diff options
| author | Anson Huang <Anson.Huang@nxp.com> | 2019-01-24 16:09:52 +0800 |
|---|---|---|
| committer | Anson Huang <Anson.Huang@nxp.com> | 2019-01-29 09:26:41 +0800 |
| commit | 3a2b51993d0c9666a6e1bdc4fd45a987ef6f1266 (patch) | |
| tree | ff6ffd2cc25b596716eb90d0c16efcc7e484943e /plat/imx/common/sci | |
| parent | e9b77791ab11b25391ef758d41a39584d14ff2e9 (diff) | |
imx: power optimization for i.mx8qm
Current implementation of i.MX8QM power management related
features does NOT optimize power number, all system resources
like CCI, DDR, and A cluster etc. are kept in STBY mode (powered
ON) when system suspend or CPU hotplug.
To lower the power number, OFF mode should be adopted for those
system resources whenever they can be OFF, A cluster will be OFF
if the CPUs in the cluster are all off line, DDR/MU/DB can be OFF
if system suspend, IRQ steer can be OFF if the wakeup source is
belonged to system controller partition, so wakeup source runtime
check is used to determine if IRQ steer can be OFF before system
suspend.
If resources are powered off for suspend, they should be restored
properly after system resume.
Signed-off-by: Anson Huang <Anson.Huang@nxp.com>
Diffstat (limited to 'plat/imx/common/sci')
| -rw-r--r-- | plat/imx/common/sci/imx8_mu.c | 15 | ||||
| -rw-r--r-- | plat/imx/common/sci/imx8_mu.h | 1 |
2 files changed, 16 insertions, 0 deletions
diff --git a/plat/imx/common/sci/imx8_mu.c b/plat/imx/common/sci/imx8_mu.c index 26d9bdfe..66e956d8 100644 --- a/plat/imx/common/sci/imx8_mu.c +++ b/plat/imx/common/sci/imx8_mu.c @@ -8,6 +8,21 @@ #include "imx8_mu.h" +void MU_Resume(uint32_t base) +{ + uint32_t reg, i; + + reg = mmio_read_32(base + MU_ACR_OFFSET1); + /* Clear GIEn, RIEn, TIEn, GIRn and ABFn. */ + reg &= ~(MU_CR_GIEn_MASK1 | MU_CR_RIEn_MASK1 | MU_CR_TIEn_MASK1 + | MU_CR_GIRn_MASK1 | MU_CR_Fn_MASK1); + mmio_write_32(base + MU_ACR_OFFSET1, reg); + + /* Enable all RX interrupts */ + for (i = 0; i < MU_RR_COUNT; i++) + MU_EnableRxFullInt(base, i); +} + void MU_EnableRxFullInt(uint32_t base, uint32_t index) { uint32_t reg = mmio_read_32(base + MU_ACR_OFFSET1); diff --git a/plat/imx/common/sci/imx8_mu.h b/plat/imx/common/sci/imx8_mu.h index 8c788772..edcac7bf 100644 --- a/plat/imx/common/sci/imx8_mu.h +++ b/plat/imx/common/sci/imx8_mu.h @@ -33,3 +33,4 @@ void MU_SendMessage(uint32_t base, uint32_t regIndex, uint32_t msg); void MU_ReceiveMsg(uint32_t base, uint32_t regIndex, uint32_t *msg); void MU_EnableGeneralInt(uint32_t base, uint32_t index); void MU_EnableRxFullInt(uint32_t base, uint32_t index); +void MU_Resume(uint32_t base); |