From mboxrd@z Thu Jan 1 00:00:00 1970 From: David Daney Subject: Re: [PATCH 1/2] libata: Add three more columns to the ata_timing table. Date: Tue, 25 Nov 2008 08:46:06 -0800 Message-ID: <492C2BCE.60409@caviumnetworks.com> References: <492B56B0.9030409@caviumnetworks.com> <1227577181-30206-1-git-send-email-ddaney@caviumnetworks.com> <492BDB28.8020103@ru.mvista.com> Mime-Version: 1.0 Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit Return-path: Received: from mail3.caviumnetworks.com ([12.108.191.235]:65434 "EHLO mail3.caviumnetworks.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751668AbYKYQqo (ORCPT ); Tue, 25 Nov 2008 11:46:44 -0500 In-Reply-To: <492BDB28.8020103@ru.mvista.com> Sender: linux-ide-owner@vger.kernel.org List-Id: linux-ide@vger.kernel.org To: Sergei Shtylyov Cc: linux-ide@vger.kernel.org, linux-mips@linux-mips.org Sergei Shtylyov wrote: > Hello. > > David Daney wrote: > >> The forthcoming OCTEON SOC Compact Flash driver needs a few more >> timing values than were available in the ata_timing table. I add new >> columns for write_hold, read_hold, and read_holdz times. The values >> were obtained from the Compact Flash specification Rev 4.1. >> >> Signed-off-by: David Daney >> > > Not quite correct... > >> diff --git a/drivers/ata/libata-core.c b/drivers/ata/libata-core.c >> index 4214bfb..b29b7df 100644 >> --- a/drivers/ata/libata-core.c >> +++ b/drivers/ata/libata-core.c >> @@ -2946,33 +2946,33 @@ int sata_set_spd(struct ata_link *link) >> */ >> >> static const struct ata_timing ata_timing[] = { >> > [...] >> +/* { XFER_PIO_SLOW, 120, 290, 240, 960, 290, 240, 30, 5, 30, >> 960, 0 }, */ >> + { XFER_PIO_0, 70, 290, 240, 600, 165, 150, 30, 5, 30, 600, >> 0 }, >> + { XFER_PIO_1, 50, 290, 93, 383, 125, 100, 20, 5, 30, 383, >> 0 }, >> + { XFER_PIO_2, 30, 290, 40, 330, 100, 90, 15, 5, 30, 240, >> 0 }, >> + { XFER_PIO_3, 30, 80, 70, 180, 80, 70, 10, 5, 30, 180, >> 0 }, >> + { XFER_PIO_4, 25, 70, 25, 120, 70, 25, 10, 5, 30, 120, >> 0 }, >> + { XFER_PIO_5, 15, 65, 25, 100, 65, 25, 5, 5, 20, 100, >> 0 }, >> + { XFER_PIO_6, 10, 55, 20, 80, 55, 20, 5, 5, 20, 80, >> 0 }, >> + >> + { XFER_SW_DMA_0, 120, 0, 0, 0, 480, 480, 30, 5, 0, 960, >> 0 }, >> + { XFER_SW_DMA_1, 90, 0, 0, 0, 240, 240, 30, 5, 0, 480, >> 0 }, >> + { XFER_SW_DMA_2, 60, 0, 0, 0, 120, 120, 15, 5, 0, 240, >> 0 }, >> + >> + { XFER_MW_DMA_0, 60, 0, 0, 0, 215, 215, 20, 20, 0, 480, >> 0 }, >> > > Wrong, -DIOR hold time is 5 ns for MWDMA0 as well as for all other modes. Point taken. > >> diff --git a/include/linux/libata.h b/include/linux/libata.h >> index 59b0f1c..7c44e45 100644 >> --- a/include/linux/libata.h >> +++ b/include/linux/libata.h >> > [...] >> @@ -863,6 +868,9 @@ struct ata_timing { >> unsigned short cyc8b; /* t0 for 8-bit I/O */ >> unsigned short active; /* t2 or tD */ >> unsigned short recover; /* t2i or tK */ >> + unsigned short write_hold; /* t4 */ >> + unsigned short read_hold; /* t6 */ >> > > -DIOR hold time is 5 ns for all PIO and MWDMA modes -- there's no > sense in storing it here. > By storing it here, ata_timing_compute() will compute the bus clock counts for me. Makes perfect sense to me. >> + unsigned short read_holdz; /* t6z or tj */ >> > > T6z and Tj are not the same timing. Well, you specify it as 0 for DMA > modes anyway... > I had intended to overload this column for DMA, but somehow screwed it up. For my next patch I plan to populate this column for DMA modes. David Daney