On Sat, Oct 8, 2016 at 1:53 PM, Bin Meng bmeng.cn@gmail.com wrote:
Hi Simon,
On Sat, Oct 8, 2016 at 10:25 AM, Bin Meng bmeng.cn@gmail.com wrote:
Hi Simon,
On Thu, Oct 6, 2016 at 10:42 AM, Simon Glass sjg@chromium.org wrote:
Bring in a faster memmove() from Linux 4.7. This speeds up scrolling on the display.
Signed-off-by: Simon Glass sjg@chromium.org
Changes in v2:
- Move the code into string.c
- Fix multi-line comments that should not be
arch/x86/include/asm/string.h | 2 +- arch/x86/lib/string.c | 161 ++++++++++++++++++++++++++++++++++++++++++ 2 files changed, 162 insertions(+), 1 deletion(-)
Reviewed-by: Bin Meng bmeng.cn@gmail.com
Tested on Crown Bay with an external PCIe graphics card Tested-by: Bin Meng bmeng.cn@gmail.com
However, I did not see significant speed up on screen scrolling...
Crown Bay is still using cfb_console.c, which is the legacy driver that does not use memmove(). Looks the new console_xxx driver is using memmove(). I guess I will need convert Crown Bay to use DM video.
Testing shows that on Crown Bay, the DM driver with the optimized memmove() does not improve the performance compared to legacy cfb_console driver. But on Bayleybay, memmove() indeed helps the screen scrolling.
Regards, Bin