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
|
From 5c1128ebe6c7a4af3f1784a640df7f3698233e9d Mon Sep 17 00:00:00 2001
From: Phil Elwell <phil@raspberrypi.org>
Date: Mon, 13 Feb 2017 17:20:08 +0000
Subject: [PATCH] clk-bcm2835: Add claim-clocks property
The claim-clocks property can be used to prevent PLLs and dividers
from being marked as critical. It contains a vector of clock IDs,
as defined by dt-bindings/clock/bcm2835.h.
Use this mechanism to claim PLLD_DSI0, PLLD_DSI1, PLLH_AUX and
PLLH_PIX for the vc4_kms_v3d driver.
Signed-off-by: Phil Elwell <phil@raspberrypi.org>
---
arch/arm/boot/dts/overlays/vc4-kms-v3d-overlay.dts | 14 +++++++++
drivers/clk/bcm/clk-bcm2835.c | 34 ++++++++++++++++++++--
2 files changed, 46 insertions(+), 2 deletions(-)
--- a/arch/arm/boot/dts/overlays/vc4-kms-v3d-overlay.dts
+++ b/arch/arm/boot/dts/overlays/vc4-kms-v3d-overlay.dts
@@ -5,6 +5,8 @@
/dts-v1/;
/plugin/;
+#include <dt-bindings/clock/bcm2835.h>
+
/ {
compatible = "brcm,bcm2835", "brcm,bcm2708", "brcm,bcm2709";
@@ -155,6 +157,18 @@
};
};
+ fragment@19 {
+ target = <&clocks>;
+ __overlay__ {
+ claim-clocks = <
+ BCM2835_PLLD_DSI0
+ BCM2835_PLLD_DSI1
+ BCM2835_PLLH_AUX
+ BCM2835_PLLH_PIX
+ >;
+ };
+ };
+
__overrides__ {
cma-256 = <0>,"+0-1-2-3-4";
cma-192 = <0>,"-0+1-2-3-4";
--- a/drivers/clk/bcm/clk-bcm2835.c
+++ b/drivers/clk/bcm/clk-bcm2835.c
@@ -1304,6 +1304,8 @@ static const struct clk_ops bcm2835_vpu_
.debug_init = bcm2835_clock_debug_init,
};
+static bool bcm2835_clk_is_claimed(const char *name);
+
static struct clk_hw *bcm2835_register_pll(struct bcm2835_cprman *cprman,
const struct bcm2835_pll_data *data)
{
@@ -1320,6 +1322,9 @@ static struct clk_hw *bcm2835_register_p
init.ops = &bcm2835_pll_clk_ops;
init.flags = CLK_IGNORE_UNUSED;
+ if (!bcm2835_clk_is_claimed(data->name))
+ init.flags |= CLK_IS_CRITICAL;
+
pll = kzalloc(sizeof(*pll), GFP_KERNEL);
if (!pll)
return NULL;
@@ -1373,8 +1378,10 @@ bcm2835_register_pll_divider(struct bcm2
divider->div.table = NULL;
if (!(cprman_read(cprman, data->cm_reg) & data->hold_mask)) {
- init.flags |= CLK_IS_CRITICAL;
- divider->div.flags |= CLK_IS_CRITICAL;
+ if (!bcm2835_clk_is_claimed(data->source_pll))
+ init.flags |= CLK_IS_CRITICAL;
+ if (!bcm2835_clk_is_claimed(data->name))
+ divider->div.flags |= CLK_IS_CRITICAL;
}
divider->cprman = cprman;
@@ -2110,6 +2117,8 @@ static const struct bcm2835_clk_desc clk
.ctl_reg = CM_PERIICTL),
};
+static bool bcm2835_clk_claimed[ARRAY_SIZE(clk_desc_array)];
+
/*
* Permanently take a reference on the parent of the SDRAM clock.
*
@@ -2129,6 +2138,19 @@ static int bcm2835_mark_sdc_parent_criti
return clk_prepare_enable(parent);
}
+static bool bcm2835_clk_is_claimed(const char *name)
+{
+ int i;
+
+ for (i = 0; i < ARRAY_SIZE(clk_desc_array); i++) {
+ const char *clk_name = *(const char **)(clk_desc_array[i].data);
+ if (!strcmp(name, clk_name))
+ return bcm2835_clk_claimed[i];
+ }
+
+ return false;
+}
+
static int bcm2835_clk_probe(struct platform_device *pdev)
{
struct device *dev = &pdev->dev;
@@ -2138,6 +2160,7 @@ static int bcm2835_clk_probe(struct plat
const struct bcm2835_clk_desc *desc;
const size_t asize = ARRAY_SIZE(clk_desc_array);
size_t i;
+ u32 clk_id;
int ret;
cprman = devm_kzalloc(dev, sizeof(*cprman) +
@@ -2153,6 +2176,13 @@ static int bcm2835_clk_probe(struct plat
if (IS_ERR(cprman->regs))
return PTR_ERR(cprman->regs);
+ memset(bcm2835_clk_claimed, 0, sizeof(bcm2835_clk_claimed));
+ for (i = 0;
+ !of_property_read_u32_index(pdev->dev.of_node, "claim-clocks",
+ i, &clk_id);
+ i++)
+ bcm2835_clk_claimed[clk_id]= true;
+
memcpy(cprman->real_parent_names, cprman_parent_names,
sizeof(cprman_parent_names));
of_clk_parent_fill(dev->of_node, cprman->real_parent_names,
|
