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authorTejun Heo <htejun@gmail.com>2007-01-21 02:10:11 +0900
committerJeff Garzik <jeff@garzik.org>2007-01-24 02:03:45 -0500
commit07c53dac4904206a50dd7c87adabbb1acff903fb (patch)
tree09fb7d1b53b4e6b5aabf05139ca8fff866e7e8d0
parentf740d1689d91415cfc749d17138a11ed03b7d38b (diff)
downloadblackbird-op-linux-07c53dac4904206a50dd7c87adabbb1acff903fb.tar.gz
blackbird-op-linux-07c53dac4904206a50dd7c87adabbb1acff903fb.zip
ahci: don't enter slumber on power down
Some ATA/ATAPI devices act weirdly after the link is put into slumber mode. Some hang completely requiring physical power removal while others fail to wake up till the link is hardreset a couple of times. The addition of slumber on power down was never driven by real need. It just followed what ahci spec said literally. The spec itself seems faulty in that it doesn't consider devices (not controllers) which don't support link powersaving mode. Theory never matches reality when it comes to dark allys of cheap ATA/ATAPI world. It's just unrealistic to expect vendors to test rarely used link powersaving feature rigorously. This patch makes ahci more friendly to the coldness of reality. This shouldn't have any negative effect - when suspend operation succeeds, we power off the whole machine; otherwise, we wake up everything. I can't see any reason to be so elaborate with powering down the link in the first place. Signed-off-by: Tejun Heo <htejun@gmail.com> Signed-off-by: Jeff Garzik <jeff@garzik.org>
-rw-r--r--drivers/ata/ahci.c37
1 files changed, 10 insertions, 27 deletions
diff --git a/drivers/ata/ahci.c b/drivers/ata/ahci.c
index bd241767caea..e3c7b312287a 100644
--- a/drivers/ata/ahci.c
+++ b/drivers/ata/ahci.c
@@ -586,35 +586,18 @@ static void ahci_power_down(void __iomem *port_mmio, u32 cap)
{
u32 cmd, scontrol;
- cmd = readl(port_mmio + PORT_CMD) & ~PORT_CMD_ICC_MASK;
-
- if (cap & HOST_CAP_SSC) {
- /* enable transitions to slumber mode */
- scontrol = readl(port_mmio + PORT_SCR_CTL);
- if ((scontrol & 0x0f00) > 0x100) {
- scontrol &= ~0xf00;
- writel(scontrol, port_mmio + PORT_SCR_CTL);
- }
-
- /* put device into slumber mode */
- writel(cmd | PORT_CMD_ICC_SLUMBER, port_mmio + PORT_CMD);
-
- /* wait for the transition to complete */
- ata_wait_register(port_mmio + PORT_CMD, PORT_CMD_ICC_SLUMBER,
- PORT_CMD_ICC_SLUMBER, 1, 50);
- }
+ if (!(cap & HOST_CAP_SSS))
+ return;
- /* put device into listen mode */
- if (cap & HOST_CAP_SSS) {
- /* first set PxSCTL.DET to 0 */
- scontrol = readl(port_mmio + PORT_SCR_CTL);
- scontrol &= ~0xf;
- writel(scontrol, port_mmio + PORT_SCR_CTL);
+ /* put device into listen mode, first set PxSCTL.DET to 0 */
+ scontrol = readl(port_mmio + PORT_SCR_CTL);
+ scontrol &= ~0xf;
+ writel(scontrol, port_mmio + PORT_SCR_CTL);
- /* then set PxCMD.SUD to 0 */
- cmd &= ~PORT_CMD_SPIN_UP;
- writel(cmd, port_mmio + PORT_CMD);
- }
+ /* then set PxCMD.SUD to 0 */
+ cmd = readl(port_mmio + PORT_CMD) & ~PORT_CMD_ICC_MASK;
+ cmd &= ~PORT_CMD_SPIN_UP;
+ writel(cmd, port_mmio + PORT_CMD);
}
static void ahci_init_port(void __iomem *port_mmio, u32 cap,
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