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[25/28] phy: ti-pipe3: Fix suspend/resume and module reload

Message ID 1394270969-11851-26-git-send-email-kishon@ti.com
State Accepted
Commit 56042e4e975ce7b0817ebc024d02fa96ee01e107
Headers show

Commit Message

Kishon Vijay Abraham I March 8, 2014, 9:29 a.m. UTC 
From: Roger Quadros <rogerq@ti.com>

Due to Errata i783, SATA breaks if its DPLL is idled. The recommeded
workaround to issue a softreset to the SATA controller doesn't seem to
work. Here we just prevent SATA DPLL from Idling and hence avoid
the issue altogether.

Signed-off-by: Roger Quadros <rogerq@ti.com>
Signed-off-by: Kishon Vijay Abraham I <kishon@ti.com>
---
 drivers/phy/phy-ti-pipe3.c |    4 ++++
 1 file changed, 4 insertions(+)
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Patch

diff --git a/drivers/phy/phy-ti-pipe3.c b/drivers/phy/phy-ti-pipe3.c
index 12cc900..5913676 100644
--- a/drivers/phy/phy-ti-pipe3.c
+++ b/drivers/phy/phy-ti-pipe3.c
@@ -238,6 +238,10 @@  static int ti_pipe3_exit(struct phy *x)
 	u32 val;
 	unsigned long timeout;
 
+	/* SATA DPLL can't be powered down due to Errata i783 */
+	if (of_device_is_compatible(phy->dev->of_node, "ti,phy-pipe3-sata"))
+		return 0;
+
 	/* Put DPLL in IDLE mode */
 	val = ti_pipe3_readl(phy->pll_ctrl_base, PLL_CONFIGURATION2);
 	val |= PLL_IDLE;