diff options
| -rw-r--r-- | drivers/spi/spi-tegra.c | 6 |
1 files changed, 6 insertions, 0 deletions
diff --git a/drivers/spi/spi-tegra.c b/drivers/spi/spi-tegra.c index 0a0a72f3437f..070cc1581efd 100644 --- a/drivers/spi/spi-tegra.c +++ b/drivers/spi/spi-tegra.c @@ -264,6 +264,9 @@ static inline void spi_tegra_writel(struct spi_tegra_data *tspi, if (!tspi->clk_state) BUG(); writel(val, tspi->base + reg); + + /* Synchronize write by reading back the register */ + readl(tspi->base + SLINK_MAS_DATA); } static void cancel_dma(struct tegra_dma_channel *dma_chan, @@ -1584,6 +1587,9 @@ static int tegra_spi_runtime_idle(struct device *dev) struct spi_master *master = dev_get_drvdata(dev); struct spi_tegra_data *tspi = spi_master_get_devdata(master); + /* Flush all write which are in PPSB queue by reading back */ + spi_tegra_readl(tspi, SLINK_MAS_DATA); + tspi->clk_state = 0; clk_disable(tspi->clk); clk_disable(tspi->sclk); |