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bus: ti-sysc: Ignore clockactivity unless specified as a quirk 

We must ignore the clockactivity bit for most modules and not set it
unless specified for the module with SYSC_QUIRK_USE_CLOCKACT. Otherwise
the interface clock can be automatically gated constantly causing
unexpected performance issues.

Fixes: ae9ae12e9d ("bus: ti-sysc: Handle clockactivity for enable and disable")
Cc: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Cc: Tomi Valkeinen <tomi.valkeinen@ti.com>
Signed-off-by: Tony Lindgren <tony@atomide.com>
This commit is contained in:
Tony Lindgren 2020-05-31 12:37:54 -07:00
parent d46f9fbec7
commit 08b91dd6e5
1 changed files with 6 additions and 3 deletions
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9
drivers/bus/ti-sysc.c
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@ -988,10 +988,13 @@ static int sysc_enable_module(struct device *dev)
regbits = ddata->cap->regbits;
reg = sysc_read(ddata, ddata->offsets[SYSC_SYSCONFIG]);
/* Set CLOCKACTIVITY, we only use it for ick */
/*
* Set CLOCKACTIVITY, we only use it for ick. And we only configure it
* based on the SYSC_QUIRK_USE_CLOCKACT flag, not based on the hardware
* capabilities. See the old HWMOD_SET_DEFAULT_CLOCKACT flag.
*/
if (regbits->clkact_shift >= 0 &&
(ddata->cfg.quirks & SYSC_QUIRK_USE_CLOCKACT ||
ddata->cfg.sysc_val & BIT(regbits->clkact_shift)))
(ddata->cfg.quirks & SYSC_QUIRK_USE_CLOCKACT))
reg |= SYSC_CLOCACT_ICK << regbits->clkact_shift;
/* Set SIDLE mode */