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staging: tidspbridge: use prepare/unprepare on dsp clocks 

This solves runtime failures while trying to enable WDT3 related
functionality on firmware load, however it does affect other clocks
controlled by the driver. Seen on 3.8-rc1.

CCF provides clk_prepare and clk_unprepare for enable and disable
operations respectively, this needs to be called in the correct
order while handling clocks.

Code path to enable/disable dsp clocks can still be reached from an
atomic context, hence we can't use clk_prepare_enable and
clk_disable_unprepare yet.

Signed-off-by: Omar Ramirez Luna <omar.ramirez@copitl.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Omar Ramirez Luna 2012-12-24 08:10:25 -06:00 committed by Greg Kroah-Hartman
parent fe02508529
commit e16a922a27
2 changed files with 22 additions and 3 deletions
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13
drivers/staging/tidspbridge/core/dsp-clock.c
View File

@ -121,9 +121,13 @@ void dsp_clk_exit(void)
for (i = 0; i < DM_TIMER_CLOCKS; i++)
omap_dm_timer_free(timer[i]);
clk_unprepare(iva2_clk);
clk_put(iva2_clk);
clk_unprepare(ssi.sst_fck);
clk_put(ssi.sst_fck);
clk_unprepare(ssi.ssr_fck);
clk_put(ssi.ssr_fck);
clk_unprepare(ssi.ick);
clk_put(ssi.ick);
}
@ -145,14 +149,21 @@ void dsp_clk_init(void)
iva2_clk = clk_get(&dspbridge_device.dev, "iva2_ck");
if (IS_ERR(iva2_clk))
dev_err(bridge, "failed to get iva2 clock %p\n", iva2_clk);
else
clk_prepare(iva2_clk);
ssi.sst_fck = clk_get(&dspbridge_device.dev, "ssi_sst_fck");
ssi.ssr_fck = clk_get(&dspbridge_device.dev, "ssi_ssr_fck");
ssi.ick = clk_get(&dspbridge_device.dev, "ssi_ick");
if (IS_ERR(ssi.sst_fck) || IS_ERR(ssi.ssr_fck) || IS_ERR(ssi.ick))
if (IS_ERR(ssi.sst_fck) || IS_ERR(ssi.ssr_fck) || IS_ERR(ssi.ick)) {
dev_err(bridge, "failed to get ssi: sst %p, ssr %p, ick %p\n",
ssi.sst_fck, ssi.ssr_fck, ssi.ick);
} else {
clk_prepare(ssi.sst_fck);
clk_prepare(ssi.ssr_fck);
clk_prepare(ssi.ick);
}
}
/**

12
drivers/staging/tidspbridge/core/wdt.c
View File

@ -63,11 +63,15 @@ int dsp_wdt_init(void)
dsp_wdt.fclk = clk_get(NULL, "wdt3_fck");
if (!IS_ERR(dsp_wdt.fclk)) {
clk_prepare(dsp_wdt.fclk);
dsp_wdt.iclk = clk_get(NULL, "wdt3_ick");
if (IS_ERR(dsp_wdt.iclk)) {
clk_put(dsp_wdt.fclk);
dsp_wdt.fclk = NULL;
ret = -EFAULT;
} else {
clk_prepare(dsp_wdt.iclk);
}
} else
ret = -EFAULT;
@ -95,10 +99,14 @@ void dsp_wdt_exit(void)
free_irq(INT_34XX_WDT3_IRQ, &dsp_wdt);
tasklet_kill(&dsp_wdt.wdt3_tasklet);
if (dsp_wdt.fclk)
if (dsp_wdt.fclk) {
clk_unprepare(dsp_wdt.fclk);
clk_put(dsp_wdt.fclk);
if (dsp_wdt.iclk)
}
if (dsp_wdt.iclk) {
clk_unprepare(dsp_wdt.iclk);
clk_put(dsp_wdt.iclk);
}
dsp_wdt.fclk = NULL;
dsp_wdt.iclk = NULL;