[PATCH v2 14/18] PCI: rockchip-ep: Refactor endpoint link training enable

[Damien Le Moal <dlemoal@kernel.org>]

The function rockchip_pcie_init_port() enables link training for a
controller configured in EP mode. Enabling link training is again done
in rockchip_pcie_ep_probe() after that function executed
rockchip_pcie_init_port(). Enabling link training only needs to be done
once, and doing so at the probe stage before the controller is actually
started by the user serves no purpose.

Refactor this by removing the link training enablement from both
rockchip_pcie_init_port() and rockchip_pcie_ep_probe() and moving it to
the endpoint start operation defined with rockchip_pcie_ep_start().
Enabling the controller configuration using the PCIE_CLIENT_CONF_ENABLE
bit in the same PCIE_CLIENT_CONFIG register is also move to
rockchip_pcie_ep_start() and both the controller configuration and link
training enable bits are set with a single call to
rockchip_pcie_write().

Signed-off-by: Damien Le Moal <dlemoal@kernel.org>
---
 drivers/pci/controller/pcie-rockchip-ep.c | 14 ++++++--------
 drivers/pci/controller/pcie-rockchip.c    |  5 +++--
 2 files changed, 9 insertions(+), 10 deletions(-)

diff --git a/drivers/pci/controller/pcie-rockchip-ep.c b/drivers/pci/controller/pcie-rockchip-ep.c
index a7d008d95a8a..9215cac91f61 100644
--- a/drivers/pci/controller/pcie-rockchip-ep.c
+++ b/drivers/pci/controller/pcie-rockchip-ep.c
@@ -461,6 +461,12 @@ static int rockchip_pcie_ep_start(struct pci_epc *epc)
 
 	rockchip_pcie_write(rockchip, cfg, PCIE_CORE_PHY_FUNC_CFG);
 
+	/* Enable configuration and start link training */
+	rockchip_pcie_write(rockchip,
+			    PCIE_CLIENT_LINK_TRAIN_ENABLE |
+			    PCIE_CLIENT_CONF_ENABLE,
+			    PCIE_CLIENT_CONFIG);
+
 	return 0;
 }
 
@@ -539,7 +545,6 @@ static int rockchip_pcie_ep_get_resources(struct rockchip_pcie_ep *ep)
 
 	ep->ob_addr = devm_kcalloc(dev, ep->max_regions, sizeof(*ep->ob_addr),
 				   GFP_KERNEL);
-
 	if (!ep->ob_addr)
 		return -ENOMEM;
 
@@ -650,16 +655,9 @@ static int rockchip_pcie_ep_probe(struct platform_device *pdev)
 
 	rockchip_pcie_ep_hide_msix_cap(rockchip);
 
-	/* Establish the link automatically */
-	rockchip_pcie_write(rockchip, PCIE_CLIENT_LINK_TRAIN_ENABLE,
-			    PCIE_CLIENT_CONFIG);
-
 	/* Only enable function 0 by default */
 	rockchip_pcie_write(rockchip, BIT(0), PCIE_CORE_PHY_FUNC_CFG);
 
-	rockchip_pcie_write(rockchip, PCIE_CLIENT_CONF_ENABLE,
-			    PCIE_CLIENT_CONFIG);
-
 	return 0;
 err_release_resources:
 	rockchip_pcie_ep_release_resources(ep);
diff --git a/drivers/pci/controller/pcie-rockchip.c b/drivers/pci/controller/pcie-rockchip.c
index 0ef2e622d36e..dbec700ba9f9 100644
--- a/drivers/pci/controller/pcie-rockchip.c
+++ b/drivers/pci/controller/pcie-rockchip.c
@@ -244,11 +244,12 @@ int rockchip_pcie_init_port(struct rockchip_pcie *rockchip)
 		rockchip_pcie_write(rockchip, PCIE_CLIENT_GEN_SEL_1,
 				    PCIE_CLIENT_CONFIG);
 
-	regs = PCIE_CLIENT_LINK_TRAIN_ENABLE | PCIE_CLIENT_ARI_ENABLE |
+	regs = PCIE_CLIENT_ARI_ENABLE |
 	       PCIE_CLIENT_CONF_LANE_NUM(rockchip->lanes);
 
 	if (rockchip->is_rc)
-		regs |= PCIE_CLIENT_CONF_ENABLE | PCIE_CLIENT_MODE_RC;
+		regs |= PCIE_CLIENT_LINK_TRAIN_ENABLE |
+			PCIE_CLIENT_CONF_ENABLE | PCIE_CLIENT_MODE_RC;
 	else
 		regs |= PCIE_CLIENT_CONF_DISABLE | PCIE_CLIENT_MODE_EP;
 
-- 
2.44.0