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8b0f578898
pcc_send_data() can be invoked during the execution of performance critical code as in cppc_cpufreq driver. With acpi_* APIs, the doorbell register accessed in pcc_send_data() if present in system memory will be searched (in cached virt to phys addr mapping), mapped, read/written and then unmapped. These operations take significant amount of time. This patch maps the performance critical doorbell register during init and then reads/writes to it directly using the mapped virtual address. This patch + similar changes to CPPC acpi driver reduce the time per freq. transition from around 200us to about 20us for the CPPC cpufreq driver Signed-off-by: Prashanth Prakash <pprakash@codeaurora.org> Acked-by: Ashwin Chaugule <ashwin.chaugule@linaro.org> Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com> |
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| .. | ||
| arm_mhu.c | ||
| bcm2835-mailbox.c | ||
| Kconfig | ||
| mailbox-altera.c | ||
| mailbox-sti.c | ||
| mailbox-test.c | ||
| mailbox.c | ||
| mailbox.h | ||
| Makefile | ||
| omap-mailbox.c | ||
| pcc.c | ||
| pl320-ipc.c | ||