From: Anton Vorontsov <avorontsov-hkdhdckH98+B+jHODAdFcQ@public.gmane.org>
To: spi-devel-general-5NWGOfrQmneRv+LV9MX5uipxlwaOVQ5f@public.gmane.org
Cc: linuxppc-dev-mnsaURCQ41sdnm+yROfE0A@public.gmane.org
Subject: [PATCH 1/4] [POWERPC][SPI] spi_mpc83xx.c: should turn off SPI unit while switching any mode.
Date: Thu, 26 Jul 2007 17:13:46 +0400 [thread overview]
Message-ID: <20070726131346.GA3417@localhost.localdomain> (raw)
In-Reply-To: <20070726131134.GA3309-bi+AKbBUZKY6gyzm1THtWbp2dZbC/Bob@public.gmane.org>
Documentation clearly states, that mode should not be changed
till SPMODE_ENABLE bit set. I've seen hangs w/o this patch.
Signed-off-by: Anton Vorontsov <avorontsov-hkdhdckH98+B+jHODAdFcQ@public.gmane.org>
---
drivers/spi/spi_mpc83xx.c | 4 ++++
1 files changed, 4 insertions(+), 0 deletions(-)
diff --git a/drivers/spi/spi_mpc83xx.c b/drivers/spi/spi_mpc83xx.c
index 3295cfc..0b99fd9 100644
--- a/drivers/spi/spi_mpc83xx.c
+++ b/drivers/spi/spi_mpc83xx.c
@@ -176,6 +176,8 @@ static void mpc83xx_spi_chipselect(struct spi_device *spi, int value)
regval |= SPMODE_PM(pm);
}
+ /* Turn off SPI unit prior changing mode */
+ mpc83xx_spi_write_reg(&mpc83xx_spi->base->mode, 0);
mpc83xx_spi_write_reg(&mpc83xx_spi->base->mode, regval);
if (mpc83xx_spi->activate_cs)
mpc83xx_spi->activate_cs(spi->chip_select, pol);
@@ -249,6 +251,8 @@ int mpc83xx_spi_setup_transfer(struct spi_device *spi, struct spi_transfer *t)
regval &= 0xff0fffff;
regval |= SPMODE_LEN(bits_per_word);
+ /* Turn off SPI unit prior changing mode */
+ mpc83xx_spi_write_reg(&mpc83xx_spi->base->mode, 0);
mpc83xx_spi_write_reg(&mpc83xx_spi->base->mode, regval);
return 0;
--
1.5.0.6
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next prev parent reply other threads:[~2007-07-26 13:13 UTC|newest]
Thread overview: 9+ messages / expand[flat|nested] mbox.gz Atom feed top
2007-07-26 13:11 [PATCH 0/4] Few spi_mpc83xx.c fixes and improvements Anton Vorontsov
[not found] ` <20070726131134.GA3309-bi+AKbBUZKY6gyzm1THtWbp2dZbC/Bob@public.gmane.org>
2007-07-26 13:13 ` Anton Vorontsov [this message]
[not found] ` <20070726131346.GA3417-bi+AKbBUZKY6gyzm1THtWbp2dZbC/Bob@public.gmane.org>
2007-07-27 6:32 ` [PATCH 1/4] [POWERPC][SPI] spi_mpc83xx.c: should turn off SPI unit while switching any mode Kumar Gala
[not found] ` <250FD11F-9ADC-46CC-B652-1148FC549316-XVmvHMARGAS8U2dJNN8I7kB+6BGkLq7r@public.gmane.org>
2007-07-27 13:36 ` Anton Vorontsov
2007-07-26 13:14 ` [PATCH 2/4] [POWERPC][SPI] spi_mpc83xx: get rid of magic numbers Anton Vorontsov
2007-07-26 13:14 ` [PATCH 3/4] [POWERPC][SPI] spi_mpc83xx: support for lsb mode switching Anton Vorontsov
2007-07-26 13:14 ` [PATCH 4/4] [POWERPC][SPI] spi_mpc83xx: fix LSB mode shifts Anton Vorontsov
2007-07-27 2:58 ` [PATCH 0/4] Few spi_mpc83xx.c fixes and improvements David Brownell
[not found] ` <200707261958.09127.david-b-yBeKhBN/0LDR7s880joybQ@public.gmane.org>
2007-07-27 6:32 ` Kumar Gala
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