Add a comment in mtk_pcie_en7581_power_up() to clarify, unlike MediaTek
PCIe controller, the Airoha EN7581 requires PHY initialization and
power-on before PHY reset deassert.
Reviewed-by: Manivannan Sadhasivam <manivannan.sadhasivam@xxxxxxxxxx>
Signed-off-by: Lorenzo Bianconi <lorenzo@xxxxxxxxxx>
---
drivers/pci/controller/pcie-mediatek-gen3.c | 4 ++++
1 file changed, 4 insertions(+)
diff --git a/drivers/pci/controller/pcie-mediatek-gen3.c b/drivers/pci/controller/pcie-mediatek-gen3.c
index 2b80edd4462ad4e9f2a5d192db7f99307113eb8a..dd30530a43b1097871acc9e76a7534f30819432d 100644
--- a/drivers/pci/controller/pcie-mediatek-gen3.c
+++ b/drivers/pci/controller/pcie-mediatek-gen3.c
@@ -928,6 +928,10 @@ static int mtk_pcie_en7581_power_up(struct mtk_gen3_pcie *pcie)
*/
mdelay(PCIE_EN7581_RESET_TIME_MS);
+ /*
+ * Unlike the MediaTek controllers, the Airoha EN7581 requires PHY
+ * initialization and power-on before PHY reset deassert.
+ */
err = phy_init(pcie->phy);
if (err) {
dev_err(dev, "failed to initialize PHY\n");
--
2.47.0
