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 PATCHV3: * Use readl_relaxed instead of __raw_readl (and the same for writel) * Drop final return in void function * Add Reviewed-by from Fabio to 2nd patch 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 | 39 ++++++++++++++++++++++++++++++++++++++- 3 files changed, 43 insertions(+), 2 deletions(-) -- 2.15.1