Please backport commit 440cec4ca1c2 ("drm/amdgpu: Wait for bootloader after PSPv11 reset") to v6.16.y

[Salvatore Bonaccorso <carnil@debian.org>]

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Hi

In Debian we got the report in https://bugs.debian.org/1114806 that
suspend to RAM fails (amdgpu driver hang) and Niklas Cathor was both
able to bisect the issue down to 8345a71fc54b ("drm/amdgpu: Add more
checks to PSP mailbox") (which was backported to 6.12.2 as well).

There is an upstream report as well at
https://gitlab.freedesktop.org/drm/amd/-/issues/4531 matching the
issue and fixed by 440cec4ca1c2 ("drm/amdgpu: Wait for bootloader
after PSPv11 reset").

Unfortunately the commit does not apply cleanly to 6.16.y as well as
there were the changes around 9888f73679b7 ("drm/amdgpu: Add a
noverbose flag to psp_wait_for").

Attached patch backports the commit due to this context changes,
assuming it is not desirable to pick as well 9888f73679b7.

Does that looks good? If yes, can you please consider picking it up or
the next 6.16.y stable series as well?

Regards,
Salvatore

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From 6e2bbc123bf09d2f98008722c61d3907f54a0611 Mon Sep 17 00:00:00 2001
From: Lijo Lazar <lijo.lazar@amd.com>
Date: Fri, 18 Jul 2025 18:50:58 +0530
Subject: [PATCH] drm/amdgpu: Wait for bootloader after PSPv11 reset

Commit 440cec4ca1c242d72e309a801995584a55af25c6 upstream.

Some PSPv11 SOCs take a longer time for PSP based mode-1 reset. Instead
of checking for C2PMSG_33 status, add the callback wait_for_bootloader.
Wait for bootloader to be back to steady state is already part of the
generic mode-1 reset flow. Increase the retry count for bootloader wait
and also fix the mask to prevent fake pass.

Fixes: 8345a71fc54b ("drm/amdgpu: Add more checks to PSP mailbox")
Closes: https://gitlab.freedesktop.org/drm/amd/-/issues/4531
Signed-off-by: Lijo Lazar <lijo.lazar@amd.com>
Reviewed-by: Alex Deucher <alexander.deucher@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
(cherry picked from commit 32f73741d6ee41fd5db8791c1163931e313d0fdc)
[Salvatore Bonaccorso: Backport for v6.16: Context changes for code
before 9888f73679b7 ("drm/amdgpu: Add a noverbose flag to psp_wait_for")]
Signed-off-by: Salvatore Bonaccorso <carnil@debian.org>
---
 drivers/gpu/drm/amd/amdgpu/psp_v11_0.c | 19 ++++---------------
 1 file changed, 4 insertions(+), 15 deletions(-)

diff --git a/drivers/gpu/drm/amd/amdgpu/psp_v11_0.c b/drivers/gpu/drm/amd/amdgpu/psp_v11_0.c
index 1a4a26e6ffd2..4cd37fe96c6e 100644
--- a/drivers/gpu/drm/amd/amdgpu/psp_v11_0.c
+++ b/drivers/gpu/drm/amd/amdgpu/psp_v11_0.c
@@ -149,13 +149,13 @@ static int psp_v11_0_wait_for_bootloader(struct psp_context *psp)
 	int ret;
 	int retry_loop;
 
-	for (retry_loop = 0; retry_loop < 10; retry_loop++) {
+	for (retry_loop = 0; retry_loop < 20; retry_loop++) {
 		/* Wait for bootloader to signify that is
 		    ready having bit 31 of C2PMSG_35 set to 1 */
 		ret = psp_wait_for(psp,
 				   SOC15_REG_OFFSET(MP0, 0, mmMP0_SMN_C2PMSG_35),
 				   0x80000000,
-				   0x80000000,
+				   0x8000FFFF,
 				   false);
 
 		if (ret == 0)
@@ -399,18 +399,6 @@ static int psp_v11_0_mode1_reset(struct psp_context *psp)
 
 	msleep(500);
 
-	offset = SOC15_REG_OFFSET(MP0, 0, mmMP0_SMN_C2PMSG_33);
-
-	ret = psp_wait_for(psp, offset, MBOX_TOS_RESP_FLAG, MBOX_TOS_RESP_MASK,
-			   false);
-
-	if (ret) {
-		DRM_INFO("psp mode 1 reset failed!\n");
-		return -EINVAL;
-	}
-
-	DRM_INFO("psp mode1 reset succeed \n");
-
 	return 0;
 }
 
@@ -666,7 +654,8 @@ static const struct psp_funcs psp_v11_0_funcs = {
 	.ring_get_wptr = psp_v11_0_ring_get_wptr,
 	.ring_set_wptr = psp_v11_0_ring_set_wptr,
 	.load_usbc_pd_fw = psp_v11_0_load_usbc_pd_fw,
-	.read_usbc_pd_fw = psp_v11_0_read_usbc_pd_fw
+	.read_usbc_pd_fw = psp_v11_0_read_usbc_pd_fw,
+	.wait_for_bootloader = psp_v11_0_wait_for_bootloader
 };
 
 void psp_v11_0_set_psp_funcs(struct psp_context *psp)
-- 
2.51.0