[PATCH v4 4/6] PCI: mediatek-gen3: Add comment about initialization order in mtk_pcie_en7581_power_up()

[Lorenzo Bianconi]

Add a comment in mtk_pcie_en7581_power_up() to clarify, unlike the other
MediaTek Gen3 controllers, the Airoha EN7581 requires PHY initialization
and power-on before PHY reset deassert.

Reviewed-by: Manivannan Sadhasivam <manivannan.sadhasivam at linaro.org>
Reviewed-by: AngeloGioacchino Del Regno <angelogioacchino.delregno at collabora.com>
Signed-off-by: Lorenzo Bianconi <lorenzo at kernel.org>
---
 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..e4f890a73cb8ada7423301fa7a9acc3e177d0cad 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 other MediaTek Gen3 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