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Commit fa32154e authored by Eric Millbrandt's avatar Eric Millbrandt Committed by Grant Likely
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powerpc/5200: tighten up ac97 reset timing 



Tighten up time timing around the gpio reset functionality.  Add a 200ns
delay before remuxing the pins back to ac97 to comply with the ac97 spec.

Signed-off-by: default avatarEric Millbrandt <emillbrandt@dekaresearch.com>
Signed-off-by: default avatarGrant Likely <grant.likely@secretlab.ca>
parent 915b9619

arch/powerpc/platforms/52xx/mpc52xx_common.c

+6 −2
Original line number Original line Diff line number Diff line
@@ -325,12 +325,16 @@ int mpc5200_psc_ac97_gpio_reset(int psc_number) 
	clrbits32(&simple_gpio->simple_dvo, sync | out);

	clrbits32(&simple_gpio->simple_dvo, sync | out);

	clrbits8(&wkup_gpio->wkup_dvo, reset);

	clrbits8(&wkup_gpio->wkup_dvo, reset);





	/* wait at lease 1 us */

	/* wait for 1 us */

	udelay(2);

	udelay(1);





	/* Deassert reset */

	/* Deassert reset */

	setbits8(&wkup_gpio->wkup_dvo, reset);

	setbits8(&wkup_gpio->wkup_dvo, reset);





	/* wait at least 200ns */

	/* 7 ~= (200ns * timebase) / ns2sec */

	__delay(7);



	/* Restore pin-muxing */

	/* Restore pin-muxing */

	out_be32(&simple_gpio->port_config, mux);

	out_be32(&simple_gpio->port_config, mux);