linux-kernel - [PATCH] [libata] Set proper ATA UDMA mode for bf548 according to system clock.

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Message-Id: <1196138859.6974.2.camel@eight.analog.com>
Date:	Tue, 27 Nov 2007 12:47:39 +0800
From:	sonic zhang <sonic.adi@...il.com>
To:	Linux IDE <linux-ide@...r.kernel.org>,
	Linux Kernel <linux-kernel@...r.kernel.org>
Cc:	Jeff Garzik <jeff@...zik.org>
Subject: [PATCH] [libata] Set proper ATA UDMA mode for bf548 according to
	system clock.

UDMA Mode - Frequency compatibility

UDMA5 - 100 MB/s   - SCLK  = 133 MHz
UDMA4 - 66 MB/s    - SCLK >=  80 MHz
UDMA3 - 44.4 MB/s  - SCLK >=  50 MHz
UDMA2 - 33 MB/s    - SCLK >=  40 MHz


Signed-off-by: Sonic Zhang <sonic.zhang@...log.com>
---
 drivers/ata/pata_bf54x.c |    7 +++++++
 1 files changed, 7 insertions(+), 0 deletions(-)

diff --git a/drivers/ata/pata_bf54x.c b/drivers/ata/pata_bf54x.c
index 81db405..088a41f 100644
--- a/drivers/ata/pata_bf54x.c
+++ b/drivers/ata/pata_bf54x.c
@@ -1489,6 +1489,8 @@ static int __devinit bfin_atapi_probe(st
 	int board_idx = 0;
 	struct resource *res;
 	struct ata_host *host;
+	unsigned int fsclk = get_sclk();
+	int udma_mode = 5;
 	const struct ata_port_info *ppi[] =
 		{ &bfin_port_info[board_idx], NULL };
 
@@ -1507,6 +1509,11 @@ static int __devinit bfin_atapi_probe(st
 	if (res == NULL)
 		return -EINVAL;
 
+	while (bfin_port_info[board_idx].udma_mask>0 && udma_fsclk[udma_mode] > fsclk) {
+		udma_mode--;
+		bfin_port_info[board_idx].udma_mask >>= 1;
+	}
+
 	/*
 	 * Now that that's out of the way, wire up the port..
 	 */
-- 
1.4.3.4


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