From e6ab831267f427da8c70b7edacb1d5b0d2fc7d6f Mon Sep 17 00:00:00 2001
From: Michael Walle <michael@walle.cc>
Date: Fri, 18 Jun 2021 14:04:33 +0200
Subject: drm/etnaviv: add clock gating workaround for GC7000 r6202
Git-commit: 432f51e7deedadceaf99a953a6f0a7b30c8155f9
Patch-mainline: v5.15-rc1
References: jsc#PED-1166 jsc#PED-1168 jsc#PED-1170 jsc#PED-1218 jsc#PED-1220 jsc#PED-1222 jsc#PED-1223 jsc#PED-1225
The LS1028A SoC errata sheet mentions A-050121 "GPU hangs if clock
gating for Rasterizer, Setup Engine and Texture Engine are enabled".
The workaround is to disable the corresponding clock gatings.
Signed-off-by: Michael Walle <michael@walle.cc>
Signed-off-by: Lucas Stach <l.stach@pengutronix.de>
Acked-by: Patrik Jakobsson <pjakobsson@suse.de>
---
drivers/gpu/drm/etnaviv/etnaviv_gpu.c | 6 ++++++
1 file changed, 6 insertions(+)
diff --git a/drivers/gpu/drm/etnaviv/etnaviv_gpu.c b/drivers/gpu/drm/etnaviv/etnaviv_gpu.c
index 4102bcea3341..c297fffe06eb 100644
--- a/drivers/gpu/drm/etnaviv/etnaviv_gpu.c
+++ b/drivers/gpu/drm/etnaviv/etnaviv_gpu.c
@@ -613,6 +613,12 @@ static void etnaviv_gpu_enable_mlcg(struct etnaviv_gpu *gpu)
etnaviv_is_model_rev(gpu, GC2000, 0x5108))
pmc |= VIVS_PM_MODULE_CONTROLS_DISABLE_MODULE_CLOCK_GATING_TX;
+ /* Disable SE, RA and TX clock gating on affected core revisions. */
+ if (etnaviv_is_model_rev(gpu, GC7000, 0x6202))
+ pmc |= VIVS_PM_MODULE_CONTROLS_DISABLE_MODULE_CLOCK_GATING_SE |
+ VIVS_PM_MODULE_CONTROLS_DISABLE_MODULE_CLOCK_GATING_RA |
+ VIVS_PM_MODULE_CONTROLS_DISABLE_MODULE_CLOCK_GATING_TX;
+
pmc |= VIVS_PM_MODULE_CONTROLS_DISABLE_MODULE_CLOCK_GATING_RA_HZ;
pmc |= VIVS_PM_MODULE_CONTROLS_DISABLE_MODULE_CLOCK_GATING_RA_EZ;
--
2.38.1