On Fri, Apr 25, 2025 at 6:20 PM Greg Kroah-Hartman gregkh@linuxfoundation.org wrote:
On Fri, Apr 25, 2025 at 06:11:11PM +0400, Alexey Charkov wrote:
Device tree bindings state that the clock is optional for UHCI platform controllers, and some existing device trees don't provide those - such as those for VIA/WonderMedia devices.
The driver however fails to probe now if no clock is provided, because devm_clk_get returns an error pointer in such case.
Switch to devm_clk_get_optional instead, so that it could probe again on those platforms where no clocks are given.
Cc: stable@vger.kernel.org Fixes: 26c502701c52 ("usb: uhci: Add clk support to uhci-platform") Signed-off-by: Alexey Charkov alchark@gmail.com
drivers/usb/host/uhci-platform.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/drivers/usb/host/uhci-platform.c b/drivers/usb/host/uhci-platform.c index a7c934404ebc7ed74f64265fafa7830809979ba5..62318291f5664c9ec94f24535c71d962e28354f3 100644 --- a/drivers/usb/host/uhci-platform.c +++ b/drivers/usb/host/uhci-platform.c @@ -121,7 +121,7 @@ static int uhci_hcd_platform_probe(struct platform_device *pdev) }
/* Get and enable clock if any specified */
uhci->clk = devm_clk_get(&pdev->dev, NULL);
uhci->clk = devm_clk_get_optional(&pdev->dev, NULL);Why does this need to go to all stable trees all of a sudden? This has been "broken" for years, what changed recently to cause this to show up?
Users who suffer from nonfunctional built-in keyboards on WM8650 and WM8850 based laptops complain. It used to work on even older kernels, but not on current ones. What changed is that I found the time to investigate :)
The way 26c502701c52 ("usb: uhci: Add clk support to uhci-platform") described the change implies that "optional" was the intended behavior from the outset, so I believe it deserves a backport. Don't know if the age of a regression prevents it from being considered a regression or not.
Best regards, Alexey