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Commit f88c480d authored by sonic zhang's avatar sonic zhang Committed by Jeff Garzik
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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: default avatarSonic Zhang <sonic.zhang@analog.com>
Signed-off-by: default avatarJeff Garzik <jeff@garzik.org>
parent 92d499d9

drivers/ata/pata_bf54x.c

+7 −0
Original line number Diff line number Diff line
@@ -1489,6 +1489,8 @@ static int __devinit bfin_atapi_probe(struct platform_device *pdev) 
	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(struct platform_device *pdev) 
	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..

	 */