From c3c9a2c4b94f2c92132298b705a6f5f9dc1ccd3f Mon Sep 17 00:00:00 2001 From: Luca Ellero Date: Wed, 18 Apr 2018 11:26:26 +0200 Subject: [PATCH] mtd: dataflash: replace msleep with usleep_range Since msleep is based on jiffies, this 3 ms sleep becomes actually 20 ms. Worst of all, since this sleep is used in a loop when writing, a single page write (256 to 1024 bytes) causes 17 ms extra time. When writing large files (for example u-boot is usually 512 KB) this delay adds up to minutes. See Documentation/timers/timers-howto.txt "Why not msleep for (1ms - 20ms)". Signed-off-by: Luca Ellero Signed-off-by: Boris Brezillon --- drivers/mtd/devices/mtd_dataflash.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/drivers/mtd/devices/mtd_dataflash.c b/drivers/mtd/devices/mtd_dataflash.c index aaaeaae01e1d..3a6f450d1093 100644 --- a/drivers/mtd/devices/mtd_dataflash.c +++ b/drivers/mtd/devices/mtd_dataflash.c @@ -140,7 +140,7 @@ static int dataflash_waitready(struct spi_device *spi) if (status & (1 << 7)) /* RDY/nBSY */ return status; - msleep(3); + usleep_range(3000, 4000); } }