linux-kernel - [ 04/29] spi/mpc512x-psc: optionally keep PSC SS asserted across xfer segmensts

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Message-Id: <20130410224804.528751852@linuxfoundation.org>
Date:	Wed, 10 Apr 2013 15:49:22 -0700
From:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:	linux-kernel@...r.kernel.org
Cc:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	stable@...r.kernel.org, Gerhard Sittig <gerhard.sittig@....com>,
	Anatolij Gustschin <agust@...x.de>,
	Mark Brown <broonie@...nsource.wolfsonmicro.com>
Subject: [ 04/29] spi/mpc512x-psc: optionally keep PSC SS asserted across xfer segmensts

3.4-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Anatolij Gustschin <agust@...x.de>

commit 1ad849aee5f53353ed88d9cd3d68a51b03a7d44f upstream.

Some SPI slave devices require asserted chip select signal across
multiple transfer segments of an SPI message. Currently the driver
always de-asserts the internal SS signal for every single transfer
segment of the message and ignores the 'cs_change' flag of the
transfer description. Disable the internal chip select (SS) only
if this is needed and indicated by the 'cs_change' flag.

Without this change, each partial transfer of a surrounding
multi-part SPI transaction might erroneously change the SS
signal, which might prevent slaves from answering the request
that was sent in a previous transfer segment because the
transaction could be considered aborted (SS was de-asserted
before reading the response).

Reported-by: Gerhard Sittig <gerhard.sittig@....com>
Signed-off-by: Anatolij Gustschin <agust@...x.de>
Signed-off-by: Mark Brown <broonie@...nsource.wolfsonmicro.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 drivers/spi/spi-mpc512x-psc.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/drivers/spi/spi-mpc512x-psc.c
+++ b/drivers/spi/spi-mpc512x-psc.c
@@ -164,7 +164,7 @@ static int mpc512x_psc_spi_transfer_rxtx

 		for (i = count; i > 0; i--) {
 			data = tx_buf ? *tx_buf++ : 0;
-			if (len == EOFBYTE)
+			if (len == EOFBYTE && t->cs_change)
 				setbits32(&fifo->txcmd, MPC512x_PSC_FIFO_EOF);
 			out_8(&fifo->txdata_8, data);
 			len--;

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