From: jsg <jsg@openbsd.org>
Date: Thu, 23 Feb 2023 02:17:38 +0000 (+0000)
Subject: drm/amd/display: Reset DMUB mailbox SW state after HW reset
X-Git-Url: http://artulab.com/gitweb/?a=commitdiff_plain;h=6150e7082e0bd0464b45c9c00a0009624b0de6cb;p=openbsd

drm/amd/display: Reset DMUB mailbox SW state after HW reset

From Nicholas Kazlauskas
488770cbddd8a873fb3bb8866e8a46211570c367 in linux-6.1.y/6.1.13
154711aa5759ef9b45903124fa813c4c29ee681c in mainline linux
---

diff --git a/sys/dev/pci/drm/amd/display/dmub/src/dmub_srv.c b/sys/dev/pci/drm/amd/display/dmub/src/dmub_srv.c
index 4a122925c3a..92c18bfb98b 100644
--- a/sys/dev/pci/drm/amd/display/dmub/src/dmub_srv.c
+++ b/sys/dev/pci/drm/amd/display/dmub/src/dmub_srv.c
@@ -532,6 +532,9 @@ enum dmub_status dmub_srv_hw_init(struct dmub_srv *dmub,
 	if (dmub->hw_funcs.reset)
 		dmub->hw_funcs.reset(dmub);
 
+	/* reset the cache of the last wptr as well now that hw is reset */
+	dmub->inbox1_last_wptr = 0;
+
 	cw0.offset.quad_part = inst_fb->gpu_addr;
 	cw0.region.base = DMUB_CW0_BASE;
 	cw0.region.top = cw0.region.base + inst_fb->size - 1;
@@ -649,6 +652,15 @@ enum dmub_status dmub_srv_hw_reset(struct dmub_srv *dmub)
 	if (dmub->hw_funcs.reset)
 		dmub->hw_funcs.reset(dmub);
 
+	/* mailboxes have been reset in hw, so reset the sw state as well */
+	dmub->inbox1_last_wptr = 0;
+	dmub->inbox1_rb.wrpt = 0;
+	dmub->inbox1_rb.rptr = 0;
+	dmub->outbox0_rb.wrpt = 0;
+	dmub->outbox0_rb.rptr = 0;
+	dmub->outbox1_rb.wrpt = 0;
+	dmub->outbox1_rb.rptr = 0;
+
 	dmub->hw_init = false;
 
 	return DMUB_STATUS_OK;