From d37e96ecb9886714e0b5e167a91404cde8351b19 Mon Sep 17 00:00:00 2001 From: Soeren Moch Date: Fri, 24 Oct 2014 16:33:30 +0200 Subject: video: speedup writing strings to fb console With enabled framebuffer console the printenv command can take several seconds to complete. This patch temporarily disables cache flush when writing strings to fb console. Then there is no noticable delay anymore. Tested with imx6 hdmi framebuffer. Signed-off-by: Soeren Moch Acked-by: Stefano Babic --- drivers/video/cfb_console.c | 9 +++++++++ 1 file changed, 9 insertions(+) (limited to 'drivers') diff --git a/drivers/video/cfb_console.c b/drivers/video/cfb_console.c index 6aa50cb4f9..a347e13d7d 100644 --- a/drivers/video/cfb_console.c +++ b/drivers/video/cfb_console.c @@ -1160,10 +1160,19 @@ static void video_putc(struct stdio_dev *dev, const char c) static void video_puts(struct stdio_dev *dev, const char *s) { + int flush = cfb_do_flush_cache; int count = strlen(s); + /* temporarily disable cache flush */ + cfb_do_flush_cache = 0; + while (count--) video_putc(dev, *s++); + + if (flush) { + cfb_do_flush_cache = flush; + flush_cache(VIDEO_FB_ADRS, VIDEO_SIZE); + } } /* -- cgit v1.2.1