linux-kernel - [PATCH] drm/radeon: bypass no_64bit

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Message-ID: <20251220163338.3852399-1-gaohan@iscas.ac.cn>
Date: Sun, 21 Dec 2025 00:33:38 +0800
From: Han Gao <gaohan@...as.ac.cn>
To: Alex Deucher <alexander.deucher@....com>,
	Christian König <christian.koenig@....com>,
	David Airlie <airlied@...il.com>,
	Simona Vetter <simona@...ll.ch>,
	amd-gfx@...ts.freedesktop.org,
	dri-devel@...ts.freedesktop.org,
	linux-kernel@...r.kernel.org
Cc: Han Gao <rabenda.cn@...il.com>,
	linux-riscv@...ts.infradead.org,
	sophgo@...ts.linux.dev,
	Han Gao <gaohan@...as.ac.cn>
Subject: [PATCH] drm/radeon: bypass no_64bit_msi with new msi64 parameter

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@...as.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