linux-kernel - [PATCH 2/3] PCI: dwc: qcom: Set suspend

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Date:   Fri, 13 May 2022 16:30:26 +0530
From:   Manivannan Sadhasivam <manivannan.sadhasivam@...aro.org>
To:     bhelgaas@...gle.com, lorenzo.pieralisi@....com, kbusch@...nel.org,
        hch@....de
Cc:     linux-nvme@...ts.infradead.org, linux-pci@...r.kernel.org,
        linux-arm-msm@...r.kernel.org, linux-kernel@...r.kernel.org,
        svarbanov@...sol.com, bjorn.andersson@...aro.org, axboe@...com,
        quic_vbadigan@...cinc.com, quic_krichai@...cinc.com,
        quic_nitirawa@...cinc.com, vidyas@...dia.com, sagi@...mberg.me,
        Manivannan Sadhasivam <manivannan.sadhasivam@...aro.org>
Subject: [PATCH 2/3] PCI: dwc: qcom: Set suspend_poweroff flag for SC7280

For aggressive power saving on SC7280 SoCs, the power for the PCI devices
will be taken off during system suspend. Hence, notify the same to the
PCI device drivers using "suspend_poweroff" flag so that the drivers can
prepare the PCI devices to handle the poweroff and recover them during
resume.

Signed-off-by: Manivannan Sadhasivam <manivannan.sadhasivam@...aro.org>
---
 drivers/pci/controller/dwc/pcie-qcom.c | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/drivers/pci/controller/dwc/pcie-qcom.c b/drivers/pci/controller/dwc/pcie-qcom.c
index 6ab90891801d..4b0ad2827f8f 100644
--- a/drivers/pci/controller/dwc/pcie-qcom.c
+++ b/drivers/pci/controller/dwc/pcie-qcom.c
@@ -199,6 +199,7 @@ struct qcom_pcie_cfg {
 	unsigned int has_ddrss_sf_tbu_clk:1;
 	unsigned int has_aggre0_clk:1;
 	unsigned int has_aggre1_clk:1;
+	unsigned int suspend_poweroff:1;
 };
 
 struct qcom_pcie {
@@ -1220,6 +1221,10 @@ static int qcom_pcie_init_2_7_0(struct qcom_pcie *pcie)
 	if (pcie->cfg->pipe_clk_need_muxing)
 		clk_set_parent(res->pipe_clk_src, res->ref_clk_src);
 
+	/* Indicate PCI device drivers that the power will be taken off during system suspend */
+	if (pcie->cfg->suspend_poweroff)
+		pci->pp.bridge->suspend_poweroff = true;
+
 	ret = clk_bulk_prepare_enable(res->num_clks, res->clks);
 	if (ret < 0)
 		goto err_disable_regulators;
@@ -1548,6 +1553,7 @@ static const struct qcom_pcie_cfg sc7280_cfg = {
 	.ops = &ops_1_9_0,
 	.has_tbu_clk = true,
 	.pipe_clk_need_muxing = true,
+	.suspend_poweroff = true,
 };
 
 static const struct dw_pcie_ops dw_pcie_ops = {
-- 
2.25.1