From 93002849ffc7d1f12db60a37c30610d02844363b Mon Sep 17 00:00:00 2001
From: Evan Quan <evan.quan@amd.com>
Date: Tue, 16 Jul 2019 14:20:22 +0800
Subject: [PATCH] drm/amd/powerplay: maintain SMU FW backward compatibility
Do not halt driver loading on if_version mismatch. As our
driver and FWs are backward compatible.
Signed-off-by: Evan Quan <evan.quan@amd.com>
Reviewed-by: Kenneth Feng <kenneth.feng@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
---
drivers/gpu/drm/amd/powerplay/smu_v11_0.c | 12 +++++++++---
1 file changed, 9 insertions(+), 3 deletions(-)
diff --git a/drivers/gpu/drm/amd/powerplay/smu_v11_0.c b/drivers/gpu/drm/amd/powerplay/smu_v11_0.c
index f182d75e127de..95c7c4dae5236 100644
--- a/drivers/gpu/drm/amd/powerplay/smu_v11_0.c
+++ b/drivers/gpu/drm/amd/powerplay/smu_v11_0.c
@@ -261,14 +261,20 @@ static int smu_v11_0_check_fw_version(struct smu_context *smu)
smu_minor = (smu_version >> 8) & 0xff;
smu_debug = (smu_version >> 0) & 0xff;
-
+ /*
+ * 1. if_version mismatch is not critical as our fw is designed
+ * to be backward compatible.
+ * 2. New fw usually brings some optimizations. But that's visible
+ * only on the paired driver.
+ * Considering above, we just leave user a warning message instead
+ * of halt driver loading.
+ */
if (if_version != smu->smc_if_version) {
pr_info("smu driver if version = 0x%08x, smu fw if version = 0x%08x, "
"smu fw version = 0x%08x (%d.%d.%d)\n",
smu->smc_if_version, if_version,
smu_version, smu_major, smu_minor, smu_debug);
- pr_err("SMU driver if version not matched\n");
- ret = -EINVAL;
+ pr_warn("SMU driver if version not matched\n");
}
return ret;
--
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