phy: qcom-qmp-pcie: Fix high latency with 4x2 PHY when ASPM is enabled

phy: qcom-qmp-pcie: Fix high latency with 4x2 PHY when ASPM is enabled

[ Upstream commit 9ddcd920f8edfe65c3670fbd0b49db00e1e562fe ]

The PCIe QMP 4x2 RC PHY generates high latency when ASPM is enabled. This
seem to be fixed by clearing the QPHY_V5_20_PCS_PCIE_PRESET_P10_POST
register of the pcs_misc register space.

Fixes: 2c91bf6bf290 ("phy: qcom-qmp: Add SM8450 PCIe1 PHY support")
Signed-off-by: Manivannan Sadhasivam <manivannan.sadhasivam@linaro.org>
Link: https://lore.kernel.org/r/20221102081835.41892-1-manivannan.sadhasivam@linaro.org
Signed-off-by: Vinod Koul <vkoul@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>