Hi Lorenzo, Lorenzo Pieralisi <lorenzo.pieralisi@xxxxxxx> wrote on Wed, 23 Jan 2019 17:05:09 +0000: > On Tue, Jan 08, 2019 at 05:24:25PM +0100, Miquel Raynal wrote: > > Hello, > > > > As part of an effort to bring suspend to RAM support to Armada 3700 > > SoCs (main target: ESPRESSObin), this series handles the work around > > the PCIe IP. > > > > First, more configuration is done in the 'setup' helper as inspired > > from the U-Boot driver. This is needed to entirely initialize the IP > > during future resume operation (patch 1). > > > > Then, reset GPIO, PHY and clock support are introduced (patch 2-4). As > > current device trees do not provide the corresponding properties, not > > finding one of these properties is not an error and just produces a > > warning. However, if the property is present, an error during PHY > > initialization will fail the probe of the driver. > > > > Note: To be sure the clock will be resumed before this driver, a first > > series adding links between clocks and consumers has been submitted, > > see [1]. Anyway, having the clock series applied first is not needed. > > I do not understand what this means, in particular in relation > to the blocking clock calls in the suspend/resume NOIRQ hooks. I am not sure to understand your question. As there are multiple points in this sentence I will detail each of them so please comment on the one which is bothering you: * I am working in parallel on a series adding device links to the clock framework. This way when a driver consumes a clock, the clock provider driver will be resumed first. * If the clock series I am talking about is applied after this one, there is no build issue. Of course suspending the platform may not work but this is a new feature so nothing will be broken. * Device links do not enforce any priority if the suspend/resume phase between two drivers is not the same. The PCIe driver suspends in the NOIRQ phase. If we want the clock driver to suspend *after* PCIe, its suspend/resume callbacks must be promoted to the NOIRQ phase as well (and this is part of another series). As of today there is no alternative. Thanks, Miquèl
