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Subject[RESEND PATCH v3 2/2] PCI: brcmstb: use reset/rearm instead of deassert/assert
Date
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(-)

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;
}
--
2.17.1
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