From 8a33a373e5ffb6040c58ff41ea48ba21d5f8b5e9 Mon Sep 17 00:00:00 2001 From: Alek Du Date: Wed, 30 Mar 2011 23:09:53 +0800 Subject: [PATCH] spi/dw_spi: remove the un-necessary flush() The flush() is used to drain all the left data in rx fifo, currently is is always called together with disabling hw. But from spec, disabling hw will also reset all the fifo, so flush() is not needed. Signed-off-by: Alek Du Signed-off-by: Feng Tang Signed-off-by: Grant Likely --- drivers/spi/dw_spi.c | 15 +-------------- 1 file changed, 1 insertion(+), 14 deletions(-) diff --git a/drivers/spi/dw_spi.c b/drivers/spi/dw_spi.c index c4fca3d9d45f..d3aaf8db86cc 100644 --- a/drivers/spi/dw_spi.c +++ b/drivers/spi/dw_spi.c @@ -173,17 +173,6 @@ static void wait_till_not_busy(struct dw_spi *dws) "DW SPI: Status keeps busy for 5000us after a read/write!\n"); } -static void flush(struct dw_spi *dws) -{ - while (dw_readw(dws, sr) & SR_RF_NOT_EMPT) { - dw_readw(dws, dr); - cpu_relax(); - } - - wait_till_not_busy(dws); -} - - static int dw_writer(struct dw_spi *dws) { u16 txw = 0; @@ -297,8 +286,7 @@ static void giveback(struct dw_spi *dws) static void int_error_stop(struct dw_spi *dws, const char *msg) { - /* Stop and reset hw */ - flush(dws); + /* Stop the hw */ spi_enable_chip(dws, 0); dev_err(&dws->master->dev, "%s\n", msg); @@ -800,7 +788,6 @@ static void spi_hw_init(struct dw_spi *dws) spi_enable_chip(dws, 0); spi_mask_intr(dws, 0xff); spi_enable_chip(dws, 1); - flush(dws); /* * Try to detect the FIFO depth if not set by interface driver,