On 4/30/2024 10:56 AM, Manivannan Sadhasivam wrote:
On Sat, Apr 27, 2024 at 07:22:39AM +0530, Krishna chaitanya chundru wrote:
QCOM Resource Power Manager-hardened (RPMh) is a hardware block which
maintains hardware state of a regulator by performing max aggregation of
the requests made by all of the clients.
PCIe controller can operate on different RPMh performance state of power
domain based on the speed of the link. And this performance state varies
from target to target, like some controllers support GEN3 in NOM (Nominal)
voltage corner, while some other supports GEN3 in low SVS (static voltage
scaling).
The SoC can be more power efficient if we scale the performance state
based on the aggregate PCIe link bandwidth.
Add Operating Performance Points (OPP) support to vote for RPMh state based
on the aggregate link bandwidth.
OPP can handle ICC bw voting also, so move ICC bw voting through OPP
framework if OPP entries are present.
As we are moving ICC voting as part of OPP, don't initialize ICC if OPP
is supported.
Before PCIe link is initialized vote for highest OPP in the OPP table,
so that we are voting for maximum voltage corner for the link to come up
in maximum supported speed.
Reviewed-by: Manivannan Sadhasivam <manivannan.sadhasivam@xxxxxxxxxx>
Signed-off-by: Krishna chaitanya chundru <quic_krichai@xxxxxxxxxxx>
---
drivers/pci/controller/dwc/pcie-qcom.c | 81 ++++++++++++++++++++++++++++------
1 file changed, 67 insertions(+), 14 deletions(-)
diff --git a/drivers/pci/controller/dwc/pcie-qcom.c b/drivers/pci/controller/dwc/pcie-qcom.c
index 465d63b4be1c..40c875c518d8 100644
--- a/drivers/pci/controller/dwc/pcie-qcom.c
+++ b/drivers/pci/controller/dwc/pcie-qcom.c
[...]
@@ -1661,6 +1711,9 @@ static int qcom_pcie_suspend_noirq(struct device *dev)
ret = icc_disable(pcie->icc_cpu);
if (ret)
dev_err(dev, "Failed to disable CPU-PCIe interconnect path: %d\n", ret);
+
+ if (!pcie->icc_mem)
+ dev_pm_opp_set_opp(pcie->pci->dev, NULL);
At the start of the suspend, there is a call to icc_set_bw() for PCIe-MEM path.
Don't you want to update it too?
- Mani
if opp is supported we just need to call dev_pm_opp_set_opp() only once
which will take care for both PCIe-MEM & CPU-PCIe path.
so we are not adding explicitly there.
- Krishna Chaitanya.
