From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 0D8CFE9371C for ; Thu, 5 Oct 2023 20:46:44 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S230317AbjJEUqn (ORCPT ); Thu, 5 Oct 2023 16:46:43 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:34494 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229526AbjJEUqm (ORCPT ); Thu, 5 Oct 2023 16:46:42 -0400 Received: from hosting.gsystem.sk (hosting.gsystem.sk [212.5.213.30]) by lindbergh.monkeyblade.net (Postfix) with ESMTP id 2ACFD95; Thu, 5 Oct 2023 13:46:41 -0700 (PDT) Received: from [192.168.0.2] (chello085216244195.chello.sk [85.216.244.195]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature RSA-PSS (2048 bits) server-digest SHA256) (No client certificate requested) by hosting.gsystem.sk (Postfix) with ESMTPSA id 3DC607A001E; Thu, 5 Oct 2023 22:46:40 +0200 (CEST) From: Ondrej Zary To: Sergey Shtylyov Subject: Re: [PATCH 4/4] ata: pata_parport: fit3: implement IDE command set registers Date: Thu, 5 Oct 2023 22:46:37 +0200 User-Agent: KMail/1.9.10 Cc: Damien Le Moal , Sudip Mukherjee , Christoph Hellwig , Tim Waugh , linux-parport@lists.infradead.org, linux-ide@vger.kernel.org, linux-kernel@vger.kernel.org References: <20231005192440.4047-1-linux@zary.sk> <20231005192440.4047-5-linux@zary.sk> In-Reply-To: X-KMail-QuotePrefix: > MIME-Version: 1.0 Content-Type: Text/Plain; charset="utf-8" Content-Transfer-Encoding: 7bit Content-Disposition: inline Message-Id: <202310052246.37625.linux@zary.sk> Precedence: bulk List-ID: X-Mailing-List: linux-ide@vger.kernel.org On Thursday 05 October 2023 21:53:44 Sergey Shtylyov wrote: > On 10/5/23 10:24 PM, Ondrej Zary wrote: > > > fit3 protocol driver does not support accessing IDE control registers > > (device control/altstatus). The DOS driver does not use these registers > > either (as observed from DOSEMU trace). But the HW seems to be capable > > of accessing these registers - I simply tried bit 3 and it works! > > > > The control register is required to properly reset ATAPI devices or > > they will be detected only once (after a power cycle). > > > > Tested with EXP Computer CD-865 with MC-1285B EPP cable and > > TransDisk 3000. > > > > Signed-off-by: Ondrej Zary > > Reviewed-by: Sergey Shtylyov > > > --- > > drivers/ata/pata_parport/fit3.c | 14 ++------------ > > 1 file changed, 2 insertions(+), 12 deletions(-) > > > > diff --git a/drivers/ata/pata_parport/fit3.c b/drivers/ata/pata_parport/fit3.c > > index bad7aa920cdc..d2b81cf2e16d 100644 > > --- a/drivers/ata/pata_parport/fit3.c > > +++ b/drivers/ata/pata_parport/fit3.c > [...] > > @@ -59,11 +53,7 @@ static int fit3_read_regr(struct pi_adapter *pi, int cont, int regr) > > { > > int a, b; > > > > - if (cont) { > > - if (regr != 6) > > - return 0xff; > > - regr = 7; > > - } > > + regr += cont << 3; > > So, is regr == 7 instead of 8 intentional? The original code read ATA_REG_STATUS (7) in context 0 instead of ALT_STATUS (6) in context 1. -- Ondrej Zary