| commit | 3292094e88ce6b76714dad8ec4b43d7c5c12ada2 | [log] [tgz] |
|---|---|---|
| author | Magnus Damm <damm@igel.co.jp> | Thu Dec 25 18:17:26 2008 +0900 |
| committer | Paul Mundt <lethal@linux-sh.org> | Tue Jan 27 14:49:10 2009 +0900 |
| tree | 0469a3523b1794a9ecb9f5df99ce3d726d442b2a | |
| parent | 0fc64cc0a27288e77ee8e12648d59632649371fc [diff] |
sh: lockless gpio_set_value() This patch optimizes the gpio data register handling for gpio_set_value(). Instead of using the good old spinlock-plus-read-modify-write strategy we now use a shadow register and atomic operations. This improves the bitbanging mmc performance on Migo-R from 26 Kbytes/s to 40 Kbytes/s. Signed-off-by: Magnus Damm <damm@igel.co.jp> Signed-off-by: Paul Mundt <lethal@linux-sh.org>