean-Christophe PLAGNIOL-VILLARD
2012-11-06 19:33   ` [PATCH 4/8] atmel_spi: add sanity check in setup Jean-Christophe PLAGNIOL-VILLARD
2012-11-06 19:33   ` [PATCH 5/8] atmel_spi: fix cs support Jean-Christophe PLAGNIOL-VILLARD
2012-11-06 19:33   ` [PATCH 6/8] atmel_spi: drop setup during transfer Jean-Christophe PLAGNIOL-VILLARD
2012-11-06 19:33   ` Jean-Christophe PLAGNIOL-VILLARD [this message]
2012-11-06 19:33   ` [PATCH 8/8] at91rm9200: fix spi cs support Jean-Christophe PLAGNIOL-VILLARD
2012-11-12  7:36 ` [PATCH 0/8] atmtel: fix spi driver + rm9200 Sascha Hauer

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