Hi, Since it's introduction, our MMC controller has had its external clocks running all the time. While that was working great, the power usage and most importantly the EMI that it generated was pretty bad. Let's implement some runtime_pm hooks with an autosuspend to cut the external clock when the MMC is not active. I didn't get all the way to also shutdown the bus clocks since on some older SoCs (before the A31), it also means that the controler will be reset which has some quite important implications obviously. And I couldn't make it work reliably at the moment. Anyway, it can always be implemented as a second step if needed. (Quite simple) benchmarks have shown no noticeable regressions since the controller state is maintained. Let me know what you think, Maxime Maxime Ripard (2): mmc: sunxi: Reorder the headers mmc: sunxi: Add runtime_pm support drivers/mmc/host/sunxi-mmc.c | 133 +++++++++++++++++++++--------------- 1 file changed, 80 insertions(+), 53 deletions(-) base-commit: 4fbd8d194f06c8a3fd2af1ce560ddb31f7ec8323 -- git-series 0.9.1 -- To unsubscribe from this list: send the line "unsubscribe linux-mmc" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
