Hello, all. This is the second take of polling-IDENTIFY patchset. Other than rebased on the current upstream, nothing has changed since the last take[L]. Some SATA and many PATA controllers don't have reliable way to detect device presence and some controllers report master device's signature as slave's if slave isn't present. This sometimes results in failure to detect devices and at other times phantom devices which cause considerable delay during boot. This patchset implements device detection via polling IDENTIFY, which is used by IDE and was used by old libata. When no device present, !BSY && !DRQ status is seen while trying to read the IDENTIFY block. If a LLD specifies ATA_FLAG_DETECT_POLLING, IDENTIFY command is issued using polling PIO and the HSM marks AC_ERR_NODEV_HINT if !BSY && !DRQ is met. Then the probing logic marks the device non-existent silently and continues probing. ata_piix is having a lot of problem involving missing and/or phantom devices and converted to use polling IDENTIFY by this patchset. This patchset contains 6 patches. #01-02 : prep for ATA_FLAG_DETECT_POLLING implementation #03 : implement ATA_DETECT_POLLING #04 : apply ATA_DETECT_POLLING to ata_piix #05 : kill unnecessary parts from ata_piix This patchset is against upstream (cfd15b0011498986ef14b6c53f5eaba89d2171f3) Thanks. -- tejun [L] http://thread.gmane.org/gmane.linux.ide/13284/focus=13284 - To unsubscribe from this list: send the line "unsubscribe linux-ide" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
