Hi,
This improves perf on imx53 by adding support for enabling the Secure
Debug Enable Register (SDER) SUNIDEN bit. This unlocks new
functionality:
ppd before patchset# perf stat -e cycles,instructions sleep 1 2>&1 | grep
instructions
0 instructions # 0.00 insn per cycle
ppd after patchset# perf stat -e cycles,instructions sleep 1 2>&1 | grep
instructions
177864 instructions # 0.05 insn per cycle
Changes since PATCHv2:
* Always enable GPC_DBG_EN when kernel configuration allows using perf
to allow cleanup of the arm-pmu driver.
Changes since PATCHv1:
* Update DTS patch to reference imx53.dtsi's pmu node
* Remove a superfluous newline in first patch
-- Sebastian
Sebastian Reichel (2):
ARM: imx53: add secure-reg-access support for PMU
ARM: dts: imx53: PPD: Enable secure-reg-access
arch/arm/boot/dts/imx53-ppd.dts | 4 ++++
arch/arm/boot/dts/imx53.dtsi | 2 +-
arch/arm/mach-imx/mach-imx53.c | 41 ++++++++++++++++++++++++++++++++++++++++-
3 files changed, 45 insertions(+), 2 deletions(-)
--
2.15.1
