On Sun, Dec 26, 2021 at 1:45 PM Gabriel L. Somlo <gsomlo@xxxxxxxxx> wrote: > > Hi Andy, > > Thanks for the feedback! > > On Sat, Dec 25, 2021 at 06:43:22PM +0200, Andy Shevchenko wrote: > > On Wed, Dec 15, 2021 at 10:00 PM Gabriel Somlo <gsomlo@xxxxxxxxx> wrote: > > > > > > LiteX (https://github.com/enjoy-digital/litex) is a SoC framework > > > that targets FPGAs. LiteSDCard is a small footprint, configurable > > > SDCard core commonly used in LiteX designs. > > > > > > The driver was first written in May 2020 and has been maintained > > > cooperatively by the LiteX community. Thanks to all contributors! > > > > ... > > > > > + int ret; > > > + > > > + host->irq = platform_get_irq_optional(host->dev, 0); > > > + if (host->irq <= 0) { > > > + dev_warn(dev, "Failed to get IRQ, using polling\n"); > > > + goto use_polling; > > > + } > > > > [Same comment as per v3.] > > > This is wrong. It missed the deferred probe, for example. > > > > The best approach is > > > > ret = platform_get_irq_optional(...); > > if (ret < 0 && ret != -ENXIO) > > return ret; > > if (ret > 0) > > ...we got it... > > > > It will allow the future API fix of platform_get_irq_optional() to be > > really optional. > > Thanks for the example. I still need to work in a decision to use > polling, though. How about something like this instead: > > ret = platform_get_irq_optional(...); > if (ret == -ENXIO) > goto use_polling; > if (ret < 0) > return ret; // deferred probe (-EAGAIN likely?) > if (ret > 0) > ...we got it, keep going... > > > > > ... > > > > > +#ifdef CONFIG_ARCH_DMA_ADDR_T_64BIT > > > > Why under ifdeffery? > > Because I only want to do it on 64-bit capable architectures. > > The alternative would be to call > > dma_set_mask_and_coherent(&pdev->dev, DMA_BIT_MASK(64)); > > on *all* architectures, but ignore the returned error (-EIO, > presumably on architetures that only support 32-bit DMA). > > Do you think that would be cleaner? > > Thanks, > --Gabriel > > > > + /* increase from default 32 on 64-bit-DMA capable architectures */ > > > + ret = dma_set_mask_and_coherent(&pdev->dev, DMA_BIT_MASK(64)); > > > + if (ret) > > > + goto err; > > > +#endif > > > > With Best Regards, > > Andy Shevchenko -- With Best Regards, Andy Shevchenko
