[Qemu-devel] [PATCH 02/11] ATAPI: STARTSTOPUNIT only eject/load media if powercondition is 0

[Kevin Wolf <kwolf@redhat.com>]

From: Ronnie Sahlberg <ronniesahlberg@gmail.com>

The START STOP UNIT command will only eject/load media if
power condition is zero.

If power condition is !0 then LOEJ and START will be ignored.

>From MMC (sbc contains similar wordings too)
  The Power Conditions field requests the block device to be placed
  in the power condition defined in
  Table 558. If this field has a value other than 0h then the Start
  and LoEj bits shall be ignored.

Signed-off-by: Ronnie Sahlberg <ronniesahlberg@gmail.com>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>
---
 hw/ide/atapi.c |    6 ++++++
 1 files changed, 6 insertions(+), 0 deletions(-)

diff --git a/hw/ide/atapi.c b/hw/ide/atapi.c
index f7f714c..685cbaa 100644
--- a/hw/ide/atapi.c
+++ b/hw/ide/atapi.c
@@ -875,6 +875,12 @@ static void cmd_start_stop_unit(IDEState *s, uint8_t* buf)
     int sense;
     bool start = buf[4] & 1;
     bool loej = buf[4] & 2;     /* load on start, eject on !start */
+    int pwrcnd = buf[4] & 0xf0;
+
+    if (pwrcnd) {
+        /* eject/load only happens for power condition == 0 */
+        return;
+    }
 
     if (loej) {
         if (!start && !s->tray_open && s->tray_locked) {
-- 
1.7.6.5