[PATCH 2/2] phy: ti-pipe3: Fix EPROBE_DEFER handling for clock resources

[Hongling Zeng]

ti_pipe3_get_clk() has two issues with -EPROBE_DEFER error handling:

1. When devm_clk_get() for sysclk fails, the function returns -EINVAL
   instead of propagating the actual error code. This masks -EPROBE_DEFER
   to -EINVAL, breaking the probe deferral mechanism and causing permanent
   driver initialization failure on systems with non-deterministic probe
   ordering.

2. For SATA PHY refclk, the function ignores all errors to support older
   DTBs missing the refclk property. However, this incorrectly ignores
   -EPROBE_DEFER as well, causing the driver to proceed without waiting
   for the clock provider to become available.

Fix both issues:
- Return PTR_ERR(phy->sys_clk) instead of -EINVAL to propagate all
  error codes including -EPROBE_DEFER
- For SATA refclk, only ignore -ENOENT (clock not found in old DTBs)
  but propagate other errors like -EPROBE_DEFER

Fixes: a70143bbef6b ("drivers: phy: usb3/pipe3: Adapt pipe3 driver to Generic PHY Framework")
Fixes: 7f33912d2978 ("phy: ti-pipe3: Fix SATA across suspend/resume")
Signed-off-by: Hongling Zeng <zenghongling@xxxxxxxxxx>
---
 drivers/phy/ti/phy-ti-pipe3.c | 17 ++++++++++++-----
 1 file changed, 12 insertions(+), 5 deletions(-)

diff --git a/drivers/phy/ti/phy-ti-pipe3.c b/drivers/phy/ti/phy-ti-pipe3.c
index 58fbc3b27813..2bfcd0c70abd 100644
--- a/drivers/phy/ti/phy-ti-pipe3.c
+++ b/drivers/phy/ti/phy-ti-pipe3.c
@@ -604,15 +604,22 @@ static int ti_pipe3_get_clk(struct ti_pipe3 *phy)
 {
 	struct clk *clk;
 	struct device *dev = phy->dev;
+	int ret;
 
 	phy->refclk = devm_clk_get(dev, "refclk");
 	if (IS_ERR(phy->refclk)) {
-		dev_err(dev, "unable to get refclk\n");
+		ret = PTR_ERR(phy->refclk);
 		/* older DTBs have missing refclk in SATA PHY
-		 * so don't bail out in case of SATA PHY.
+		 * so don't bail out for -ENOENT, but still defer
+		 * probe for other errors like -EPROBE_DEFER.
 		 */
-		if (phy->mode != PIPE3_MODE_SATA)
-			return PTR_ERR(phy->refclk);
+		if (ret == -ENOENT) {
+			if (phy->mode != PIPE3_MODE_SATA)
+				return ret;
+		} else {
+			dev_err(dev, "unable to get refclk\n");
+			return ret;
+		}
 	}
 
 	if (phy->mode != PIPE3_MODE_SATA) {
@@ -629,7 +636,7 @@ static int ti_pipe3_get_clk(struct ti_pipe3 *phy)
 		phy->sys_clk = devm_clk_get(dev, "sysclk");
 		if (IS_ERR(phy->sys_clk)) {
 			dev_err(dev, "unable to get sysclk\n");
-			return -EINVAL;
+			return PTR_ERR(phy->sys_clk);
 		}
 	}
 
-- 
2.25.1