Re: [PATCH 01/11] ARM: omap: clk: add clk_prepare and clk_unprepare
On Friday 22 June 2012 11:12 PM, Pankaj Jangra wrote:
diff --git a/arch/arm/mach-omap2/display.c b/arch/arm/mach-omap2/display.c
> index 5fb47a1..e5f8e48 100644
> --- a/arch/arm/mach-omap2/display.c
> +++ b/arch/arm/mach-omap2/display.c
> @@ -471,7 +471,7 @@ int omap_dss_reset(struct omap_hwmod *oh)
>
> for (i = oh->opt_clks_cnt, oc = oh->opt_clks; i> 0; i--, oc++)
> if (oc->_clk)
> - clk_enable(oc->_clk);
> + clk_prepare_enable(oc->_clk);
>
> dispc_disable_outputs();
>
> @@ -498,7 +498,7 @@ int omap_dss_reset(struct omap_hwmod *oh)
>
> for (i = oh->opt_clks_cnt, oc = oh->opt_clks; i> 0; i--, oc++)
> if (oc->_clk)
> - clk_disable(oc->_clk);
> + clk_disable_unprepare(oc->_clk);
>
Just a doubt. Isn't it the same clocks you are preparing in omap_hwmod.c ?
Yes, but different users can and should prepare and enable clocks
independently, and hence the framework does usecounting to keep track.
> r = (c == MAX_MODULE_SOFTRESET_WAIT) ? -ETIMEDOUT : 0;
>
d> diff --git a/arch/arm/mach-omap2/omap_hwmod.c
b/arch/arm/mach-omap2/omap_hwmod.c
> index bf86f7e..2746bce 100644
> --- a/arch/arm/mach-omap2/omap_hwmod.c
> +++ b/arch/arm/mach-omap2/omap_hwmod.c
> @@ -608,6 +608,7 @@ static int _init_main_clk(struct omap_hwmod *oh)
> oh->name, oh->main_clk);
> return -EINVAL;
> }
> + clk_prepare(oh->_clk);
>
> if (!oh->_clk->clkdm)
> pr_warning("omap_hwmod: %s: missing clockdomain for %s.\n",
> @@ -644,6 +645,7 @@ static int _init_interface_clks(struct omap_hwmod *oh)
> oh->name, os->clk);
> ret = -EINVAL;
> }
> + clk_prepare(os->_clk);
> os->_clk = c;
You should do clk_prepare() after os->_clk = c statement. Otherwise
you are operating on a uninitialized structure pointer.
yes, that was really stupid of me :(. Thanks for catching this.
> }
>
> @@ -671,6 +673,7 @@ static int _init_opt_clks(struct omap_hwmod *oh)
> oh->name, oc->clk);
> ret = -EINVAL;
> }
> + clk_prepare(oc->_clk);
Same here. You are preparing the uninitialized clk structure.
Thanks, will fix.
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Re: [PATCH 01/11] ARM: omap: clk: add clk_prepare and clk_unprepare
Hi,
On Fri, Jun 22, 2012 at 7:18 PM, Rajendra Nayak wrote:
> As part of Common Clk Framework (CCF) the clk_enable() operation
> was split into a clk_prepare() which could sleep, and a clk_enable()
> which should never sleep. Similarly the clk_disable() was
> split into clk_disable() and clk_unprepare(). This was
> needed to handle complex cases where in a clk gate/ungate
> would require a slow and a fast part to be implemented.
> None of the clocks below seem to be in the 'complex' clocks
> category and are just simple clocks which are enabled/disabled
> through simple register writes.
> Most of the instances also seem to be called in non-atomic
> context which means its safe to move all of those from
> using a clk_enable() to clk_prepare_enable() and clk_disable() to
> clk_disable_unprepare().
> For a few others where there is a possibility they get called from
> an interrupt or atomic context, there is an additonal clk_prepare()
> done immediately following a clk_get() and a clk_unprepare()
> immediately preceding the clk_put().
> This is in preparation of OMAP moving to CCF.
>
> Based on initial changes from Mike turquette.
>
> Signed-off-by: Rajendra Nayak
> ---
> arch/arm/mach-omap2/board-apollon.c | 4 ++--
> arch/arm/mach-omap2/board-h4.c | 6 +++---
> arch/arm/mach-omap2/board-omap4panda.c | 2 +-
> arch/arm/mach-omap2/clock3xxx.c | 8
> arch/arm/mach-omap2/display.c | 4 ++--
> arch/arm/mach-omap2/gpmc.c | 2 +-
> arch/arm/mach-omap2/omap_hwmod.c | 3 +++
> arch/arm/mach-omap2/omap_phy_internal.c | 3 +++
> arch/arm/mach-omap2/pm24xx.c | 2 ++
> arch/arm/mach-omap2/usb-fs.c | 4 ++--
> 10 files changed, 23 insertions(+), 15 deletions(-)
>
> }
>
> diff --git a/arch/arm/mach-omap2/display.c b/arch/arm/mach-omap2/display.c
> index 5fb47a1..e5f8e48 100644
> --- a/arch/arm/mach-omap2/display.c
> +++ b/arch/arm/mach-omap2/display.c
> @@ -471,7 +471,7 @@ int omap_dss_reset(struct omap_hwmod *oh)
>
> for (i = oh->opt_clks_cnt, oc = oh->opt_clks; i > 0; i--, oc++)
> if (oc->_clk)
> - clk_enable(oc->_clk);
> + clk_prepare_enable(oc->_clk);
>
> dispc_disable_outputs();
>
> @@ -498,7 +498,7 @@ int omap_dss_reset(struct omap_hwmod *oh)
>
> for (i = oh->opt_clks_cnt, oc = oh->opt_clks; i > 0; i--, oc++)
> if (oc->_clk)
> - clk_disable(oc->_clk);
> + clk_disable_unprepare(oc->_clk);
>
Just a doubt. Isn't it the same clocks you are preparing in omap_hwmod.c ?
> r = (c == MAX_MODULE_SOFTRESET_WAIT) ? -ETIMEDOUT : 0;
>
d> diff --git a/arch/arm/mach-omap2/omap_hwmod.c
b/arch/arm/mach-omap2/omap_hwmod.c
> index bf86f7e..2746bce 100644
> --- a/arch/arm/mach-omap2/omap_hwmod.c
> +++ b/arch/arm/mach-omap2/omap_hwmod.c
> @@ -608,6 +608,7 @@ static int _init_main_clk(struct omap_hwmod *oh)
> oh->name, oh->main_clk);
> return -EINVAL;
> }
> + clk_prepare(oh->_clk);
>
> if (!oh->_clk->clkdm)
> pr_warning("omap_hwmod: %s: missing clockdomain for %s.\n",
> @@ -644,6 +645,7 @@ static int _init_interface_clks(struct omap_hwmod *oh)
> oh->name, os->clk);
> ret = -EINVAL;
> }
> + clk_prepare(os->_clk);
> os->_clk = c;
You should do clk_prepare() after os->_clk = c statement. Otherwise
you are operating on a uninitialized structure pointer.
> }
>
> @@ -671,6 +673,7 @@ static int _init_opt_clks(struct omap_hwmod *oh)
> oh->name, oc->clk);
> ret = -EINVAL;
> }
> + clk_prepare(oc->_clk);
Same here. You are preparing the uninitialized clk structure.
> oc->_clk = c;
> }
>
d
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[PATCH 01/11] ARM: omap: clk: add clk_prepare and clk_unprepare
As part of Common Clk Framework (CCF) the clk_enable() operation was split into a clk_prepare() which could sleep, and a clk_enable() which should never sleep. Similarly the clk_disable() was split into clk_disable() and clk_unprepare(). This was needed to handle complex cases where in a clk gate/ungate would require a slow and a fast part to be implemented. None of the clocks below seem to be in the 'complex' clocks category and are just simple clocks which are enabled/disabled through simple register writes. Most of the instances also seem to be called in non-atomic context which means its safe to move all of those from using a clk_enable() to clk_prepare_enable() and clk_disable() to clk_disable_unprepare(). For a few others where there is a possibility they get called from an interrupt or atomic context, there is an additonal clk_prepare() done immediately following a clk_get() and a clk_unprepare() immediately preceding the clk_put(). This is in preparation of OMAP moving to CCF. Based on initial changes from Mike turquette. Signed-off-by: Rajendra Nayak --- arch/arm/mach-omap2/board-apollon.c |4 ++-- arch/arm/mach-omap2/board-h4.c |6 +++--- arch/arm/mach-omap2/board-omap4panda.c |2 +- arch/arm/mach-omap2/clock3xxx.c |8 arch/arm/mach-omap2/display.c |4 ++-- arch/arm/mach-omap2/gpmc.c |2 +- arch/arm/mach-omap2/omap_hwmod.c|3 +++ arch/arm/mach-omap2/omap_phy_internal.c |3 +++ arch/arm/mach-omap2/pm24xx.c|2 ++ arch/arm/mach-omap2/usb-fs.c|4 ++-- 10 files changed, 23 insertions(+), 15 deletions(-) diff --git a/arch/arm/mach-omap2/board-apollon.c b/arch/arm/mach-omap2/board-apollon.c index 502c31e..1d8c693 100644 --- a/arch/arm/mach-omap2/board-apollon.c +++ b/arch/arm/mach-omap2/board-apollon.c @@ -205,7 +205,7 @@ static inline void __init apollon_init_smc91x(void) return; } - clk_enable(gpmc_fck); + clk_prepare_enable(gpmc_fck); rate = clk_get_rate(gpmc_fck); eth_cs = APOLLON_ETH_CS; @@ -249,7 +249,7 @@ static inline void __init apollon_init_smc91x(void) gpmc_cs_free(APOLLON_ETH_CS); } out: - clk_disable(gpmc_fck); + clk_disable_unprepare(gpmc_fck); clk_put(gpmc_fck); } diff --git a/arch/arm/mach-omap2/board-h4.c b/arch/arm/mach-omap2/board-h4.c index 876becf..a273af0 100644 --- a/arch/arm/mach-omap2/board-h4.c +++ b/arch/arm/mach-omap2/board-h4.c @@ -267,9 +267,9 @@ static inline void __init h4_init_debug(void) return; } - clk_enable(gpmc_fck); + clk_prepare_enable(gpmc_fck); rate = clk_get_rate(gpmc_fck); - clk_disable(gpmc_fck); + clk_disable_unprepare(gpmc_fck); clk_put(gpmc_fck); if (is_gpmc_muxed()) @@ -313,7 +313,7 @@ static inline void __init h4_init_debug(void) gpmc_cs_free(eth_cs); out: - clk_disable(gpmc_fck); + clk_disable_unprepare(gpmc_fck); clk_put(gpmc_fck); } diff --git a/arch/arm/mach-omap2/board-omap4panda.c b/arch/arm/mach-omap2/board-omap4panda.c index 982fb26..f0ea558 100644 --- a/arch/arm/mach-omap2/board-omap4panda.c +++ b/arch/arm/mach-omap2/board-omap4panda.c @@ -172,7 +172,7 @@ static void __init omap4_ehci_init(void) return; } clk_set_rate(phy_ref_clk, 1920); - clk_enable(phy_ref_clk); + clk_prepare_enable(phy_ref_clk); /* disable the power to the usb hub prior to init and reset phy+hub */ ret = gpio_request_array(panda_ehci_gpios, diff --git a/arch/arm/mach-omap2/clock3xxx.c b/arch/arm/mach-omap2/clock3xxx.c index 794d827..4c1591a 100644 --- a/arch/arm/mach-omap2/clock3xxx.c +++ b/arch/arm/mach-omap2/clock3xxx.c @@ -64,15 +64,15 @@ void __init omap3_clk_lock_dpll5(void) dpll5_clk = clk_get(NULL, "dpll5_ck"); clk_set_rate(dpll5_clk, DPLL5_FREQ_FOR_USBHOST); - clk_enable(dpll5_clk); + clk_prepare_enable(dpll5_clk); /* Program dpll5_m2_clk divider for no division */ dpll5_m2_clk = clk_get(NULL, "dpll5_m2_ck"); - clk_enable(dpll5_m2_clk); + clk_prepare_enable(dpll5_m2_clk); clk_set_rate(dpll5_m2_clk, DPLL5_FREQ_FOR_USBHOST); - clk_disable(dpll5_m2_clk); - clk_disable(dpll5_clk); + clk_disable_unprepare(dpll5_m2_clk); + clk_disable_unprepare(dpll5_clk); return; } diff --git a/arch/arm/mach-omap2/display.c b/arch/arm/mach-omap2/display.c index 5fb47a1..e5f8e48 100644 --- a/arch/arm/mach-omap2/display.c +++ b/arch/arm/mach-omap2/display.c @@ -471,7 +471,7 @@ int omap_dss_reset(struct omap_hwmod *oh) for (i = oh->opt_clks_cnt, oc = oh->opt_clks; i > 0; i--, oc++) if (oc->_clk) - clk_enable(oc->_clk); + clk_prepare_enable(oc->_clk); dispc_disable_outputs(); @@ -498,7 +498,7 @@ i
