Messages in this thread | | | Subject | Re: [PATCH 2/2] arm: omap_hwmod disable ick autoidling when a hwmod requires that | From | Tero Kristo <> | Date | Thu, 8 Nov 2018 14:35:14 +0200 |
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On 08/11/2018 13:08, Andreas Kemnade wrote: > Hi, > > On Thu, 8 Nov 2018 12:26:08 +0200 > Tero Kristo <t-kristo@ti.com> wrote: > >> On 04/10/2018 23:38, Andreas Kemnade wrote: >>> Deny autoidle for hwmods with the OCPIF_SWSUP_IDLE flag, >>> that makes hwmods working properly which cannot handle >>> autoidle properly in lower power states. >>> Affected is e. g. the omap_hdq. >>> Since an ick might have mulitple users, autoidle is disabled >>> when an individual user requires that rather than in >>> _setup_iclk_autoidle. dss_ick is an example for that. >>> >>> Signed-off-by: Andreas Kemnade <andreas@kemnade.info> >>> --- >>> arch/arm/mach-omap2/omap_hwmod.c | 16 ++++++++++++---- >>> 1 file changed, 12 insertions(+), 4 deletions(-) >>> >>> diff --git a/arch/arm/mach-omap2/omap_hwmod.c b/arch/arm/mach-omap2/omap_hwmod.c >>> index bb641e6c93d0..0078b0e1d242 100644 >>> --- a/arch/arm/mach-omap2/omap_hwmod.c >>> +++ b/arch/arm/mach-omap2/omap_hwmod.c >>> @@ -986,8 +986,10 @@ static int _enable_clocks(struct omap_hwmod *oh) >>> clk_enable(oh->_clk); >>> >>> list_for_each_entry(os, &oh->slave_ports, node) { >>> - if (os->_clk && (os->flags & OCPIF_SWSUP_IDLE)) >>> + if (os->_clk && (os->flags & OCPIF_SWSUP_IDLE)) { >>> + omap2_clk_deny_idle(os->_clk); >> >> I think calling this unconditionally across all platforms / clock types >> might cause problems. Checking kernel, am33xx seems to have one clock >> with this flag that is not of omap2 type. Do we have any testing data >> that this doesn't break things? >> > Somehow I have missed that am33xx clock. I have not tested it on that > platform. Concerning am3xxx I have only a beaglebone block but it not > am33xx I guess. So I have to recheck I guess.
Beaglebone black is am33xx based device, so you can use that for testing.
> But I think the intention of this flag was to control autoidle > vs. sw-controlled idle according to... > [...] >>> if (os->flags & OCPIF_SWSUP_IDLE) { >>> - /* XXX omap_iclk_deny_idle(c); */ >>> + /* > this comment. So we need a if (clock_is_omap2()) or something like that > or remove that flag from any other clocks?
You could add check within the omap2_clk_deny_idle / allow_idle calls themselves. You can check for presence of flag CLK_IS_BASIC, this is not set for omap clocks.
-Tero
> > Regards, > Andreas >
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