467b07e00c
Refreshed all patches Compile-tested on: cns3xxx, imx6, x86_64 Runtime-tested on: cns3xxx, imx6, x86_64 Signed-off-by: Koen Vandeputte <koen.vandeputte@ncentric.com> Tested-by: Michael Yartys <michael.yartys@protonmail.com>
91 lines
3.2 KiB
Diff
91 lines
3.2 KiB
Diff
From b74bab6186131eea09459eedf5d737645a3559c9 Mon Sep 17 00:00:00 2001
|
|
From: Abhishek Sahu <absahu@codeaurora.org>
|
|
Date: Thu, 22 Dec 2016 11:18:45 +0530
|
|
Subject: pcie: qcom: Fixed pcie_phy_clk branch issue
|
|
|
|
Following backtraces are observed in PCIe deinit operation.
|
|
|
|
Hardware name: Qualcomm (Flattened Device Tree)
|
|
(unwind_backtrace) from [] (show_stack+0x10/0x14)
|
|
(show_stack) from [] (dump_stack+0x84/0x98)
|
|
(dump_stack) from [] (warn_slowpath_common+0x9c/0xb8)
|
|
(warn_slowpath_common) from [] (warn_slowpath_fmt+0x30/0x40)
|
|
(warn_slowpath_fmt) from [] (clk_branch_wait+0x114/0x120)
|
|
(clk_branch_wait) from [] (clk_core_disable+0xd0/0x1f4)
|
|
(clk_core_disable) from [] (clk_disable+0x24/0x30)
|
|
(clk_disable) from [] (qcom_pcie_deinit_v0+0x6c/0xb8)
|
|
(qcom_pcie_deinit_v0) from [] (qcom_pcie_host_init+0xe0/0xe8)
|
|
(qcom_pcie_host_init) from [] (dw_pcie_host_init+0x3b0/0x538)
|
|
(dw_pcie_host_init) from [] (qcom_pcie_probe+0x20c/0x2e4)
|
|
|
|
pcie_phy_clk is generated for PCIe controller itself and the
|
|
GCC controls its branch operation. This error is coming since
|
|
the assert operations turn off the parent clock before branch
|
|
clock. Now this patch moves clk_disable_unprepare before assert
|
|
operations.
|
|
|
|
Similarly, during probe function, the clock branch operation
|
|
should be done after dessert operation. Currently, it does not
|
|
generate any error since bootloader enables the pcie_phy_clk
|
|
but the same error is coming during probe, if bootloader
|
|
disables pcie_phy_clk.
|
|
|
|
Change-Id: Ib29c154d10eb64363d9cc982ce5fd8107af5627d
|
|
Signed-off-by: Abhishek Sahu <absahu@codeaurora.org>
|
|
---
|
|
drivers/pci/host/pcie-qcom.c | 16 +++++++---------
|
|
1 file changed, 7 insertions(+), 9 deletions(-)
|
|
|
|
--- a/drivers/pci/dwc/pcie-qcom.c
|
|
+++ b/drivers/pci/dwc/pcie-qcom.c
|
|
@@ -407,6 +407,7 @@ static void qcom_pcie_deinit_2_1_0(struc
|
|
{
|
|
struct qcom_pcie_resources_2_1_0 *res = &pcie->res.v2_1_0;
|
|
|
|
+ clk_disable_unprepare(res->phy_clk);
|
|
reset_control_assert(res->pci_reset);
|
|
reset_control_assert(res->axi_reset);
|
|
reset_control_assert(res->ahb_reset);
|
|
@@ -415,7 +416,6 @@ static void qcom_pcie_deinit_2_1_0(struc
|
|
reset_control_assert(res->ext_reset);
|
|
clk_disable_unprepare(res->iface_clk);
|
|
clk_disable_unprepare(res->core_clk);
|
|
- clk_disable_unprepare(res->phy_clk);
|
|
clk_disable_unprepare(res->aux_clk);
|
|
clk_disable_unprepare(res->ref_clk);
|
|
regulator_disable(res->vdda);
|
|
@@ -472,12 +472,6 @@ static int qcom_pcie_init_2_1_0(struct q
|
|
goto err_clk_core;
|
|
}
|
|
|
|
- ret = clk_prepare_enable(res->phy_clk);
|
|
- if (ret) {
|
|
- dev_err(dev, "cannot prepare/enable phy clock\n");
|
|
- goto err_clk_phy;
|
|
- }
|
|
-
|
|
ret = clk_prepare_enable(res->aux_clk);
|
|
if (ret) {
|
|
dev_err(dev, "cannot prepare/enable aux clock\n");
|
|
@@ -541,6 +535,12 @@ static int qcom_pcie_init_2_1_0(struct q
|
|
return ret;
|
|
}
|
|
|
|
+ ret = clk_prepare_enable(res->phy_clk);
|
|
+ if (ret) {
|
|
+ dev_err(dev, "cannot prepare/enable phy clock\n");
|
|
+ goto err_deassert_ahb;
|
|
+ }
|
|
+
|
|
/* wait for clock acquisition */
|
|
usleep_range(1000, 1500);
|
|
if (pcie->force_gen1) {
|
|
@@ -566,8 +566,6 @@ err_deassert_ahb:
|
|
err_clk_ref:
|
|
clk_disable_unprepare(res->aux_clk);
|
|
err_clk_aux:
|
|
- clk_disable_unprepare(res->phy_clk);
|
|
-err_clk_phy:
|
|
clk_disable_unprepare(res->core_clk);
|
|
err_clk_core:
|
|
clk_disable_unprepare(res->iface_clk);
|