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Re: [PATCH 1/2] libata: Add two more columns to the ata_timing table.

To: David Daney <>
Subject: Re: [PATCH 1/2] libata: Add two more columns to the ata_timing table.
From: Sergei Shtylyov <>
Date: Sat, 06 Dec 2008 23:19:20 +0300
In-reply-to: <>
Organization: MontaVista Software Inc.
Original-recipient: rfc822;
References: <> <>
User-agent: Mozilla/5.0 (X11; U; Linux i686; rv:1.7.2) Gecko/20040803

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 and read_holdz times.  The values were obtained
from the Compact Flash specification Rev 4.1.

Signed-off-by: David Daney <>


diff --git a/include/linux/libata.h b/include/linux/libata.h
index ed3f26e..95fa9f6 100644
--- a/include/linux/libata.h
+++ b/include/linux/libata.h
 enum ata_xfer_mask {
@@ -864,6 +868,8 @@ 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_holdz;      /* t6z */

Sorry for failing to notice this before but t6z is again the timing that the host can't control. Therefore I'm seeig no sense in its addition. I don't know how your driver is going to use it -- but most probably incorrectly...

MBR, Sergei

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