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authorAndi Shyti <andi.shyti@samsung.com>2016-07-07 10:23:57 +0300
committerMark Brown <broonie@kernel.org>2016-07-07 12:24:32 +0300
commitd9aaf1dc984a448ae5630e53a611a8b3489d1f8d (patch)
tree76f0fdaa51771ac415886dfda2cefb4dd6c5ceb4 /drivers/spi
parent47c169ee67a6adea902d597b9e7bad428c7aac12 (diff)
downloadlinux-d9aaf1dc984a448ae5630e53a611a8b3489d1f8d.tar.xz
spi: s3c64xx: do not disable the clock while configuring the spi
When the clock is coming from the cmu it is not required to be disabled and then re-enabled in order to change the rate. Besides, some exynos chipsets (e.g. exynos5433) do not deliver any to the SFR if one from the pclk ("spi" in this case) or sclk ("busclk") is disabled. Remove the clock disabling/enabling to avoid falling into this situation. Signed-off-by: Sylwester Nawrocki <s.nawrocki@samsung.com> Signed-off-by: Andi Shyti <andi.shyti@samsung.com> Signed-off-by: Mark Brown <broonie@kernel.org>
Diffstat (limited to 'drivers/spi')
-rw-r--r--drivers/spi/spi-s3c64xx.c8
1 files changed, 1 insertions, 7 deletions
diff --git a/drivers/spi/spi-s3c64xx.c b/drivers/spi/spi-s3c64xx.c
index 9f0119f64f93..df88fa161d8a 100644
--- a/drivers/spi/spi-s3c64xx.c
+++ b/drivers/spi/spi-s3c64xx.c
@@ -596,9 +596,7 @@ static void s3c64xx_spi_config(struct s3c64xx_spi_driver_data *sdd)
u32 val;
/* Disable Clock */
- if (sdd->port_conf->clk_from_cmu) {
- clk_disable_unprepare(sdd->src_clk);
- } else {
+ if (!sdd->port_conf->clk_from_cmu) {
val = readl(regs + S3C64XX_SPI_CLK_CFG);
val &= ~S3C64XX_SPI_ENCLK_ENABLE;
writel(val, regs + S3C64XX_SPI_CLK_CFG);
@@ -641,11 +639,7 @@ static void s3c64xx_spi_config(struct s3c64xx_spi_driver_data *sdd)
writel(val, regs + S3C64XX_SPI_MODE_CFG);
if (sdd->port_conf->clk_from_cmu) {
- /* Configure Clock */
- /* There is half-multiplier before the SPI */
clk_set_rate(sdd->src_clk, sdd->cur_speed * 2);
- /* Enable Clock */
- clk_prepare_enable(sdd->src_clk);
} else {
/* Configure Clock */
val = readl(regs + S3C64XX_SPI_CLK_CFG);