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Message-ID: <20151027020035.GC11691@vkoul-mobl.iind.intel.com> Date: Tue, 27 Oct 2015 11:00:36 +0900 From: Vinod Koul <vinod.koul@...el.com> To: Yuan Yao <yao.yuan@...escale.com> Cc: stefan@...er.ch, arnd@...db.de, dan.j.williams@...el.com, dmaengine@...r.kernel.org, linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org Subject: Re: [PATCH v3] dmaengine: fsl-edma: add PM suspend/resume support On Mon, Oct 19, 2015 at 04:31:05PM +0800, Yuan Yao wrote: The patch overall looks fine, but > > +static int fsl_edma_suspend_late(struct device *dev) This needs protection and will have build failure when CONFIG_PM is not defined > +{ > + struct fsl_edma_engine *fsl_edma = dev_get_drvdata(dev); > + struct fsl_edma_chan *fsl_chan; > + unsigned long flags; > + int i; > + > + for (i = 0; i < fsl_edma->n_chans; i++) { > + fsl_chan = &fsl_edma->chans[i]; > + spin_lock_irqsave(&fsl_chan->vchan.lock, flags); > + /* Make sure chan is idle or will force disable. */ > + if (unlikely(!fsl_chan->idle)) { > + dev_warn(dev, "WARN: There is non-idle channel."); > + fsl_edma_disable_request(fsl_chan); > + fsl_edma_chan_mux(fsl_chan, 0, false); > + } > + > + fsl_chan->pm_state = SUSPENDED; > + spin_unlock_irqrestore(&fsl_chan->vchan.lock, flags); > + } > + > + return 0; > +} > + > +static int fsl_edma_resume_early(struct device *dev) > +{ > + struct fsl_edma_engine *fsl_edma = dev_get_drvdata(dev); > + struct fsl_edma_chan *fsl_chan; > + int i; > + > + for (i = 0; i < fsl_edma->n_chans; i++) { > + fsl_chan = &fsl_edma->chans[i]; > + fsl_chan->pm_state = RUNNING; > + edma_writew(fsl_edma, 0x0, fsl_edma->membase + EDMA_TCD_CSR(i)); > + if (fsl_chan->slave_id != 0) > + fsl_edma_chan_mux(fsl_chan, fsl_chan->slave_id, true); > + } > + > + edma_writel(fsl_edma, EDMA_CR_ERGA | EDMA_CR_ERCA, > + fsl_edma->membase + EDMA_CR); > + > + return 0; > +} > + > +static const struct dev_pm_ops fsl_edma_pm_ops = { > + .suspend_late = fsl_edma_suspend_late, > + .resume_early = fsl_edma_resume_early, > +}; This one too, also why use late and early, pls add the note here > static const struct of_device_id fsl_edma_dt_ids[] = { > { .compatible = "fsl,vf610-edma", }, > { /* sentinel */ } > @@ -969,6 +1042,7 @@ static struct platform_driver fsl_edma_driver = { > .driver = { > .name = "fsl-edma", > .of_match_table = fsl_edma_dt_ids, > + .pm = &fsl_edma_pm_ops, This will fail too if CONFIG_PM is not defined -- ~Vinod -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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