On Wed, Aug 17, 2022 at 11:08:21PM +0000, Will McVicker wrote: > From: Sajid Dalvi <sdalvi@xxxxxxxxxx> > > Since the PCI spec requires a 10ms D3Hot delay (defined by > PCI_PM_D3HOT_WAIT) and a few of the PCI quirks update the D3Hot delay up > to 120ms, let's add support for both usleep_range and msleep based on > the delay time to improve the delay accuracy. > > This patch is based off of a commit from Sajid Dalvi <sdalvi@xxxxxxxxxx> > in the Pixel 6 kernel tree [1]. Testing on a Pixel 6, found that the > 10ms delay for the Exynos PCIe device was on average delaying for 19ms > when the spec requires 10ms. Switching from msleep to uslseep_range > therefore decreases the resume time on a Pixel 6 on average by 9ms. > > [1] https://android.googlesource.com/kernel/gs/+/18a8cad68d8e6d50f339a716a18295e6d987cee3 > > Signed-off-by: Sajid Dalvi <sdalvi@xxxxxxxxxx> > Signed-off-by: Will McVicker <willmcvicker@xxxxxxxxxx> Reviewed-by: Matthias Kaehlcke <mka@xxxxxxxxxxxx>
