> On Mon, Nov 18, 2024 at 09:04:57AM +0100, Lorenzo Bianconi wrote: > > Airoha EN7581 has a hw bug asserting/releasing PCIE_PE_RSTB signal > > causing occasional PCIe link down issues. In order to overcome the > > problem, PCIe block is reset using REG_PCI_CONTROL (0x88) and > > REG_RESET_CONTROL (0x834) registers available in the clock module > > running clk_bulk_prepare_enable in mtk_pcie_en7581_power_up(). > > In order to make the code more readable, move the wait for the time > > needed to complete the PCIe reset from en7581_pci_enable() to > > mtk_pcie_en7581_power_up(). > > Reduce reset timeout from 250ms to PCIE_T_PVPERL_MS (100ms). > > > > and this reduced timeout has no impact on the behavior? If so, it'd be good to > state it explicitly. But this information can be added while applying the patch, > so no need to resend just for this. nope, we discussed this here: https://patchwork.kernel.org/project/linux-pci/patch/aca00bd672ee576ad96d279414fc0835ff31f637.1720022580.git.lorenzo@xxxxxxxxxx/#26114968 no worries, I will fix it in v5 since I need to repost to address a comment in patch 3/6. Regards, Lorenzo > > > Reviewed-by: AngeloGioacchino Del Regno <angelogioacchino.delregno@xxxxxxxxxxxxx> > > Signed-off-by: Lorenzo Bianconi <lorenzo@xxxxxxxxxx> > > Reviewed-by: Manivannan Sadhasivam <manivannan.sadhasivam@xxxxxxxxxx> > > - Mani > > > --- > > drivers/clk/clk-en7523.c | 1 - > > drivers/pci/controller/pcie-mediatek-gen3.c | 7 +++++++ > > 2 files changed, 7 insertions(+), 1 deletion(-) > > > > diff --git a/drivers/clk/clk-en7523.c b/drivers/clk/clk-en7523.c > > index 22fbea61c3dcc05e63f8fa37e203c62b2a6fe79e..bf9d9594bef8a54316e28e56a1642ecb0562377a 100644 > > --- a/drivers/clk/clk-en7523.c > > +++ b/drivers/clk/clk-en7523.c > > @@ -393,7 +393,6 @@ static int en7581_pci_enable(struct clk_hw *hw) > > REG_PCI_CONTROL_PERSTOUT; > > val = readl(np_base + REG_PCI_CONTROL); > > writel(val | mask, np_base + REG_PCI_CONTROL); > > - msleep(250); > > > > return 0; > > } > > diff --git a/drivers/pci/controller/pcie-mediatek-gen3.c b/drivers/pci/controller/pcie-mediatek-gen3.c > > index e4f890a73cb8ada7423301fa7a9acc3e177d0cad..f47c0f2995d94ea99bf41146657bd90b87781a7c 100644 > > --- a/drivers/pci/controller/pcie-mediatek-gen3.c > > +++ b/drivers/pci/controller/pcie-mediatek-gen3.c > > @@ -980,6 +980,13 @@ static int mtk_pcie_en7581_power_up(struct mtk_gen3_pcie *pcie) > > goto err_clk_prepare_enable; > > } > > > > + /* > > + * Airoha EN7581 performs PCIe reset via clk callabacks since it has a > > + * hw issue with PCIE_PE_RSTB signal. Add wait for the time needed to > > + * complete the PCIe reset. > > + */ > > + msleep(PCIE_T_PVPERL_MS); > > + > > return 0; > > > > err_clk_prepare_enable: > > > > -- > > 2.47.0 > > > > -- > மணிவண்ணன் சதாசிவம்
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