Re: [patch 5/7] xenon: add SATA support

Sergei Shtylyov wrote:

Felix Domke wrote:

quoted

This adds support for the HDD and DVD SATA controller on the xenon
southbridge.

  Pleas post this to linux-ide@vger.kernel.org in the future.

I'll do.

quoted

It also disables ATA_TFLAG_POLLING in libata-core, which prevented the
DVD drive
from being detected. It needs to be investigated what exactly is wrong
here. 

quoted

     tf.protocol = ATA_PROT_PIO;
-    tf.flags |= ATA_TFLAG_POLLING; /* for polling presence detection */
+//    tf.flags |= ATA_TFLAG_POLLING; /* for polling presence
detection */

   I doubt that this could *ever* get accepted.

It was not meant to be accepted, but to work around the problem which
was introduced in 2.6.19. I have far too less knowledge of the SATA
layer to understand why this flag exactly causes the detection of the
DVD-Drive fail.

As said, this needs to be investigated, and fixed (in the driver, of
course, not in the subsystem).

quoted

+static unsigned int get_scr_cfg_addr(unsigned int port_no, unsigned
int sc_reg, int device)
+{
+    unsigned int addr = SIS_SCR_BASE + (4 * sc_reg);
+

   Why we need device and port_no arguments here?

As there is only one device/port per PCI device, the arguments should
probably be removed from this function, right.

quoted

+    if (sc_reg == SCR_ERROR) /* doesn't exist in PCI cfg space */
+        return 0; /* assume no error */

   Since SCR_ERROR == 1, this check seems broken.

Why?


Felix