diff mbox series

[RESEND,v3,2/2] PCI: brcmstb: use reset/rearm instead of deassert/assert

Message ID 20201216214106.32851-3-james.quinlan@broadcom.com
State New
Headers show
Series ata: ahci_brcm: Fix use of BCM7216 reset controller | expand

Commit Message

Jim Quinlan Dec. 16, 2020, 9:41 p.m. UTC 
The Brcmstb PCIe RC uses a reset control "rescal" for certain chips.  This
reset implements a "pulse reset" so it matches more the reset/rearm
calls instead of the deassert/assert calls.

Also, add reset_control calls in suspend/resume functions.

Signed-off-by: Jim Quinlan <james.quinlan@broadcom.com>
---
 drivers/pci/controller/pcie-brcmstb.c | 19 +++++++++++++------
 1 file changed, 13 insertions(+), 6 deletions(-)

Comments

Florian Fainelli Dec. 16, 2020, 10:02 p.m. UTC | #1 
On 12/16/20 1:41 PM, Jim Quinlan wrote:
> The Brcmstb PCIe RC uses a reset control "rescal" for certain chips.  This
> reset implements a "pulse reset" so it matches more the reset/rearm
> calls instead of the deassert/assert calls.
> 
> Also, add reset_control calls in suspend/resume functions.
> 
> Signed-off-by: Jim Quinlan <james.quinlan@broadcom.com>

This should probably deserve a Fixes tag as well:

Fixes: 740d6c3708a9 ("PCI: brcmstb: Add control of rescal reset")
Acked-by: Florian Fainelli <f.fainelli@gmail.com>

Thanks!
diff mbox series

Patch

diff --git a/drivers/pci/controller/pcie-brcmstb.c b/drivers/pci/controller/pcie-brcmstb.c
index d41257f43a8f..9f190db4cfcf 100644
--- a/drivers/pci/controller/pcie-brcmstb.c
+++ b/drivers/pci/controller/pcie-brcmstb.c
@@ -1127,6 +1127,7 @@  static int brcm_pcie_suspend(struct device *dev)
 
 	brcm_pcie_turn_off(pcie);
 	ret = brcm_phy_stop(pcie);
+	reset_control_rearm(pcie->rescal);
 	clk_disable_unprepare(pcie->clk);
 
 	return ret;
@@ -1142,9 +1143,13 @@  static int brcm_pcie_resume(struct device *dev)
 	base = pcie->base;
 	clk_prepare_enable(pcie->clk);
 
+	ret = reset_control_reset(pcie->rescal);
+	if (ret)
+		goto err0;
+
 	ret = brcm_phy_start(pcie);
 	if (ret)
-		goto err;
+		goto err1;
 
 	/* Take bridge out of reset so we can access the SERDES reg */
 	pcie->bridge_sw_init_set(pcie, 0);
@@ -1159,14 +1164,16 @@  static int brcm_pcie_resume(struct device *dev)
 
 	ret = brcm_pcie_setup(pcie);
 	if (ret)
-		goto err;
+		goto err1;
 
 	if (pcie->msi)
 		brcm_msi_set_regs(pcie->msi);
 
 	return 0;
 
-err:
+err1:
+	reset_control_rearm(pcie->rescal);
+err0:
 	clk_disable_unprepare(pcie->clk);
 	return ret;
 }
@@ -1176,7 +1183,7 @@  static void __brcm_pcie_remove(struct brcm_pcie *pcie)
 	brcm_msi_remove(pcie);
 	brcm_pcie_turn_off(pcie);
 	brcm_phy_stop(pcie);
-	reset_control_assert(pcie->rescal);
+	reset_control_rearm(pcie->rescal);
 	clk_disable_unprepare(pcie->clk);
 }
 
@@ -1251,13 +1258,13 @@  static int brcm_pcie_probe(struct platform_device *pdev)
 		return PTR_ERR(pcie->rescal);
 	}
 
-	ret = reset_control_deassert(pcie->rescal);
+	ret = reset_control_reset(pcie->rescal);
 	if (ret)
 		dev_err(&pdev->dev, "failed to deassert 'rescal'\n");
 
 	ret = brcm_phy_start(pcie);
 	if (ret) {
-		reset_control_assert(pcie->rescal);
+		reset_control_rearm(pcie->rescal);
 		clk_disable_unprepare(pcie->clk);
 		return ret;
 	}