From mboxrd@z Thu Jan 1 00:00:00 1970 From: Stanislaw Gruszka Subject: Re: [PATCH v3] ata: pata_at91.c bugfix for high master clock Date: Mon, 28 Mar 2011 21:29:55 +0200 Message-ID: <20110328192955.GA2291@localhost.localdomain> References: <1301313595-23156-1-git-send-email-plyatov@gmail.com> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Return-path: Received: from mx3.wp.pl ([212.77.101.7]:12105 "EHLO mx3.wp.pl" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1754816Ab1C1TaH (ORCPT ); Mon, 28 Mar 2011 15:30:07 -0400 Content-Disposition: inline In-Reply-To: <1301313595-23156-1-git-send-email-plyatov@gmail.com> Sender: linux-ide-owner@vger.kernel.org List-Id: linux-ide@vger.kernel.org To: Igor Plyatov Cc: Jeff Garzik , linux-ide@vger.kernel.org, linux-kernel@vger.kernel.org On Mon, Mar 28, 2011 at 03:59:55PM +0400, Igor Plyatov wrote: > The AT91SAM9 microcontrollers with master clock higher then 105 MHz > and PIO0, have overflow of the NCS_RD_PULSE value in the MSB. This > lead to "NCS_RD_PULSE" pulse longer then "NRD_CYCLE" pulse and driver > does not detect ATA device. > > Signed-off-by: Igor Plyatov > --- > drivers/ata/pata_at91.c | 8 +++++++- > 1 files changed, 7 insertions(+), 1 deletions(-) > > diff --git a/drivers/ata/pata_at91.c b/drivers/ata/pata_at91.c > index d1aaeb5..3c2bf86 100644 > --- a/drivers/ata/pata_at91.c > +++ b/drivers/ata/pata_at91.c > @@ -33,11 +33,12 @@ > > > #define DRV_NAME "pata_at91" > -#define DRV_VERSION "0.1" > +#define DRV_VERSION "0.2" > > #define CF_IDE_OFFSET 0x00c00000 > #define CF_ALT_IDE_OFFSET 0x00e00000 > #define CF_IDE_RES_SIZE 0x08 > +#define NCS_RD_PULSE_LIMIT 0x3f /* maximal value for pulse bitfields */ > > struct at91_ide_info { > unsigned long mode; > @@ -110,6 +111,11 @@ static void set_smc_timing(struct device *dev, > /* (CS0, CS1, DIR, OE) <= (CFCE1, CFCE2, CFRNW, NCSX) timings */ > ncs_read_setup = 1; > ncs_read_pulse = read_cycle - 2; > + if (ncs_read_pulse > NCS_RD_PULSE_LIMIT) { > + ncs_read_pulse = NCS_RD_PULSE_LIMIT; It's ATA specification break, I explained this already here: http://marc.info/?l=linux-ide&m=129254321006232&w=2 Do we want fix that do not conform specification? Stanislaw