Hi, I need a way for device drivers to register their needs of memory bandwidth so the optimal frequency for the memory bus clock can be set. Adding one more pm_qos class and a PM_QOS_SUM class type seems to accomplish that neatly, so I'm asking for comments on these very simple patches. The patch to drm/tegra isn't really functional because the EMC clock implementation [0] hasn't been merged yet, and I'm not posting an implementation of a notification listener because in my platform that would be the EMC driver which is still under discussion as well. This will be most useful once we have per-user clock constraints [1], so the EMC driver can set one more floor frequency that together with the other constraints would lead to the effective rate of the memory bus. Thanks, Tomeu [0] http://article.gmane.org/gmane.linux.kernel/1744817 [1] http://article.gmane.org/gmane.linux.kernel/1760039 Tomeu Vizoso (2): PM / QoS: Add PM_QOS_MEMORY_BANDWIDTH class drm/tegra: Request memory bandwidth for the display controller drivers/gpu/drm/tegra/dc.c | 11 +++++++++++ drivers/gpu/drm/tegra/drm.h | 2 ++ include/linux/pm_qos.h | 5 ++++- kernel/power/qos.c | 27 ++++++++++++++++++++++++++- 4 files changed, 43 insertions(+), 2 deletions(-) -- 1.9.3 -- To unsubscribe from this list: send the line "unsubscribe linux-tegra" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
