[PATCH v2 2/5] PCI: brcmstb: Wait for 100ms following PERST# deassert

[Jim Quinlan]

Be prudent and give some time for power and clocks to become stable.  As
described in the PCIe CEM specification sections 2.2 and 2.2.1; as well as
PCIe r5.0, 6.6.1.

Signed-off-by: Jim Quinlan <jim2101024 at gmail.com>
Acked-by: Florian Fainelli <f.fainelli at gmail.com>
---
 drivers/pci/controller/pcie-brcmstb.c | 11 +++++++++--
 1 file changed, 9 insertions(+), 2 deletions(-)

diff --git a/drivers/pci/controller/pcie-brcmstb.c b/drivers/pci/controller/pcie-brcmstb.c
index a45ce7d61847..39b545713ba0 100644
--- a/drivers/pci/controller/pcie-brcmstb.c
+++ b/drivers/pci/controller/pcie-brcmstb.c
@@ -1037,8 +1037,15 @@ static int brcm_pcie_start_link(struct brcm_pcie *pcie)
 	pcie->perst_set(pcie, 0);
 
 	/*
-	 * Give the RC/EP time to wake up, before trying to configure RC.
-	 * Intermittently check status for link-up, up to a total of 100ms.
+	 * Wait for 100ms after PERST# deassertion; see PCIe CEM specification
+	 * sections 2.2, PCIe r5.0, 6.6.1.
+	 */
+	msleep(100);
+
+	/*
+	 * Give the RC/EP even more time to wake up, before trying to
+	 * configure RC.  Intermittently check status for link-up, up to a
+	 * total of 100ms.
 	 */
 	for (i = 0; i < 100 && !brcm_pcie_link_up(pcie); i += 5)
 		msleep(5);
-- 
2.17.1