Changes in V4: [1] Added another patch which decides if or when to send a request to the platform based on the Minimum Request Turnaround Time(MRTT) and Maximum Periodic Access Rate(MPAR) to make sure the implementation is compliant to ACPI spec [2] Fixed the condition for pr_debug message in cppc_chan_tx_done()
Changes in V3: Addressed the review comments from Alexey, Ashwin and Timur
Changes in V2: Fixed compilation error on i386
This series introduces changes to reduce the time required to send a frequency transition requests to the platform while using the cppc-cpufreq driver.
With these changes we see significant improvement in the average time to send freq. transition request to the platform. Profiling on an ARM platform showed that the average transaction time per request reduced from 200us to under 20us.
Ashwin Chaugule (1): ACPI / CPPC: Optimize PCC Read Write operations
Prashanth Prakash (4): acpi: cppc: optimized cpc_read and cpc_write mailbox: pcc: optimized pcc_send_data acpi: cppc: replace writeX/readX to PCC with relaxed version acpi/cppc: use MRTT/MPAR to decide if/when a req can be sent
drivers/acpi/cppc_acpi.c | 237 ++++++++++++++++++++++++++++++++++++++--------- drivers/mailbox/pcc.c | 111 ++++++++++++++++++++-- 2 files changed, 295 insertions(+), 53 deletions(-)