On Tue, Jun 27, 2023 at 06:33:01AM +0530, Krishna Chaitanya Chundru wrote:
>
> On 6/23/2023 11:04 AM, Manivannan Sadhasivam wrote:
> > On Wed, Jun 14, 2023 at 07:54:26PM +0530, Krishna chaitanya chundru wrote:
> > > Add support to vote for ICC bandwidth based on the link
> > > speed and width.
> > >
> > > This patch is inspired from pcie-qcom driver to add basic
> > > interconnect support.
> > >
> > > Reference: commit c4860af88d0c ("PCI: qcom: Add basic interconnect
> > > support").
> > > Signed-off-by: Krishna chaitanya chundru <quic_krichai@xxxxxxxxxxx>
> > > ---
> > > drivers/pci/controller/dwc/pcie-qcom-ep.c | 73 +++++++++++++++++++++++++++++++
> > > 1 file changed, 73 insertions(+)
> > >
> > > diff --git a/drivers/pci/controller/dwc/pcie-qcom-ep.c b/drivers/pci/controller/dwc/pcie-qcom-ep.c
> > > index 19b3283..5d146ec 100644
> > > --- a/drivers/pci/controller/dwc/pcie-qcom-ep.c
> > > +++ b/drivers/pci/controller/dwc/pcie-qcom-ep.c
[...]
> > > + /*
> > > + * Some Qualcomm platforms require interconnect bandwidth constraints
> > > + * to be set before enabling interconnect clocks.
> > > + *
> > > + * Set an initial average bandwidth corresponding to GEN1x1
> > Keep the comment same as the other driver.
> done
> > > + * for the pcie to mem path.
> > > + */
> > > + ret = icc_set_bw(pcie_ep->icc_mem, 0, MBps_to_icc(PCIE_GEN1_BW_MBPS));
> > > + if (ret) {
> > > + dev_err(pci->dev, "failed to set interconnect bandwidth: %d\n",
> > > + ret);
> > > + goto err_phy_exit;
> > PHY should be powered off in the case of error.
> >
> > Rest looks good.
> >
> > - Mani
>
> For platforms which need ICC it is must to vote for interconnect so better
> to power off in case of error.
>
That's what I'm also suggesting. Currently used err_phy_exit path doesn't power
off the PHY.
- Mani
> -KC
>
> > > + }
> > > +
> > > return 0;
> > > err_phy_exit:
> > > @@ -550,6 +618,10 @@ static int qcom_pcie_ep_get_resources(struct platform_device *pdev,
> > > if (IS_ERR(pcie_ep->phy))
> > > ret = PTR_ERR(pcie_ep->phy);
> > > + pcie_ep->icc_mem = devm_of_icc_get(dev, "pcie-mem");
> > > + if (IS_ERR(pcie_ep->icc_mem))
> > > + ret = PTR_ERR(pcie_ep->icc_mem);
> > > +
> > > return ret;
> > > }
> > > @@ -572,6 +644,7 @@ static irqreturn_t qcom_pcie_ep_global_irq_thread(int irq, void *data)
> > > } else if (FIELD_GET(PARF_INT_ALL_BME, status)) {
> > > dev_dbg(dev, "Received BME event. Link is enabled!\n");
> > > pcie_ep->link_status = QCOM_PCIE_EP_LINK_ENABLED;
> > > + qcom_pcie_ep_icc_update(pcie_ep);
> > > } else if (FIELD_GET(PARF_INT_ALL_PM_TURNOFF, status)) {
> > > dev_dbg(dev, "Received PM Turn-off event! Entering L23\n");
> > > val = readl_relaxed(pcie_ep->parf + PARF_PM_CTRL);
> > > --
> > > 2.7.4
> > >
--
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