If you repost this series, here are a few comments/typos. Otherwise we can do the trivial updates on the branch. In subject: this patch doesn't *add* a delay; it *moves* it. On Sat, Nov 30, 2024 at 12:20:14AM +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(). Add parens after clk_bulk_prepare_enable. > 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 the standard PCIE_T_PVPERL_MS value > (100ms) since it has no impact on the driver behavior. > > Reviewed-by: AngeloGioacchino Del Regno <angelogioacchino.delregno@xxxxxxxxxxxxx> > Acked-by: Stephen Boyd <sboyd@xxxxxxxxxx> > Reviewed-by: Manivannan Sadhasivam <manivannan.sadhasivam@xxxxxxxxxx> > Signed-off-by: Lorenzo Bianconi <lorenzo@xxxxxxxxxx> > --- > 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 01e8fde96080fa55f6c23c7d1baab6e22c49fcff..da01e741ff290464d28e172879520dbe0670cc41 100644 > --- a/drivers/pci/controller/pcie-mediatek-gen3.c > +++ b/drivers/pci/controller/pcie-mediatek-gen3.c > @@ -977,6 +977,13 @@ 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. s/callabacks/callbacks/ > + */ > + msleep(PCIE_T_PVPERL_MS); > + > return 0; > > err_clk_prepare_enable: > > -- > 2.47.0 >
