Set proper ATA UDMA mode for bf548 according to system clock. (f88c480d) · Commits · 戴 / test

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@analog.com> Signed-off-by:

Jeff Garzik <jeff@garzik.org>

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..
		*/

Admin message