From e6a0a8bfef1094084e53bfaad6d512c23da7a6dd Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Uwe=20Kleine-K=C3=B6nig?= <u.kleine-koenig@pengutronix.de>
Date: Thu, 1 Oct 2009 15:44:33 -0700
Subject: [PATCH] spi-imx: strip down chipselect function to only drive the
chipselect
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spi_imx_chipselect() made things that should be (and mostly are) done by
spi_imx_setupxfer. Only setting the tx and rx functions was missing.
Signed-off-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de>
Acked-by: Sascha Hauer <s.hauer@pengutronix.de>
Cc: David Brownell <dbrownell@users.sourceforge.net>
Cc: Guennadi Liakhovetski <g.liakhovetski@gmx.de>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
---
drivers/spi/spi_imx.c | 50 +++++++++++++++----------------------------
1 file changed, 17 insertions(+), 33 deletions(-)
diff --git a/drivers/spi/spi_imx.c b/drivers/spi/spi_imx.c
index 2fec1170b6c0..89c22efedfb0 100644
--- a/drivers/spi/spi_imx.c
+++ b/drivers/spi/spi_imx.c
@@ -354,43 +354,14 @@ static int mx1_rx_available(struct spi_imx_data *spi_imx)
static void spi_imx_chipselect(struct spi_device *spi, int is_active)
{
struct spi_imx_data *spi_imx = spi_master_get_devdata(spi->master);
- unsigned int cs = 0;
int gpio = spi_imx->chipselect[spi->chip_select];
- struct spi_imx_config config;
-
- if (spi->mode & SPI_CS_HIGH)
- cs = 1;
+ int active = is_active != BITBANG_CS_INACTIVE;
+ int dev_is_lowactive = !(spi->mode & SPI_CS_HIGH);
- if (is_active == BITBANG_CS_INACTIVE) {
- if (gpio >= 0)
- gpio_set_value(gpio, !cs);
+ if (gpio < 0)
return;
- }
-
- config.bpw = spi->bits_per_word;
- config.speed_hz = spi->max_speed_hz;
- config.mode = spi->mode;
- config.cs = spi_imx->chipselect[spi->chip_select];
-
- spi_imx->config(spi_imx, &config);
-
- /* Initialize the functions for transfer */
- if (config.bpw <= 8) {
- spi_imx->rx = spi_imx_buf_rx_u8;
- spi_imx->tx = spi_imx_buf_tx_u8;
- } else if (config.bpw <= 16) {
- spi_imx->rx = spi_imx_buf_rx_u16;
- spi_imx->tx = spi_imx_buf_tx_u16;
- } else if (config.bpw <= 32) {
- spi_imx->rx = spi_imx_buf_rx_u32;
- spi_imx->tx = spi_imx_buf_tx_u32;
- } else
- BUG();
-
- if (gpio >= 0)
- gpio_set_value(gpio, cs);
- return;
+ gpio_set_value(gpio, dev_is_lowactive ^ active);
}
static void spi_imx_push(struct spi_imx_data *spi_imx)
@@ -451,6 +422,19 @@ static int spi_imx_setupxfer(struct spi_device *spi,
if (!config.speed_hz)
config.speed_hz = spi->max_speed_hz;
+ /* Initialize the functions for transfer */
+ if (config.bpw <= 8) {
+ spi_imx->rx = spi_imx_buf_rx_u8;
+ spi_imx->tx = spi_imx_buf_tx_u8;
+ } else if (config.bpw <= 16) {
+ spi_imx->rx = spi_imx_buf_rx_u16;
+ spi_imx->tx = spi_imx_buf_tx_u16;
+ } else if (config.bpw <= 32) {
+ spi_imx->rx = spi_imx_buf_rx_u32;
+ spi_imx->tx = spi_imx_buf_tx_u32;
+ } else
+ BUG();
+
spi_imx->config(spi_imx, &config);
return 0;
--
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