From 8573fcdff5bfcf622712a0af1954200c242a1d6a Mon Sep 17 00:00:00 2001 From: Kai-Heng Feng Date: Fri, 5 Jul 2019 12:55:03 +0800 Subject: [PATCH] mfd: intel-lpss: Remove D3cold delay [ Upstream commit 76380a607ba0b28627c9b4b55cd47a079a59624b ] Goodix touchpad may drop its first couple input events when i2c-designware-platdrv and intel-lpss it connects to took too long to runtime resume from runtime suspended state. This issue happens becuase the touchpad has a rather small buffer to store up to 13 input events, so if the host doesn't read those events in time (i.e. runtime resume takes too long), events are dropped from the touchpad's buffer. The bottleneck is D3cold delay it waits when transitioning from D3cold to D0, hence remove the delay to make the resume faster. I've tested some systems with intel-lpss and haven't seen any regression. Bugzilla: https://bugzilla.kernel.org/show_bug.cgi?id=202683 Signed-off-by: Kai-Heng Feng Reviewed-by: Andy Shevchenko Signed-off-by: Lee Jones Signed-off-by: Sasha Levin --- drivers/mfd/intel-lpss-pci.c | 2 ++ 1 file changed, 2 insertions(+) diff --git a/drivers/mfd/intel-lpss-pci.c b/drivers/mfd/intel-lpss-pci.c index 9ff243970e93..5b41111e62fd 100644 --- a/drivers/mfd/intel-lpss-pci.c +++ b/drivers/mfd/intel-lpss-pci.c @@ -39,6 +39,8 @@ static int intel_lpss_pci_probe(struct pci_dev *pdev, info->mem = &pdev->resource[0]; info->irq = pdev->irq; + pdev->d3cold_delay = 0; + /* Probably it is enough to set this for iDMA capable devices only */ pci_set_master(pdev);