From: Han Gao <gaohan@iscas.ac.cn>
To: "Alex Deucher" <alexander.deucher@amd.com>,
"Christian König" <christian.koenig@amd.com>,
"David Airlie" <airlied@gmail.com>,
"Simona Vetter" <simona@ffwll.ch>,
amd-gfx@lists.freedesktop.org, dri-devel@lists.freedesktop.org,
linux-kernel@vger.kernel.org
Cc: Han Gao <rabenda.cn@gmail.com>,
linux-riscv@lists.infradead.org, sophgo@lists.linux.dev,
Han Gao <gaohan@iscas.ac.cn>
Subject: [PATCH] drm/radeon: bypass no_64bit_msi with new msi64 parameter
Date: Sun, 21 Dec 2025 00:33:38 +0800 [thread overview]
Message-ID: <20251220163338.3852399-1-gaohan@iscas.ac.cn> (raw)
Sophgo SG2042's MSI driver lacks 32-bit MSI support.
Added a msi64 parameter to skip the limitation and force 64-bit MSI.
Signed-off-by: Han Gao <gaohan@iscas.ac.cn>
---
drivers/gpu/drm/radeon/radeon.h | 1 +
drivers/gpu/drm/radeon/radeon_drv.c | 4 ++++
drivers/gpu/drm/radeon/radeon_irq_kms.c | 2 +-
3 files changed, 6 insertions(+), 1 deletion(-)
diff --git a/drivers/gpu/drm/radeon/radeon.h b/drivers/gpu/drm/radeon/radeon.h
index 527b9d19d730..7207e3156c28 100644
--- a/drivers/gpu/drm/radeon/radeon.h
+++ b/drivers/gpu/drm/radeon/radeon.h
@@ -122,6 +122,7 @@ extern int radeon_uvd;
extern int radeon_vce;
extern int radeon_si_support;
extern int radeon_cik_support;
+extern int radeon_msi64;
/*
* Copy from radeon_drv.h so we don't have to include both and have conflicting
diff --git a/drivers/gpu/drm/radeon/radeon_drv.c b/drivers/gpu/drm/radeon/radeon_drv.c
index 87fd6255c114..53af28494c03 100644
--- a/drivers/gpu/drm/radeon/radeon_drv.c
+++ b/drivers/gpu/drm/radeon/radeon_drv.c
@@ -249,6 +249,10 @@ int radeon_cik_support = -1;
MODULE_PARM_DESC(cik_support, "CIK support (1 = enabled, 0 = disabled, -1 = default)");
module_param_named(cik_support, radeon_cik_support, int, 0444);
+int radeon_msi64;
+MODULE_PARM_DESC(msi64, "MSI64 support (1 = enabled, 0 = disabled)");
+module_param_named(msi64, radeon_msi64, int, 0444);
+
static const struct pci_device_id pciidlist[] = {
radeon_PCI_IDS
};
diff --git a/drivers/gpu/drm/radeon/radeon_irq_kms.c b/drivers/gpu/drm/radeon/radeon_irq_kms.c
index 9961251b44ba..62eb5a6968ff 100644
--- a/drivers/gpu/drm/radeon/radeon_irq_kms.c
+++ b/drivers/gpu/drm/radeon/radeon_irq_kms.c
@@ -250,7 +250,7 @@ static bool radeon_msi_ok(struct radeon_device *rdev)
* of address for "64-bit" MSIs which breaks on some platforms, notably
* IBM POWER servers, so we limit them
*/
- if (rdev->family < CHIP_BONAIRE) {
+ if (rdev->family < CHIP_BONAIRE && !radeon_msi64) {
dev_info(rdev->dev, "radeon: MSI limited to 32-bit\n");
rdev->pdev->no_64bit_msi = 1;
}
--
2.47.3
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next reply other threads:[~2025-12-20 16:34 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2025-12-20 16:33 Han Gao [this message]
2025-12-22 21:32 ` [PATCH] drm/radeon: bypass no_64bit_msi with new msi64 parameter Arnd Bergmann
2025-12-23 14:55 ` Christian König
2025-12-23 15:31 ` Vivian Wang
2026-01-06 15:34 ` Christian König
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