Messages in this thread | | | Date | Mon, 10 Oct 2022 19:53:52 +0530 | Subject | Re: [PATCH v3 2/5] PCI: tegra194: Move dw_pcie_ep_linkup() to threaded IRQ handler | From | Vidya Sagar <> |
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Hi Mani, Thanks for your change. One comment though.
On 10/6/2022 7:19 PM, Manivannan Sadhasivam wrote: > External email: Use caution opening links or attachments > > > dw_pcie_ep_linkup() may take more time to execute depending on the EPF > driver implementation. Calling this API in the hard IRQ handler is not > encouraged since the hard IRQ handlers are supposed to complete quickly. > > So move the dw_pcie_ep_linkup() call to threaded IRQ handler. > > Signed-off-by: Manivannan Sadhasivam <manivannan.sadhasivam@linaro.org> > --- > drivers/pci/controller/dwc/pcie-tegra194.c | 8 ++++++-- > 1 file changed, 6 insertions(+), 2 deletions(-) > > diff --git a/drivers/pci/controller/dwc/pcie-tegra194.c b/drivers/pci/controller/dwc/pcie-tegra194.c > index 1b6b437823d2..6a487f52e1fb 100644 > --- a/drivers/pci/controller/dwc/pcie-tegra194.c > +++ b/drivers/pci/controller/dwc/pcie-tegra194.c > @@ -287,6 +287,7 @@ struct tegra_pcie_dw { > struct gpio_desc *pex_refclk_sel_gpiod; > unsigned int pex_rst_irq; > int ep_state; > + long link_status; > }; > > static inline struct tegra_pcie_dw *to_tegra_pcie(struct dw_pcie *pci) > @@ -450,9 +451,13 @@ static void pex_ep_event_hot_rst_done(struct tegra_pcie_dw *pcie) > static irqreturn_t tegra_pcie_ep_irq_thread(int irq, void *arg) > { > struct tegra_pcie_dw *pcie = arg; > + struct dw_pcie_ep *ep = &pcie->pci.ep; > struct dw_pcie *pci = &pcie->pci; > u32 val, speed; > > + if (test_and_clear_bit(0, &pcie->link_status)) > + dw_pcie_ep_linkup(ep); > + > speed = dw_pcie_readw_dbi(pci, pcie->pcie_cap_base + PCI_EXP_LNKSTA) & > PCI_EXP_LNKSTA_CLS; > clk_set_rate(pcie->core_clk, pcie_gen_freq[speed - 1]); > @@ -499,7 +504,6 @@ static irqreturn_t tegra_pcie_ep_irq_thread(int irq, void *arg) > static irqreturn_t tegra_pcie_ep_hard_irq(int irq, void *arg) > { > struct tegra_pcie_dw *pcie = arg; > - struct dw_pcie_ep *ep = &pcie->pci.ep; > int spurious = 1; > u32 status_l0, status_l1, link_status; > > @@ -515,7 +519,7 @@ static irqreturn_t tegra_pcie_ep_hard_irq(int irq, void *arg) > link_status = appl_readl(pcie, APPL_LINK_STATUS); > if (link_status & APPL_LINK_STATUS_RDLH_LINK_UP) { > dev_dbg(pcie->dev, "Link is up with Host\n"); > - dw_pcie_ep_linkup(ep); > + set_bit(0, &pcie->link_status);
irq thread needs to be woken up at this point. So, please add return IRQ_WAKE_THREAD;
Thanks, Vidya Sagar
> } > } > > -- > 2.25.1 >
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