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-rw-r--r--drivers/ata/ahci.h2
-rw-r--r--drivers/ata/libahci.c3
2 files changed, 4 insertions, 1 deletions
diff --git a/drivers/ata/ahci.h b/drivers/ata/ahci.h
index ee176e4af97a..8b61123d2c3c 100644
--- a/drivers/ata/ahci.h
+++ b/drivers/ata/ahci.h
@@ -249,6 +249,8 @@ enum {
#endif
AHCI_HFLAG_WAKE_BEFORE_STOP = (1 << 22), /* wake before DMA stop */
AHCI_HFLAG_YES_ALPM = (1 << 23), /* force ALPM cap on */
+ AHCI_HFLAG_NO_WRITE_TO_RO = (1 << 24), /* don't write to read
+ only registers */
/* ap->flags bits */
diff --git a/drivers/ata/libahci.c b/drivers/ata/libahci.c
index 4462f8a8cf2c..3e286d86ab42 100644
--- a/drivers/ata/libahci.c
+++ b/drivers/ata/libahci.c
@@ -945,7 +945,8 @@ int ahci_reset_controller(struct ata_host *host)
/* Some registers might be cleared on reset. Restore
* initial values.
*/
- ahci_restore_initial_config(host);
+ if (!(hpriv->flags & AHCI_HFLAG_NO_WRITE_TO_RO))
+ ahci_restore_initial_config(host);
} else
dev_info(host->dev, "skipping global host reset\n");