soc: ti: qmss: make acc queue support optional in the driver

acc channels are available only if accumulator PDSP is loaded and
running in the SoC. As this requires firmware and user may not have
firmware in the file system, make the accumulator queue support
available in qmss driver optional. To use accumulator queus user needs
to add firmware to the file system and boot up kernel.

Signed-off-by: Murali Karicheri <m-karicheri2@ti.com>
Signed-off-by: Santosh Shilimkar <ssantosh@kernel.org>

1 files changed, 6 insertions, 0 deletions

diff --git a/Documentation/arm/keystone/knav-qmss.txt b/Documentation/arm/keystone/knav-qmss.txt
index da34a5babfbe..fcdb9fd5f53a 100644
--- a/Documentation/arm/keystone/knav-qmss.txt
+++ b/Documentation/arm/keystone/knav-qmss.txt
@@ -48,3 +48,9 @@ in the file system and boot up the kernel. User would see
  "firmware file ks2_qmss_pdsp_acc48.bin downloaded for PDSP"
 
 in the boot up log if loading of firmware to PDSP is successful.
+
+Use of accumulated queues requires the firmware image to be present in the
+file system. The driver doesn't acc queues to the supported queue range if
+PDSP is not running in the SoC. The API call fails if there is a queue open
+request to an acc queue and PDSP is not running. So make sure to copy firmware
+to file system before using these queue types.