On Wed, Aug 23, 2017 at 10:41:18AM +0800, Yong wrote: > > > > > +static irqreturn_t sun6i_csi_isr(int irq, void *dev_id) > > > > > +{ > > > > > + struct sun6i_csi_dev *sdev = (struct sun6i_csi_dev *)dev_id; > > > > > + struct regmap *regmap = sdev->regmap; > > > > > + u32 status; > > > > > + > > > > > + regmap_read(regmap, CSI_CH_INT_STA_REG, &status); > > > > > + > > > > > + if ((status & CSI_CH_INT_STA_FIFO0_OF_PD) || > > > > > + (status & CSI_CH_INT_STA_FIFO1_OF_PD) || > > > > > + (status & CSI_CH_INT_STA_FIFO2_OF_PD) || > > > > > + (status & CSI_CH_INT_STA_HB_OF_PD)) { > > > > > + regmap_write(regmap, CSI_CH_INT_STA_REG, status); > > > > > + regmap_update_bits(regmap, CSI_EN_REG, CSI_EN_CSI_EN, > > > > > 0); > > > > > + regmap_update_bits(regmap, CSI_EN_REG, CSI_EN_CSI_EN, > > > > > + CSI_EN_CSI_EN); > > > > > > > > You need to enable / disable it at every frame? How do you deal with > > > > double buffering? (or did you choose to ignore it for now?) > > > > > > These *_OF_PD status bits indicate an overflow error condition. > > > > Shouldn't we return an error code then? The names of these flags could > > be better too. > > Then, where and how to deal with the error coce.
If you want to deal with FIFO overflow, I'm not sure you have anything to do. It means, you've been to slow to queue buffers, so I guess stopping the pipeline until more buffers are queued would make sense. And we should probably increase the sequence number while doing so to notify the userspace that some frames were lost. Maxime -- Maxime Ripard, Free Electrons Embedded Linux and Kernel engineering http://free-electrons.com -- You received this message because you are subscribed to the Google Groups "linux-sunxi" group. To unsubscribe from this group and stop receiving emails from it, send an email to linux-sunxi+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/d/optout.
signature.asc
Description: PGP signature