linux-kernel - Re: [PATCH v4 17/33] crypto: rockchip: use read_poll

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Date:   Mon, 11 Apr 2022 10:33:22 +0200
From:   LABBE Corentin <clabbe@...libre.com>
To:     John Keeping <john@...anate.com>
Cc:     heiko@...ech.de, herbert@...dor.apana.org.au, krzk+dt@...nel.org,
        robh+dt@...nel.org, devicetree@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org, linux-crypto@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-rockchip@...ts.infradead.org
Subject: Re: [PATCH v4 17/33] crypto: rockchip: use read_poll_timeout

Le Mon, Apr 04, 2022 at 12:38:27PM +0100, John Keeping a écrit :
> On Fri, Apr 01, 2022 at 08:17:48PM +0000, Corentin Labbe wrote:
> > Use read_poll_timeout instead of open coding it
> > 
> > Signed-off-by: Corentin Labbe <clabbe@...libre.com>
> > ---
> >  drivers/crypto/rockchip/rk3288_crypto_ahash.c | 5 +++--
> >  1 file changed, 3 insertions(+), 2 deletions(-)
> > 
> > diff --git a/drivers/crypto/rockchip/rk3288_crypto_ahash.c b/drivers/crypto/rockchip/rk3288_crypto_ahash.c
> > index 137013bd4410..21c9a0327ddf 100644
> > --- a/drivers/crypto/rockchip/rk3288_crypto_ahash.c
> > +++ b/drivers/crypto/rockchip/rk3288_crypto_ahash.c
> > @@ -10,6 +10,7 @@
> >   */
> >  #include <linux/device.h>
> >  #include <asm/unaligned.h>
> > +#include <linux/iopoll.h>
> >  #include "rk3288_crypto.h"
> >  
> >  /*
> > @@ -305,8 +306,8 @@ static int rk_hash_run(struct crypto_engine *engine, void *breq)
> >  		 * efficiency, and make it response quickly when dma
> >  		 * complete.
> >  		 */
> > -	while (!CRYPTO_READ(tctx->dev, RK_CRYPTO_HASH_STS))
> > -		udelay(10);
> > +	read_poll_timeout(readl, v, v == 0, 10, 1000, false,
> > +			  tctx->dev->dev + RK_CRYPTO_HASH_STS);
> 
> This can be simplified to:
> 
> 	readl_poll_timeout(tctx->dev->dev + RK_CRYPTO_HASH_STS,
> 			   v, v == 0, 10, 1000);

Thanks, this is better.

> 
> But shouldn't this be tctx->dev->reg ?!

Yes, I will fix it.

Thanks
Regards