You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
172 lines
5.6 KiB
172 lines
5.6 KiB
From 999db52750c062708532e1357ea3942cc619794f Mon Sep 17 00:00:00 2001
|
|
From: Eric Anholt <eric@anholt.net>
|
|
Date: Wed, 18 Jan 2017 07:31:55 +1100
|
|
Subject: [PATCH] clk: bcm2835: Don't rate change PLLs on behalf of DSI PLL
|
|
dividers.
|
|
|
|
Our core PLLs are intended to be configured once and left alone. With
|
|
the SET_RATE_PARENT, asking to set the PLLD_DSI1 clock rate would
|
|
change PLLD just to get closer to the requested DSI clock, thus
|
|
changing PLLD_PER, the UART and ethernet PHY clock rates downstream of
|
|
it, and breaking ethernet.
|
|
|
|
We *do* want PLLH to change so that PLLH_AUX can be exactly the value
|
|
we want, though. Thus, we need to have a per-divider policy of
|
|
whether to pass rate changes up.
|
|
|
|
Signed-off-by: Eric Anholt <eric@anholt.net>
|
|
Signed-off-by: Stephen Boyd <sboyd@codeaurora.org>
|
|
(cherry picked from commit 55486091bd1e1c5ed28c43c0d6b3392468a9adb5)
|
|
---
|
|
drivers/clk/bcm/clk-bcm2835.c | 42 ++++++++++++++++++++++++++++--------------
|
|
1 file changed, 28 insertions(+), 14 deletions(-)
|
|
|
|
--- a/drivers/clk/bcm/clk-bcm2835.c
|
|
+++ b/drivers/clk/bcm/clk-bcm2835.c
|
|
@@ -428,6 +428,7 @@ struct bcm2835_pll_divider_data {
|
|
u32 load_mask;
|
|
u32 hold_mask;
|
|
u32 fixed_divider;
|
|
+ u32 flags;
|
|
};
|
|
|
|
struct bcm2835_clock_data {
|
|
@@ -1258,7 +1259,7 @@ bcm2835_register_pll_divider(struct bcm2
|
|
init.num_parents = 1;
|
|
init.name = divider_name;
|
|
init.ops = &bcm2835_pll_divider_clk_ops;
|
|
- init.flags = CLK_SET_RATE_PARENT | CLK_IGNORE_UNUSED;
|
|
+ init.flags = data->flags | CLK_IGNORE_UNUSED;
|
|
|
|
divider = devm_kzalloc(cprman->dev, sizeof(*divider), GFP_KERNEL);
|
|
if (!divider)
|
|
@@ -1481,7 +1482,8 @@ static const struct bcm2835_clk_desc clk
|
|
.a2w_reg = A2W_PLLA_CORE,
|
|
.load_mask = CM_PLLA_LOADCORE,
|
|
.hold_mask = CM_PLLA_HOLDCORE,
|
|
- .fixed_divider = 1),
|
|
+ .fixed_divider = 1,
|
|
+ .flags = CLK_SET_RATE_PARENT),
|
|
[BCM2835_PLLA_PER] = REGISTER_PLL_DIV(
|
|
.name = "plla_per",
|
|
.source_pll = "plla",
|
|
@@ -1489,7 +1491,8 @@ static const struct bcm2835_clk_desc clk
|
|
.a2w_reg = A2W_PLLA_PER,
|
|
.load_mask = CM_PLLA_LOADPER,
|
|
.hold_mask = CM_PLLA_HOLDPER,
|
|
- .fixed_divider = 1),
|
|
+ .fixed_divider = 1,
|
|
+ .flags = CLK_SET_RATE_PARENT),
|
|
[BCM2835_PLLA_DSI0] = REGISTER_PLL_DIV(
|
|
.name = "plla_dsi0",
|
|
.source_pll = "plla",
|
|
@@ -1505,7 +1508,8 @@ static const struct bcm2835_clk_desc clk
|
|
.a2w_reg = A2W_PLLA_CCP2,
|
|
.load_mask = CM_PLLA_LOADCCP2,
|
|
.hold_mask = CM_PLLA_HOLDCCP2,
|
|
- .fixed_divider = 1),
|
|
+ .fixed_divider = 1,
|
|
+ .flags = CLK_SET_RATE_PARENT),
|
|
|
|
/* PLLB is used for the ARM's clock. */
|
|
[BCM2835_PLLB] = REGISTER_PLL(
|
|
@@ -1529,7 +1533,8 @@ static const struct bcm2835_clk_desc clk
|
|
.a2w_reg = A2W_PLLB_ARM,
|
|
.load_mask = CM_PLLB_LOADARM,
|
|
.hold_mask = CM_PLLB_HOLDARM,
|
|
- .fixed_divider = 1),
|
|
+ .fixed_divider = 1,
|
|
+ .flags = CLK_SET_RATE_PARENT),
|
|
|
|
/*
|
|
* PLLC is the core PLL, used to drive the core VPU clock.
|
|
@@ -1558,7 +1563,8 @@ static const struct bcm2835_clk_desc clk
|
|
.a2w_reg = A2W_PLLC_CORE0,
|
|
.load_mask = CM_PLLC_LOADCORE0,
|
|
.hold_mask = CM_PLLC_HOLDCORE0,
|
|
- .fixed_divider = 1),
|
|
+ .fixed_divider = 1,
|
|
+ .flags = CLK_SET_RATE_PARENT),
|
|
[BCM2835_PLLC_CORE1] = REGISTER_PLL_DIV(
|
|
.name = "pllc_core1",
|
|
.source_pll = "pllc",
|
|
@@ -1566,7 +1572,8 @@ static const struct bcm2835_clk_desc clk
|
|
.a2w_reg = A2W_PLLC_CORE1,
|
|
.load_mask = CM_PLLC_LOADCORE1,
|
|
.hold_mask = CM_PLLC_HOLDCORE1,
|
|
- .fixed_divider = 1),
|
|
+ .fixed_divider = 1,
|
|
+ .flags = CLK_SET_RATE_PARENT),
|
|
[BCM2835_PLLC_CORE2] = REGISTER_PLL_DIV(
|
|
.name = "pllc_core2",
|
|
.source_pll = "pllc",
|
|
@@ -1574,7 +1581,8 @@ static const struct bcm2835_clk_desc clk
|
|
.a2w_reg = A2W_PLLC_CORE2,
|
|
.load_mask = CM_PLLC_LOADCORE2,
|
|
.hold_mask = CM_PLLC_HOLDCORE2,
|
|
- .fixed_divider = 1),
|
|
+ .fixed_divider = 1,
|
|
+ .flags = CLK_SET_RATE_PARENT),
|
|
[BCM2835_PLLC_PER] = REGISTER_PLL_DIV(
|
|
.name = "pllc_per",
|
|
.source_pll = "pllc",
|
|
@@ -1582,7 +1590,8 @@ static const struct bcm2835_clk_desc clk
|
|
.a2w_reg = A2W_PLLC_PER,
|
|
.load_mask = CM_PLLC_LOADPER,
|
|
.hold_mask = CM_PLLC_HOLDPER,
|
|
- .fixed_divider = 1),
|
|
+ .fixed_divider = 1,
|
|
+ .flags = CLK_SET_RATE_PARENT),
|
|
|
|
/*
|
|
* PLLD is the display PLL, used to drive DSI display panels.
|
|
@@ -1611,7 +1620,8 @@ static const struct bcm2835_clk_desc clk
|
|
.a2w_reg = A2W_PLLD_CORE,
|
|
.load_mask = CM_PLLD_LOADCORE,
|
|
.hold_mask = CM_PLLD_HOLDCORE,
|
|
- .fixed_divider = 1),
|
|
+ .fixed_divider = 1,
|
|
+ .flags = CLK_SET_RATE_PARENT),
|
|
[BCM2835_PLLD_PER] = REGISTER_PLL_DIV(
|
|
.name = "plld_per",
|
|
.source_pll = "plld",
|
|
@@ -1619,7 +1629,8 @@ static const struct bcm2835_clk_desc clk
|
|
.a2w_reg = A2W_PLLD_PER,
|
|
.load_mask = CM_PLLD_LOADPER,
|
|
.hold_mask = CM_PLLD_HOLDPER,
|
|
- .fixed_divider = 1),
|
|
+ .fixed_divider = 1,
|
|
+ .flags = CLK_SET_RATE_PARENT),
|
|
[BCM2835_PLLD_DSI0] = REGISTER_PLL_DIV(
|
|
.name = "plld_dsi0",
|
|
.source_pll = "plld",
|
|
@@ -1664,7 +1675,8 @@ static const struct bcm2835_clk_desc clk
|
|
.a2w_reg = A2W_PLLH_RCAL,
|
|
.load_mask = CM_PLLH_LOADRCAL,
|
|
.hold_mask = 0,
|
|
- .fixed_divider = 10),
|
|
+ .fixed_divider = 10,
|
|
+ .flags = CLK_SET_RATE_PARENT),
|
|
[BCM2835_PLLH_AUX] = REGISTER_PLL_DIV(
|
|
.name = "pllh_aux",
|
|
.source_pll = "pllh",
|
|
@@ -1672,7 +1684,8 @@ static const struct bcm2835_clk_desc clk
|
|
.a2w_reg = A2W_PLLH_AUX,
|
|
.load_mask = CM_PLLH_LOADAUX,
|
|
.hold_mask = 0,
|
|
- .fixed_divider = 1),
|
|
+ .fixed_divider = 1,
|
|
+ .flags = CLK_SET_RATE_PARENT),
|
|
[BCM2835_PLLH_PIX] = REGISTER_PLL_DIV(
|
|
.name = "pllh_pix",
|
|
.source_pll = "pllh",
|
|
@@ -1680,7 +1693,8 @@ static const struct bcm2835_clk_desc clk
|
|
.a2w_reg = A2W_PLLH_PIX,
|
|
.load_mask = CM_PLLH_LOADPIX,
|
|
.hold_mask = 0,
|
|
- .fixed_divider = 10),
|
|
+ .fixed_divider = 10,
|
|
+ .flags = CLK_SET_RATE_PARENT),
|
|
|
|
/* the clocks */
|
|
|
|
|