From: Robert Marko robimarko@gmail.com
[ Upstream commit a0e43bb9973b06ce5c666f0901e104e2037c1b34 ]
Currently the Gen2 port in IPQ8074 will cause the system to hang as it accesses DBI registers in qcom_pcie_init_2_3_3(), and those are only accesible after phy_power_on().
Move the DBI read/writes to a new qcom_pcie_post_init_2_3_3(), which is executed after phy_power_on().
Link: https://lore.kernel.org/r/20220623155004.688090-1-robimarko@gmail.com Fixes: a0fd361db8e5 ("PCI: dwc: Move "dbi", "dbi2", and "addr_space" resource setup into common code") Signed-off-by: Robert Marko robimarko@gmail.com Signed-off-by: Bjorn Helgaas bhelgaas@google.com Reviewed-by: Dmitry Baryshkov dmitry.baryshkov@linaro.org Cc: stable@vger.kernel.org # v5.11+ Signed-off-by: Sasha Levin sashal@kernel.org --- drivers/pci/controller/dwc/pcie-qcom.c | 48 +++++++++++++++----------- 1 file changed, 28 insertions(+), 20 deletions(-)
diff --git a/drivers/pci/controller/dwc/pcie-qcom.c b/drivers/pci/controller/dwc/pcie-qcom.c index 45210c6380b1..4c599699e3c8 100644 --- a/drivers/pci/controller/dwc/pcie-qcom.c +++ b/drivers/pci/controller/dwc/pcie-qcom.c @@ -1024,9 +1024,7 @@ static int qcom_pcie_init_2_3_3(struct qcom_pcie *pcie) struct qcom_pcie_resources_2_3_3 *res = &pcie->res.v2_3_3; struct dw_pcie *pci = pcie->pci; struct device *dev = pci->dev; - u16 offset = dw_pcie_find_capability(pci, PCI_CAP_ID_EXP); int i, ret; - u32 val;
for (i = 0; i < ARRAY_SIZE(res->rst); i++) { ret = reset_control_assert(res->rst[i]); @@ -1083,6 +1081,33 @@ static int qcom_pcie_init_2_3_3(struct qcom_pcie *pcie) goto err_clk_aux; }
+ return 0; + +err_clk_aux: + clk_disable_unprepare(res->ahb_clk); +err_clk_ahb: + clk_disable_unprepare(res->axi_s_clk); +err_clk_axi_s: + clk_disable_unprepare(res->axi_m_clk); +err_clk_axi_m: + clk_disable_unprepare(res->iface); +err_clk_iface: + /* + * Not checking for failure, will anyway return + * the original failure in 'ret'. + */ + for (i = 0; i < ARRAY_SIZE(res->rst); i++) + reset_control_assert(res->rst[i]); + + return ret; +} + +static int qcom_pcie_post_init_2_3_3(struct qcom_pcie *pcie) +{ + struct dw_pcie *pci = pcie->pci; + u16 offset = dw_pcie_find_capability(pci, PCI_CAP_ID_EXP); + u32 val; + writel(SLV_ADDR_SPACE_SZ, pcie->parf + PCIE20_v3_PARF_SLV_ADDR_SPACE_SIZE);
@@ -1110,24 +1135,6 @@ static int qcom_pcie_init_2_3_3(struct qcom_pcie *pcie) PCI_EXP_DEVCTL2);
return 0; - -err_clk_aux: - clk_disable_unprepare(res->ahb_clk); -err_clk_ahb: - clk_disable_unprepare(res->axi_s_clk); -err_clk_axi_s: - clk_disable_unprepare(res->axi_m_clk); -err_clk_axi_m: - clk_disable_unprepare(res->iface); -err_clk_iface: - /* - * Not checking for failure, will anyway return - * the original failure in 'ret'. - */ - for (i = 0; i < ARRAY_SIZE(res->rst); i++) - reset_control_assert(res->rst[i]); - - return ret; }
static int qcom_pcie_get_resources_2_7_0(struct qcom_pcie *pcie) @@ -1423,6 +1430,7 @@ static const struct qcom_pcie_ops ops_2_4_0 = { static const struct qcom_pcie_ops ops_2_3_3 = { .get_resources = qcom_pcie_get_resources_2_3_3, .init = qcom_pcie_init_2_3_3, + .post_init = qcom_pcie_post_init_2_3_3, .deinit = qcom_pcie_deinit_2_3_3, .ltssm_enable = qcom_pcie_2_3_2_ltssm_enable, };