From mboxrd@z Thu Jan 1 00:00:00 1970 From: sonic zhang Subject: [PATCH] [libata] Set proper ATA UDMA mode for bf548 according to system clock. Date: Tue, 27 Nov 2007 12:47:39 +0800 Message-ID: <1196138859.6974.2.camel@eight.analog.com> Mime-Version: 1.0 Content-Type: text/plain Content-Transfer-Encoding: 7bit Return-path: Received: from nwd2mail10.analog.com ([137.71.25.55]:17722 "EHLO nwd2mail10.analog.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753432AbXK0EuH (ORCPT ); Mon, 26 Nov 2007 23:50:07 -0500 Sender: linux-ide-owner@vger.kernel.org List-Id: linux-ide@vger.kernel.org To: Linux IDE , Linux Kernel Cc: Jeff Garzik 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 --- 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