* [PATCH] clk: tegra: Add missing spinlock for hclk and pclk
@ 2013-02-07 16:37 Peter De Schrijver
2013-02-07 17:49 ` Mike Turquette
2013-02-08 5:23 ` Prashant Gaikwad
0 siblings, 2 replies; 4+ messages in thread
From: Peter De Schrijver @ 2013-02-07 16:37 UTC (permalink / raw)
To: pdeschrijver
Cc: Stephen Warren, Mike Turquette, Prashant Gaikwad, Joseph Lo,
linux-kernel
The hclk and pclk clocks are controlled by the same register. Hence a lock is
required to avoid corruption.
Signed-off-by: Peter De Schrijver <pdeschrijver@nvidia.com>
---
drivers/clk/tegra/clk-tegra20.c | 11 +++++++----
drivers/clk/tegra/clk-tegra30.c | 11 +++++++----
2 files changed, 14 insertions(+), 8 deletions(-)
diff --git a/drivers/clk/tegra/clk-tegra20.c b/drivers/clk/tegra/clk-tegra20.c
index 5d41569..4612b2e 100644
--- a/drivers/clk/tegra/clk-tegra20.c
+++ b/drivers/clk/tegra/clk-tegra20.c
@@ -194,6 +194,7 @@ static void __iomem *clk_base;
static void __iomem *pmc_base;
static DEFINE_SPINLOCK(pll_div_lock);
+static DEFINE_SPINLOCK(sysrate_lock);
#define TEGRA_INIT_DATA_MUX(_name, _con_id, _dev_id, _parents, _offset, \
_clk_num, _regs, _gate_flags, _clk_id) \
@@ -768,19 +769,21 @@ static void tegra20_super_clk_init(void)
/* HCLK */
clk = clk_register_divider(NULL, "hclk_div", "sclk", 0,
- clk_base + CLK_SYSTEM_RATE, 4, 2, 0, NULL);
+ clk_base + CLK_SYSTEM_RATE, 4, 2, 0,
+ &sysrate_lock);
clk = clk_register_gate(NULL, "hclk", "hclk_div", CLK_SET_RATE_PARENT,
clk_base + CLK_SYSTEM_RATE, 7,
- CLK_GATE_SET_TO_DISABLE, NULL);
+ CLK_GATE_SET_TO_DISABLE, &sysrate_lock);
clk_register_clkdev(clk, "hclk", NULL);
clks[hclk] = clk;
/* PCLK */
clk = clk_register_divider(NULL, "pclk_div", "hclk", 0,
- clk_base + CLK_SYSTEM_RATE, 0, 2, 0, NULL);
+ clk_base + CLK_SYSTEM_RATE, 0, 2, 0,
+ &sysrate_lock);
clk = clk_register_gate(NULL, "pclk", "pclk_div", CLK_SET_RATE_PARENT,
clk_base + CLK_SYSTEM_RATE, 3,
- CLK_GATE_SET_TO_DISABLE, NULL);
+ CLK_GATE_SET_TO_DISABLE, &sysrate_lock);
clk_register_clkdev(clk, "pclk", NULL);
clks[pclk] = clk;
diff --git a/drivers/clk/tegra/clk-tegra30.c b/drivers/clk/tegra/clk-tegra30.c
index d169ef0..c5415ce 100644
--- a/drivers/clk/tegra/clk-tegra30.c
+++ b/drivers/clk/tegra/clk-tegra30.c
@@ -275,6 +275,7 @@ static DEFINE_SPINLOCK(clk_out_lock);
static DEFINE_SPINLOCK(pll_div_lock);
static DEFINE_SPINLOCK(cml_lock);
static DEFINE_SPINLOCK(pll_d_lock);
+static DEFINE_SPINLOCK(sysrate_lock);
#define TEGRA_INIT_DATA_MUX(_name, _con_id, _dev_id, _parents, _offset, \
_clk_num, _regs, _gate_flags, _clk_id) \
@@ -1348,19 +1349,21 @@ static void __init tegra30_super_clk_init(void)
/* HCLK */
clk = clk_register_divider(NULL, "hclk_div", "sclk", 0,
- clk_base + SYSTEM_CLK_RATE, 4, 2, 0, NULL);
+ clk_base + SYSTEM_CLK_RATE, 4, 2, 0,
+ &sysrate_lock);
clk = clk_register_gate(NULL, "hclk", "hclk_div", CLK_SET_RATE_PARENT,
clk_base + SYSTEM_CLK_RATE, 7,
- CLK_GATE_SET_TO_DISABLE, NULL);
+ CLK_GATE_SET_TO_DISABLE, &sysrate_lock);
clk_register_clkdev(clk, "hclk", NULL);
clks[hclk] = clk;
/* PCLK */
clk = clk_register_divider(NULL, "pclk_div", "hclk", 0,
- clk_base + SYSTEM_CLK_RATE, 0, 2, 0, NULL);
+ clk_base + SYSTEM_CLK_RATE, 0, 2, 0,
+ &sysrate_lock);
clk = clk_register_gate(NULL, "pclk", "pclk_div", CLK_SET_RATE_PARENT,
clk_base + SYSTEM_CLK_RATE, 3,
- CLK_GATE_SET_TO_DISABLE, NULL);
+ CLK_GATE_SET_TO_DISABLE, &sysrate_lock);
clk_register_clkdev(clk, "pclk", NULL);
clks[pclk] = clk;
--
1.7.7.rc0.72.g4b5ea.dirty
^ permalink raw reply related [flat|nested] 4+ messages in thread
* Re: [PATCH] clk: tegra: Add missing spinlock for hclk and pclk
2013-02-07 16:37 [PATCH] clk: tegra: Add missing spinlock for hclk and pclk Peter De Schrijver
@ 2013-02-07 17:49 ` Mike Turquette
2013-02-07 19:14 ` Stephen Warren
2013-02-08 5:23 ` Prashant Gaikwad
1 sibling, 1 reply; 4+ messages in thread
From: Mike Turquette @ 2013-02-07 17:49 UTC (permalink / raw)
To: Peter De Schrijver, pdeschrijver
Cc: Stephen Warren, Prashant Gaikwad, Joseph Lo, linux-kernel
Quoting Peter De Schrijver (2013-02-07 08:37:35)
> The hclk and pclk clocks are controlled by the same register. Hence a lock is
> required to avoid corruption.
>
> Signed-off-by: Peter De Schrijver <pdeschrijver@nvidia.com>
I assume this is going through the tegra tree with the other ccf
patches, so:
Acked-by: Mike Turquette <mturquette@linaro.org>
^ permalink raw reply [flat|nested] 4+ messages in thread
* Re: [PATCH] clk: tegra: Add missing spinlock for hclk and pclk
2013-02-07 17:49 ` Mike Turquette
@ 2013-02-07 19:14 ` Stephen Warren
0 siblings, 0 replies; 4+ messages in thread
From: Stephen Warren @ 2013-02-07 19:14 UTC (permalink / raw)
To: Mike Turquette
Cc: Peter De Schrijver, Stephen Warren, Prashant Gaikwad, Joseph Lo,
linux-kernel
On 02/07/2013 10:49 AM, Mike Turquette wrote:
> Quoting Peter De Schrijver (2013-02-07 08:37:35)
>> The hclk and pclk clocks are controlled by the same register. Hence a lock is
>> required to avoid corruption.
>>
>> Signed-off-by: Peter De Schrijver <pdeschrijver@nvidia.com>
>
> I assume this is going through the tegra tree with the other ccf
> patches, so:
>
> Acked-by: Mike Turquette <mturquette@linaro.org>
I've applied this to Tegra's for-3.9/soc-ccf-fixes branch.
^ permalink raw reply [flat|nested] 4+ messages in thread
* Re: [PATCH] clk: tegra: Add missing spinlock for hclk and pclk
2013-02-07 16:37 [PATCH] clk: tegra: Add missing spinlock for hclk and pclk Peter De Schrijver
2013-02-07 17:49 ` Mike Turquette
@ 2013-02-08 5:23 ` Prashant Gaikwad
1 sibling, 0 replies; 4+ messages in thread
From: Prashant Gaikwad @ 2013-02-08 5:23 UTC (permalink / raw)
To: Peter De Schrijver
Cc: Stephen Warren, Mike Turquette, Joseph Lo, linux-kernel
On Thursday 07 February 2013 10:07 PM, Peter De Schrijver wrote:
> The hclk and pclk clocks are controlled by the same register. Hence a lock is
> required to avoid corruption.
>
> Signed-off-by: Peter De Schrijver <pdeschrijver@nvidia.com>
Reviewed-by: Prashant Gaikwad <pgaikwad@nvidia.com>
> ---
> drivers/clk/tegra/clk-tegra20.c | 11 +++++++----
> drivers/clk/tegra/clk-tegra30.c | 11 +++++++----
> 2 files changed, 14 insertions(+), 8 deletions(-)
>
> diff --git a/drivers/clk/tegra/clk-tegra20.c b/drivers/clk/tegra/clk-tegra20.c
> index 5d41569..4612b2e 100644
> --- a/drivers/clk/tegra/clk-tegra20.c
> +++ b/drivers/clk/tegra/clk-tegra20.c
> @@ -194,6 +194,7 @@ static void __iomem *clk_base;
> static void __iomem *pmc_base;
>
> static DEFINE_SPINLOCK(pll_div_lock);
> +static DEFINE_SPINLOCK(sysrate_lock);
>
> #define TEGRA_INIT_DATA_MUX(_name, _con_id, _dev_id, _parents, _offset, \
> _clk_num, _regs, _gate_flags, _clk_id) \
> @@ -768,19 +769,21 @@ static void tegra20_super_clk_init(void)
>
> /* HCLK */
> clk = clk_register_divider(NULL, "hclk_div", "sclk", 0,
> - clk_base + CLK_SYSTEM_RATE, 4, 2, 0, NULL);
> + clk_base + CLK_SYSTEM_RATE, 4, 2, 0,
> + &sysrate_lock);
> clk = clk_register_gate(NULL, "hclk", "hclk_div", CLK_SET_RATE_PARENT,
> clk_base + CLK_SYSTEM_RATE, 7,
> - CLK_GATE_SET_TO_DISABLE, NULL);
> + CLK_GATE_SET_TO_DISABLE, &sysrate_lock);
> clk_register_clkdev(clk, "hclk", NULL);
> clks[hclk] = clk;
>
> /* PCLK */
> clk = clk_register_divider(NULL, "pclk_div", "hclk", 0,
> - clk_base + CLK_SYSTEM_RATE, 0, 2, 0, NULL);
> + clk_base + CLK_SYSTEM_RATE, 0, 2, 0,
> + &sysrate_lock);
> clk = clk_register_gate(NULL, "pclk", "pclk_div", CLK_SET_RATE_PARENT,
> clk_base + CLK_SYSTEM_RATE, 3,
> - CLK_GATE_SET_TO_DISABLE, NULL);
> + CLK_GATE_SET_TO_DISABLE, &sysrate_lock);
> clk_register_clkdev(clk, "pclk", NULL);
> clks[pclk] = clk;
>
> diff --git a/drivers/clk/tegra/clk-tegra30.c b/drivers/clk/tegra/clk-tegra30.c
> index d169ef0..c5415ce 100644
> --- a/drivers/clk/tegra/clk-tegra30.c
> +++ b/drivers/clk/tegra/clk-tegra30.c
> @@ -275,6 +275,7 @@ static DEFINE_SPINLOCK(clk_out_lock);
> static DEFINE_SPINLOCK(pll_div_lock);
> static DEFINE_SPINLOCK(cml_lock);
> static DEFINE_SPINLOCK(pll_d_lock);
> +static DEFINE_SPINLOCK(sysrate_lock);
>
> #define TEGRA_INIT_DATA_MUX(_name, _con_id, _dev_id, _parents, _offset, \
> _clk_num, _regs, _gate_flags, _clk_id) \
> @@ -1348,19 +1349,21 @@ static void __init tegra30_super_clk_init(void)
>
> /* HCLK */
> clk = clk_register_divider(NULL, "hclk_div", "sclk", 0,
> - clk_base + SYSTEM_CLK_RATE, 4, 2, 0, NULL);
> + clk_base + SYSTEM_CLK_RATE, 4, 2, 0,
> + &sysrate_lock);
> clk = clk_register_gate(NULL, "hclk", "hclk_div", CLK_SET_RATE_PARENT,
> clk_base + SYSTEM_CLK_RATE, 7,
> - CLK_GATE_SET_TO_DISABLE, NULL);
> + CLK_GATE_SET_TO_DISABLE, &sysrate_lock);
> clk_register_clkdev(clk, "hclk", NULL);
> clks[hclk] = clk;
>
> /* PCLK */
> clk = clk_register_divider(NULL, "pclk_div", "hclk", 0,
> - clk_base + SYSTEM_CLK_RATE, 0, 2, 0, NULL);
> + clk_base + SYSTEM_CLK_RATE, 0, 2, 0,
> + &sysrate_lock);
> clk = clk_register_gate(NULL, "pclk", "pclk_div", CLK_SET_RATE_PARENT,
> clk_base + SYSTEM_CLK_RATE, 3,
> - CLK_GATE_SET_TO_DISABLE, NULL);
> + CLK_GATE_SET_TO_DISABLE, &sysrate_lock);
> clk_register_clkdev(clk, "pclk", NULL);
> clks[pclk] = clk;
>
^ permalink raw reply [flat|nested] 4+ messages in thread
end of thread, other threads:[~2013-02-08 5:23 UTC | newest]
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2013-02-07 16:37 [PATCH] clk: tegra: Add missing spinlock for hclk and pclk Peter De Schrijver
2013-02-07 17:49 ` Mike Turquette
2013-02-07 19:14 ` Stephen Warren
2013-02-08 5:23 ` Prashant Gaikwad
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