linux-kernel - [PATCH 14/64] pata_cypress: fix PIO timings underclocking

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Date:	Mon, 18 Jan 2010 18:15:47 +0100
From:	Bartlomiej Zolnierkiewicz <bzolnier@...il.com>
To:	linux-ide@...r.kernel.org
Cc:	Bartlomiej Zolnierkiewicz <bzolnier@...il.com>,
	linux-kernel@...r.kernel.org
Subject: [PATCH 14/64] pata_cypress: fix PIO timings underclocking

From: Bartlomiej Zolnierkiewicz <bzolnier@...il.com>
Subject: [PATCH] pata_cypress: fix PIO timings underclocking

Timing registers should be programmed with the desired number of clocks
minus one clock.

Signed-off-by: Bartlomiej Zolnierkiewicz <bzolnier@...il.com>
---
 drivers/ata/pata_cypress.c |   10 ++++++----
 1 file changed, 6 insertions(+), 4 deletions(-)

Index: b/drivers/ata/pata_cypress.c
===================================================================
--- a/drivers/ata/pata_cypress.c
+++ b/drivers/ata/pata_cypress.c
@@ -62,14 +62,16 @@ static void cy82c693_set_piomode(struct
 		return;
 	}
 
-	time_16 = clamp_val(t.recover, 0, 15) | (clamp_val(t.active, 0, 15) << 4);
-	time_8 = clamp_val(t.act8b, 0, 15) | (clamp_val(t.rec8b, 0, 15) << 4);
+	time_16 = clamp_val(t.recover - 1, 0, 15) |
+		  (clamp_val(t.active - 1, 0, 15) << 4);
+	time_8 = clamp_val(t.act8b - 1, 0, 15) |
+		 (clamp_val(t.rec8b - 1, 0, 15) << 4);
 
 	if (adev->devno == 0) {
 		pci_read_config_dword(pdev, CY82_IDE_ADDRSETUP, &addr);
 
 		addr &= ~0x0F;	/* Mask bits */
-		addr |= clamp_val(t.setup, 0, 15);
+		addr |= clamp_val(t.setup - 1, 0, 15);
 
 		pci_write_config_dword(pdev, CY82_IDE_ADDRSETUP, addr);
 		pci_write_config_byte(pdev, CY82_IDE_MASTER_IOR, time_16);
@@ -79,7 +81,7 @@ static void cy82c693_set_piomode(struct
 		pci_read_config_dword(pdev, CY82_IDE_ADDRSETUP, &addr);
 
 		addr &= ~0xF0;	/* Mask bits */
-		addr |= (clamp_val(t.setup, 0, 15) << 4);
+		addr |= (clamp_val(t.setup - 1, 0, 15) << 4);
 
 		pci_write_config_dword(pdev, CY82_IDE_ADDRSETUP, addr);
 		pci_write_config_byte(pdev, CY82_IDE_SLAVE_IOR, time_16);
--
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