From 11bb0a2343ecf6a1dd58485cb24fb09ebb638ca9 Mon Sep 17 00:00:00 2001
From: Alyssa Rosenzweig <alyssa.rosenzweig@collabora.com>
Date: Fri, 11 Feb 2022 09:58:49 -0500
Subject: drm/panfrost: Handle IDVS_GROUP_SIZE feature
Git-commit: 2e87309e0660fed736ca5823b714c1d958941c4d
Patch-mainline: v5.18-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 IDVS group size feature was missing. It is used on some Bifrost and
Valhall GPUs, and is the last kernel-relevant Bifrost feature we're
missing.
This feature adds an extra IDVS group size field to the JM_CONFIG
register. In kbase, the value is configurable via the device tree; kbase
uses 0xF as a default if no value is specified. Until we find a device
demanding otherwise, let's always set the 0xF default on devices which
support this feature mimicking kbase's behaviour.
Tuning this register slightly improves performance of index-driven
vertex shading. On Mali-G52 (with Mesa), overall glmark2 score is
improved from 1026 to 1037. Geometry-heavy scenes like -bshading are
improved from 1068 to 1098.
Signed-off-by: Alyssa Rosenzweig <alyssa.rosenzweig@collabora.com>
Reviewed-by: Steven Price <steven.price@arm.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20220211145849.3148-1-alyssa.rosenzweig@collabora.com
Acked-by: Patrik Jakobsson <pjakobsson@suse.de>
---
drivers/gpu/drm/panfrost/panfrost_features.h | 3 +++
drivers/gpu/drm/panfrost/panfrost_gpu.c | 3 +++
drivers/gpu/drm/panfrost/panfrost_regs.h | 1 +
3 files changed, 7 insertions(+)
diff --git a/drivers/gpu/drm/panfrost/panfrost_features.h b/drivers/gpu/drm/panfrost/panfrost_features.h
index 34f2bae1ec8c..36fadcf9634e 100644
--- a/drivers/gpu/drm/panfrost/panfrost_features.h
+++ b/drivers/gpu/drm/panfrost/panfrost_features.h
@@ -20,6 +20,7 @@ enum panfrost_hw_feature {
HW_FEATURE_AARCH64_MMU,
HW_FEATURE_TLS_HASHING,
HW_FEATURE_THREAD_GROUP_SPLIT,
+ HW_FEATURE_IDVS_GROUP_SIZE,
HW_FEATURE_3BIT_EXT_RW_L2_MMU_CONFIG,
};
@@ -74,6 +75,7 @@ enum panfrost_hw_feature {
BIT_ULL(HW_FEATURE_FLUSH_REDUCTION) | \
BIT_ULL(HW_FEATURE_PROTECTED_MODE) | \
BIT_ULL(HW_FEATURE_PROTECTED_DEBUG_MODE) | \
+ BIT_ULL(HW_FEATURE_IDVS_GROUP_SIZE) | \
BIT_ULL(HW_FEATURE_COHERENCY_REG))
#define hw_features_g76 (\
@@ -87,6 +89,7 @@ enum panfrost_hw_feature {
BIT_ULL(HW_FEATURE_COHERENCY_REG) | \
BIT_ULL(HW_FEATURE_AARCH64_MMU) | \
BIT_ULL(HW_FEATURE_TLS_HASHING) | \
+ BIT_ULL(HW_FEATURE_IDVS_GROUP_SIZE) | \
BIT_ULL(HW_FEATURE_3BIT_EXT_RW_L2_MMU_CONFIG))
#define hw_features_g31 (\
diff --git a/drivers/gpu/drm/panfrost/panfrost_gpu.c b/drivers/gpu/drm/panfrost/panfrost_gpu.c
index 15cec831a99a..aa89926742fd 100644
--- a/drivers/gpu/drm/panfrost/panfrost_gpu.c
+++ b/drivers/gpu/drm/panfrost/panfrost_gpu.c
@@ -145,6 +145,9 @@ static void panfrost_gpu_init_quirks(struct panfrost_device *pfdev)
quirks |= (COHERENCY_ACE_LITE | COHERENCY_ACE) <<
JM_FORCE_COHERENCY_FEATURES_SHIFT;
+ if (panfrost_has_hw_feature(pfdev, HW_FEATURE_IDVS_GROUP_SIZE))
+ quirks |= JM_DEFAULT_IDVS_GROUP_SIZE << JM_IDVS_GROUP_SIZE_SHIFT;
+
if (quirks)
gpu_write(pfdev, GPU_JM_CONFIG, quirks);
diff --git a/drivers/gpu/drm/panfrost/panfrost_regs.h b/drivers/gpu/drm/panfrost/panfrost_regs.h
index 6c5a11ef1ee8..16e776cc82ea 100644
--- a/drivers/gpu/drm/panfrost/panfrost_regs.h
+++ b/drivers/gpu/drm/panfrost/panfrost_regs.h
@@ -208,6 +208,7 @@
#define JM_MAX_JOB_THROTTLE_LIMIT 0x3F
#define JM_FORCE_COHERENCY_FEATURES_SHIFT 2
#define JM_IDVS_GROUP_SIZE_SHIFT 16
+#define JM_DEFAULT_IDVS_GROUP_SIZE 0xF
#define JM_MAX_IDVS_GROUP_SIZE 0x3F
--
2.38.1