- newperiod = spi_period(sdev->sdev_target);
- period = newperiod > period ? newperiod : period;
- if (period < 0x0d)
- period++;
- else
- period += period >> 1;
-
- if (unlikely(period > 0xff || period == prevperiod)) {
- /* Total failure; set to async and return */
- SPI_PRINTK(sdev->sdev_target, KERN_ERR, "Domain Validation Failure, dropping back to Asynchronous\n");
- DV_SET(offset, 0);
- return SPI_COMPARE_FAILURE;
+
+ /* Here's the fallback sequence; first try turning off
+ * IU, then QAS (if we can control them), then finally
+ * fall down the periods */
+ if (i->f->set_iu && spi_iu(starget)) {
+ SPI_PRINTK(starget, KERN_ERR, "Domain Validation Disabing Information Units\n");
+ DV_SET(iu, 0);
+ } else if (i->f->set_qas && spi_qas(starget)) {
+ SPI_PRINTK(starget, KERN_ERR, "Domain Validation Disabing Quick Arbitration and Selection\n");
+ DV_SET(qas, 0);
+ } else {
+ newperiod = spi_period(starget);
+ period = newperiod > period ? newperiod : period;
+ if (period < 0x0d)
+ period++;
+ else
+ period += period >> 1;
+
+ if (unlikely(period > 0xff || period == prevperiod)) {
+ /* Total failure; set to async and return */
+ SPI_PRINTK(starget, KERN_ERR, "Domain Validation Failure, dropping back to Asynchronous\n");
+ DV_SET(offset, 0);
+ return SPI_COMPARE_FAILURE;
+ }
+ SPI_PRINTK(starget, KERN_ERR, "Domain Validation detected failure, dropping back\n");
+ DV_SET(period, period);
+ prevperiod = period;