On Fri, Apr 01, 2016 at 08:52:57AM +0100, Srinivas Kandagatla wrote: > On some SOCs PORTS_IMPL register value is never programmed by the > firmware and left at zero value. Which means that no sata ports are > available for software. AHCI driver used to cope up with this by > fabricating the port_map if the PORTS_IMPL register is read zero, > but recent patch broke this workaround as zero value was valid for > NVMe disks. > > This patch adds ports-implemented DT bindings as workaround for this issue > in a way that DT can can override the PORTS_IMPL register in cases where > the firmware did not program it already. > > Fixes: 566d1827df2e ("libata: disable forced PORTS_IMPL for >= AHCI 1.3) > Signed-off-by: Srinivas Kandagatla <srinivas.kandagatla@xxxxxxxxxx> > Acked-by: Tejun Heo <tj@xxxxxxxxxx> > Reviewed-by: Andy Gross <andy.gross@xxxxxxxxxx> > --- > Documentation/devicetree/bindings/ata/ahci-platform.txt | 4 ++++ > drivers/ata/ahci_platform.c | 3 +++ > 2 files changed, 7 insertions(+) Acked-by: Rob Herring <robh@xxxxxxxxxx> -- To unsubscribe from this list: send the line "unsubscribe devicetree" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html