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PCI: brcmstb: Use swinit reset if available

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The 7712 SoC adds a software init reset device for the PCIe HW.

If found in the DT node, use it.

Link: https://lore.kernel.org/linux-pci/20240815225731.40276-7-james.quinlan@broadcom.com
Signed-off-by: Jim Quinlan <james.quinlan@broadcom.com>
Signed-off-by: Krzysztof Wilczyński <kwilczynski@kernel.org>
Reviewed-by: Florian Fainelli <florian.fainelli@broadcom.com>
Reviewed-by: Manivannan Sadhasivam <manivannan.sadhasivam@linaro.org>
This commit is contained in:
Jim Quinlan 2024-08-15 18:57:19 -04:00 committed by Krzysztof Wilczyński
parent 46cb27f671
commit 8201360218
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GPG Key ID: 7C64768D3DE334E7
1 changed files with 24 additions and 0 deletions
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24
drivers/pci/controller/pcie-brcmstb.c
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@ -266,6 +266,7 @@ struct brcm_pcie {
struct reset_control *rescal;
struct reset_control *perst_reset;
struct reset_control *bridge_reset;
struct reset_control *swinit_reset;
int num_memc;
u64 memc_size[PCIE_BRCM_MAX_MEMC];
u32 hw_rev;
@ -1635,12 +1636,35 @@ static int brcm_pcie_probe(struct platform_device *pdev)
if (IS_ERR(pcie->bridge_reset))
return PTR_ERR(pcie->bridge_reset);
pcie->swinit_reset = devm_reset_control_get_optional_exclusive(&pdev->dev, "swinit");
if (IS_ERR(pcie->swinit_reset))
return PTR_ERR(pcie->swinit_reset);
ret = clk_prepare_enable(pcie->clk);
if (ret)
return dev_err_probe(&pdev->dev, ret, "could not enable clock\n");
pcie->bridge_sw_init_set(pcie, 0);
if (pcie->swinit_reset) {
ret = reset_control_assert(pcie->swinit_reset);
if (ret) {
clk_disable_unprepare(pcie->clk);
return dev_err_probe(&pdev->dev, ret,
"could not assert reset 'swinit'\n");
}
/* HW team recommends 1us for proper sync and propagation of reset */
udelay(1);
ret = reset_control_deassert(pcie->swinit_reset);
if (ret) {
clk_disable_unprepare(pcie->clk);
return dev_err_probe(&pdev->dev, ret,
"could not de-assert reset 'swinit'\n");
}
}
ret = reset_control_reset(pcie->rescal);
if (ret) {
clk_disable_unprepare(pcie->clk);