linux-kernel - Re: [PATCH 2/2] nouveau: replace large udelay by mdelay

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Date:	Mon, 27 May 2013 11:10:16 +0200
From:	Marc Dietrich <marvin24@....de>
To:	Ben Skeggs <bskeggs@...hat.com>
Cc:	David Airlie <airlied@...ux.ie>, linux-kernel@...r.kernel.org,
	arnd@...db.de
Subject: Re: [PATCH 2/2] nouveau: replace large udelay by mdelay

Hi Ben,

can you pick up Arnd's fix from

https://patchwork.kernel.org/patch/2489141/

for your stable (3.10) branch?

Marc

Am Mittwoch, 22. Mai 2013, 21:48:42 schrieb Marc Dietrich:
> ARM has a maximum of 2000 usec delay. Use mdelay for larger delays.
> This affects distro kernels mostly.
> 
> Cc: David Airlie <airlied@...ux.ie>
> Cc: Ben Skeggs <bskeggs@...hat.com>
> Signed-off-by: Marc Dietrich <marvin24@....de>
> ---
>  drivers/gpu/drm/nouveau/core/engine/disp/dacnv50.c |    3 ++-
>  1 file changed, 2 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/gpu/drm/nouveau/core/engine/disp/dacnv50.c
> b/drivers/gpu/drm/nouveau/core/engine/disp/dacnv50.c index d0817d9..ed7415e
> 100644
> --- a/drivers/gpu/drm/nouveau/core/engine/disp/dacnv50.c
> +++ b/drivers/gpu/drm/nouveau/core/engine/disp/dacnv50.c
> @@ -51,7 +51,8 @@ nv50_dac_sense(struct nv50_disp_priv *priv, int or, u32
> loadval) const u32 doff = (or * 0x800);
>  	int load = -EINVAL;
>  	nv_wr32(priv, 0x61a00c + doff, 0x00100000 | loadval);
> -	udelay(9500);
> +	mdelay(9);
> +	udelay(500);
>  	nv_wr32(priv, 0x61a00c + doff, 0x80000000);
>  	load = (nv_rd32(priv, 0x61a00c + doff) & 0x38000000) >> 27;
>  	nv_wr32(priv, 0x61a00c + doff, 0x00000000);
--
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