From 28009852aa6b2d1574ba1bfd2461f274cb43fb49 Mon Sep 17 00:00:00 2001
From: "Edgar E. Iglesias" <edgar.iglesias@xilinx.com>
Date: Thu, 2 Apr 2020 15:47:18 +0200
Subject: [PATCH] dma/xlnx-zdma: Populate DBG0.CMN_BUF_FREE

Populate DBG0.CMN_BUF_FREE so that SW can see some free space.

Signed-off-by: Edgar E. Iglesias <edgar.iglesias@xilinx.com>
Reviewed-by: Alistair Francis <alistair.francis@wdc.com>
Reviewed-by: Francisco Iglesias <frasse.iglesias@gmail.com>
Message-id: 20200402134721.27863-3-edgar.iglesias@gmail.com
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
---
 hw/dma/xlnx-zdma.c | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/hw/dma/xlnx-zdma.c b/hw/dma/xlnx-zdma.c
index a6c5b2304a..6a4699757a 100644
--- a/hw/dma/xlnx-zdma.c
+++ b/hw/dma/xlnx-zdma.c
@@ -680,6 +680,12 @@ static RegisterAccessInfo zdma_regs_info[] = {
     },{ .name = "ZDMA_CH_DBG0",  .addr = A_ZDMA_CH_DBG0,
         .rsvd = 0xfffffe00,
         .ro = 0x1ff,
+
+        /*
+         * There's SW out there that will check the debug regs for free space.
+         * Claim that we always have 0x100 free.
+         */
+        .reset = 0x100
     },{ .name = "ZDMA_CH_DBG1",  .addr = A_ZDMA_CH_DBG1,
         .rsvd = 0xfffffe00,
         .ro = 0x1ff,