linux-kernel - [PATCH v2 3/3] drm/etnaviv: Disable SH

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Message-Id: <20240125-etnaviv-npu-v2-3-ba23c9a32be1@pengutronix.de>
Date: Thu, 25 Jan 2024 12:07:08 +0100
From: Philipp Zabel <p.zabel@...gutronix.de>
To: Lucas Stach <l.stach@...gutronix.de>, 
 Russell King <linux+etnaviv@...linux.org.uk>, 
 Christian Gmeiner <christian.gmeiner@...il.com>, 
 David Airlie <airlied@...il.com>, Daniel Vetter <daniel@...ll.ch>
Cc: etnaviv@...ts.freedesktop.org, dri-devel@...ts.freedesktop.org, 
 linux-kernel@...r.kernel.org, Philipp Zabel <p.zabel@...gutronix.de>
Subject: [PATCH v2 3/3] drm/etnaviv: Disable SH_EU clock gating on
 VIPNano-Si+

Disable SH_EU clock gating for the VIPNano-Si+ NPU on i.MX8MP
and for other affected core revisions.
Taken from linux-imx lf-6.1.36-2.1.0, specifically [1].

[1] https://github.com/nxp-imx/linux-imx/blob/lf-6.1.36-2.1.0/drivers/mxc/gpu-viv/hal/kernel/arch/gc_hal_kernel_hardware.c#L2747-L2761

Signed-off-by: Philipp Zabel <p.zabel@...gutronix.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 c61d50dd3829..c669419b3ae3 100644
--- a/drivers/gpu/drm/etnaviv/etnaviv_gpu.c
+++ b/drivers/gpu/drm/etnaviv/etnaviv_gpu.c
@@ -643,6 +643,12 @@ static void etnaviv_gpu_enable_mlcg(struct etnaviv_gpu *gpu)
 		pmc |= VIVS_PM_MODULE_CONTROLS_DISABLE_MODULE_CLOCK_GATING_SE |
 		       VIVS_PM_MODULE_CONTROLS_DISABLE_MODULE_CLOCK_GATING_RA;
 
+	/* Disable SH_EU clock gating on affected core revisions. */
+	if (etnaviv_is_model_rev(gpu, 0x8000, 0x7200) ||
+	    etnaviv_is_model_rev(gpu, 0x8000, 0x8002) ||
+	    etnaviv_is_model_rev(gpu, 0x9200, 0x6304))
+		pmc |= VIVS_PM_MODULE_CONTROLS_DISABLE_MODULE_CLOCK_GATING_SH_EU;
+
 	pmc |= VIVS_PM_MODULE_CONTROLS_DISABLE_MODULE_CLOCK_GATING_RA_HZ;
 	pmc |= VIVS_PM_MODULE_CONTROLS_DISABLE_MODULE_CLOCK_GATING_RA_EZ;
 

-- 
2.39.2