linux-kernel - [PATCH 2/5] drm/panfrost: add support specifying pgtbl quirks

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Date:   Tue,  8 Sep 2020 17:18:50 +0200
From:   Neil Armstrong <narmstrong@...libre.com>
To:     robh@...nel.org, tomeu.vizoso@...labora.com, steven.price@....com,
        alyssa.rosenzweig@...labora.com
Cc:     dri-devel@...ts.freedesktop.org,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        linux-amlogic@...ts.infradead.org,
        Neil Armstrong <narmstrong@...libre.com>
Subject: [PATCH 2/5] drm/panfrost: add support specifying pgtbl quirks

Add a pgtbl_quirks entry in the compatible specific table to permit specyfying IOMMU
quirks for platforms.

Signed-off-by: Neil Armstrong <narmstrong@...libre.com>
---
 drivers/gpu/drm/panfrost/panfrost_device.h | 3 +++
 drivers/gpu/drm/panfrost/panfrost_mmu.c    | 1 +
 2 files changed, 4 insertions(+)

diff --git a/drivers/gpu/drm/panfrost/panfrost_device.h b/drivers/gpu/drm/panfrost/panfrost_device.h
index 953f7536a773..2cf1a6a13af8 100644
--- a/drivers/gpu/drm/panfrost/panfrost_device.h
+++ b/drivers/gpu/drm/panfrost/panfrost_device.h
@@ -70,6 +70,9 @@ struct panfrost_compatible {
 	int num_pm_domains;
 	/* Only required if num_pm_domains > 1. */
 	const char * const *pm_domain_names;
+
+	/* IOMMU quirks flags */
+	unsigned long pgtbl_quirks;
 };
 
 struct panfrost_device {
diff --git a/drivers/gpu/drm/panfrost/panfrost_mmu.c b/drivers/gpu/drm/panfrost/panfrost_mmu.c
index e8f7b11352d2..55a846c70e46 100644
--- a/drivers/gpu/drm/panfrost/panfrost_mmu.c
+++ b/drivers/gpu/drm/panfrost/panfrost_mmu.c
@@ -368,6 +368,7 @@ int panfrost_mmu_pgtable_alloc(struct panfrost_file_priv *priv)
 	mmu->as = -1;
 
 	mmu->pgtbl_cfg = (struct io_pgtable_cfg) {
+		.quirks = pfdev->comp ? pfdev->comp->pgtbl_quirks : 0,
 		.pgsize_bitmap	= SZ_4K | SZ_2M,
 		.ias		= FIELD_GET(0xff, pfdev->features.mmu_features),
 		.oas		= FIELD_GET(0xff00, pfdev->features.mmu_features),
-- 
2.22.0