From d9aaf1dc984a448ae5630e53a611a8b3489d1f8d Mon Sep 17 00:00:00 2001 From: Andi Shyti Date: Thu, 7 Jul 2016 16:23:57 +0900 Subject: [PATCH] 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 Signed-off-by: Andi Shyti Signed-off-by: Mark Brown --- drivers/spi/spi-s3c64xx.c | 8 +------- 1 file changed, 1 insertion(+), 7 deletions(-) diff --git a/drivers/spi/spi-s3c64xx.c b/drivers/spi/spi-s3c64xx.c index 9f0119f..df88fa1 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); -- 2.7.4