libahci: fix result_tf handling after an ATA PIO data-in command

[karo-tx-linux.git] / drivers / ata / libahci.c

diff --git a/drivers/ata/libahci.c b/drivers/ata/libahci.c
index 8eea309ea21231fcb50ff0498a366ff8a8a1dcf7..137514dbbf65a5e491295dbf1e23481ac6582aaf 100644 (file)
--- a/drivers/ata/libahci.c
+++ b/drivers/ata/libahci.c
@@ -1830,12 +1830,24 @@ static unsigned int ahci_qc_issue(struct ata_queued_cmd *qc)
 static bool ahci_qc_fill_rtf(struct ata_queued_cmd *qc)
 {
        struct ahci_port_priv *pp = qc->ap->private_data;
-       u8 *d2h_fis = pp->rx_fis + RX_FIS_D2H_REG;
+       u8 *rx_fis = pp->rx_fis;
 
        if (pp->fbs_enabled)
-               d2h_fis += qc->dev->link->pmp * AHCI_RX_FIS_SZ;
+               rx_fis += qc->dev->link->pmp * AHCI_RX_FIS_SZ;
+
+       /*
+        * After a successful execution of an ATA PIO data-in command,
+        * the device doesn't send D2H Reg FIS to update the TF and
+        * the host should take TF and E_Status from the preceding PIO
+        * Setup FIS.
+        */
+       if (qc->tf.protocol == ATA_PROT_PIO && qc->dma_dir == DMA_FROM_DEVICE &&
+           !(qc->flags & ATA_QCFLAG_FAILED)) {
+               ata_tf_from_fis(rx_fis + RX_FIS_PIO_SETUP, &qc->result_tf);
+               qc->result_tf.command = (rx_fis + RX_FIS_PIO_SETUP)[15];
+       } else
+               ata_tf_from_fis(rx_fis + RX_FIS_D2H_REG, &qc->result_tf);
 
-       ata_tf_from_fis(d2h_fis, &qc->result_tf);
        return true;
 }