forked from openwrt/openwrt
/
093-4-v5.8-ipq806x-PCI-qcom-Use-bulk-clk-api-and-assert-on-error.patch
228 lines (206 loc) · 6.5 KB
/
093-4-v5.8-ipq806x-PCI-qcom-Use-bulk-clk-api-and-assert-on-error.patch
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
From 6a114526af4689938863bf34976c83bfd279f517 Mon Sep 17 00:00:00 2001
From: Ansuel Smith <ansuelsmth@gmail.com>
Date: Mon, 15 Jun 2020 23:06:02 +0200
Subject: PCI: qcom: Use bulk clk api and assert on error
Rework 2.1.0 revision to use bulk clk api and fix missing assert on
reset_control_deassert error.
Link: https://lore.kernel.org/r/20200615210608.21469-7-ansuelsmth@gmail.com
Signed-off-by: Ansuel Smith <ansuelsmth@gmail.com>
Signed-off-by: Lorenzo Pieralisi <lorenzo.pieralisi@arm.com>
Reviewed-by: Rob Herring <robh@kernel.org>
Acked-by: Stanimir Varbanov <svarbanov@mm-sol.com>
---
drivers/pci/controller/dwc/pcie-qcom.c | 131 ++++++++++++---------------------
1 file changed, 46 insertions(+), 85 deletions(-)
--- a/drivers/pci/controller/dwc/pcie-qcom.c
+++ b/drivers/pci/controller/dwc/pcie-qcom.c
@@ -99,12 +99,9 @@
#define SLV_ADDR_SPACE_SZ 0x10000000
#define QCOM_PCIE_2_1_0_MAX_SUPPLY 3
+#define QCOM_PCIE_2_1_0_MAX_CLOCKS 5
struct qcom_pcie_resources_2_1_0 {
- struct clk *iface_clk;
- struct clk *core_clk;
- struct clk *phy_clk;
- struct clk *aux_clk;
- struct clk *ref_clk;
+ struct clk_bulk_data clks[QCOM_PCIE_2_1_0_MAX_CLOCKS];
struct reset_control *pci_reset;
struct reset_control *axi_reset;
struct reset_control *ahb_reset;
@@ -244,25 +241,21 @@ static int qcom_pcie_get_resources_2_1_0
if (ret)
return ret;
- res->iface_clk = devm_clk_get(dev, "iface");
- if (IS_ERR(res->iface_clk))
- return PTR_ERR(res->iface_clk);
-
- res->core_clk = devm_clk_get(dev, "core");
- if (IS_ERR(res->core_clk))
- return PTR_ERR(res->core_clk);
-
- res->phy_clk = devm_clk_get(dev, "phy");
- if (IS_ERR(res->phy_clk))
- return PTR_ERR(res->phy_clk);
-
- res->aux_clk = devm_clk_get_optional(dev, "aux");
- if (IS_ERR(res->aux_clk))
- return PTR_ERR(res->aux_clk);
-
- res->ref_clk = devm_clk_get_optional(dev, "ref");
- if (IS_ERR(res->ref_clk))
- return PTR_ERR(res->ref_clk);
+ res->clks[0].id = "iface";
+ res->clks[1].id = "core";
+ res->clks[2].id = "phy";
+ res->clks[3].id = "aux";
+ res->clks[4].id = "ref";
+
+ /* iface, core, phy are required */
+ ret = devm_clk_bulk_get(dev, 3, res->clks);
+ if (ret < 0)
+ return ret;
+
+ /* aux, ref are optional */
+ ret = devm_clk_bulk_get_optional(dev, 2, res->clks + 3);
+ if (ret < 0)
+ return ret;
res->pci_reset = devm_reset_control_get_exclusive(dev, "pci");
if (IS_ERR(res->pci_reset))
@@ -292,17 +285,13 @@ 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);
+ clk_bulk_disable_unprepare(ARRAY_SIZE(res->clks), res->clks);
reset_control_assert(res->pci_reset);
reset_control_assert(res->axi_reset);
reset_control_assert(res->ahb_reset);
reset_control_assert(res->por_reset);
reset_control_assert(res->ext_reset);
reset_control_assert(res->phy_reset);
- clk_disable_unprepare(res->iface_clk);
- clk_disable_unprepare(res->core_clk);
- clk_disable_unprepare(res->aux_clk);
- clk_disable_unprepare(res->ref_clk);
writel(1, pcie->parf + PCIE20_PARF_PHY_CTRL);
@@ -334,47 +323,45 @@ static int qcom_pcie_init_2_1_0(struct q
return ret;
}
- ret = reset_control_assert(res->ahb_reset);
+ ret = reset_control_deassert(res->ahb_reset);
if (ret) {
- dev_err(dev, "cannot assert ahb reset\n");
- goto err_assert_ahb;
+ dev_err(dev, "cannot deassert ahb reset\n");
+ goto err_deassert_ahb;
}
- ret = clk_prepare_enable(res->iface_clk);
+ ret = reset_control_deassert(res->ext_reset);
if (ret) {
- dev_err(dev, "cannot prepare/enable iface clock\n");
- goto err_assert_ahb;
+ dev_err(dev, "cannot deassert ext reset\n");
+ goto err_deassert_ext;
}
- ret = clk_prepare_enable(res->core_clk);
+ ret = reset_control_deassert(res->phy_reset);
if (ret) {
- dev_err(dev, "cannot prepare/enable core clock\n");
- goto err_clk_core;
+ dev_err(dev, "cannot deassert phy reset\n");
+ goto err_deassert_phy;
}
- ret = clk_prepare_enable(res->aux_clk);
+ ret = reset_control_deassert(res->pci_reset);
if (ret) {
- dev_err(dev, "cannot prepare/enable aux clock\n");
- goto err_clk_aux;
+ dev_err(dev, "cannot deassert pci reset\n");
+ goto err_deassert_pci;
}
- ret = clk_prepare_enable(res->ref_clk);
+ ret = reset_control_deassert(res->por_reset);
if (ret) {
- dev_err(dev, "cannot prepare/enable ref clock\n");
- goto err_clk_ref;
+ dev_err(dev, "cannot deassert por reset\n");
+ goto err_deassert_por;
}
- ret = reset_control_deassert(res->ahb_reset);
+ ret = reset_control_deassert(res->axi_reset);
if (ret) {
- dev_err(dev, "cannot deassert ahb reset\n");
- goto err_deassert_ahb;
+ dev_err(dev, "cannot deassert axi reset\n");
+ goto err_deassert_axi;
}
- ret = reset_control_deassert(res->ext_reset);
- if (ret) {
- dev_err(dev, "cannot deassert ext reset\n");
- goto err_deassert_ahb;
- }
+ ret = clk_bulk_prepare_enable(ARRAY_SIZE(res->clks), res->clks);
+ if (ret)
+ goto err_clks;
/* enable PCIe clocks and resets */
val = readl(pcie->parf + PCIE20_PARF_PHY_CTRL);
@@ -406,36 +393,6 @@ static int qcom_pcie_init_2_1_0(struct q
val |= PHY_REFCLK_SSP_EN;
writel(val, pcie->parf + PCIE20_PARF_PHY_REFCLK);
- ret = reset_control_deassert(res->phy_reset);
- if (ret) {
- dev_err(dev, "cannot deassert phy reset\n");
- return ret;
- }
-
- ret = reset_control_deassert(res->pci_reset);
- if (ret) {
- dev_err(dev, "cannot deassert pci reset\n");
- return ret;
- }
-
- ret = reset_control_deassert(res->por_reset);
- if (ret) {
- dev_err(dev, "cannot deassert por reset\n");
- return ret;
- }
-
- ret = reset_control_deassert(res->axi_reset);
- if (ret) {
- dev_err(dev, "cannot deassert axi reset\n");
- 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);
@@ -448,15 +405,19 @@ static int qcom_pcie_init_2_1_0(struct q
return 0;
+err_clks:
+ reset_control_assert(res->axi_reset);
+err_deassert_axi:
+ reset_control_assert(res->por_reset);
+err_deassert_por:
+ reset_control_assert(res->pci_reset);
+err_deassert_pci:
+ reset_control_assert(res->phy_reset);
+err_deassert_phy:
+ reset_control_assert(res->ext_reset);
+err_deassert_ext:
+ reset_control_assert(res->ahb_reset);
err_deassert_ahb:
- clk_disable_unprepare(res->ref_clk);
-err_clk_ref:
- clk_disable_unprepare(res->aux_clk);
-err_clk_aux:
- clk_disable_unprepare(res->core_clk);
-err_clk_core:
- clk_disable_unprepare(res->iface_clk);
-err_assert_ahb:
regulator_bulk_disable(ARRAY_SIZE(res->supplies), res->supplies);
return ret;