linux-kernel - [PATCH v3 8/9] drm/ast: Register as a vga client to vgaarb by calling vga_client

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Date:   Wed, 12 Jul 2023 00:43:09 +0800
From:   Sui Jingfeng <sui.jingfeng@...ux.dev>
To:     David Airlie <airlied@...il.com>
Cc:     amd-gfx@...ts.freedesktop.org, dri-devel@...ts.freedesktop.org,
        linux-kernel@...r.kernel.org, intel-gfx@...ts.freedesktop.org,
        kvm@...r.kernel.org, linux-fbdev@...r.kernel.org,
        Sui Jingfeng <suijingfeng@...ngson.cn>,
        Thomas Zimmermann <tzimmermann@...e.de>,
        Jocelyn Falempe <jfalempe@...hat.com>,
        Daniel Vetter <daniel@...ll.ch>
Subject: [PATCH v3 8/9] drm/ast: Register as a vga client to vgaarb by calling vga_client_register()

From: Sui Jingfeng <suijingfeng@...ngson.cn>

Becasuse the VGA Display Controller in the ASpeed BMC chip is also a PCIe
device, the Software Programming guide of AST2400 say that it is Fully
IBM VGA compliant, thus, it should also particiate in the arbitration.

Cc: Thomas Zimmermann <tzimmermann@...e.de>
Cc: Jocelyn Falempe <jfalempe@...hat.com>
Cc: David Airlie <airlied@...il.com>
Cc: Daniel Vetter <daniel@...ll.ch>
Signed-off-by: Sui Jingfeng <suijingfeng@...ngson.cn>
---
 drivers/gpu/drm/ast/ast_drv.c | 29 +++++++++++++++++++++++++++++
 1 file changed, 29 insertions(+)

diff --git a/drivers/gpu/drm/ast/ast_drv.c b/drivers/gpu/drm/ast/ast_drv.c
index e1224ef4ad83..0e53b0cd3f09 100644
--- a/drivers/gpu/drm/ast/ast_drv.c
+++ b/drivers/gpu/drm/ast/ast_drv.c
@@ -28,6 +28,7 @@
 
 #include <linux/module.h>
 #include <linux/pci.h>
+#include <linux/vgaarb.h>
 
 #include <drm/drm_aperture.h>
 #include <drm/drm_atomic_helper.h>
@@ -89,6 +90,32 @@ static const struct pci_device_id ast_pciidlist[] = {
 
 MODULE_DEVICE_TABLE(pci, ast_pciidlist);
 
+static bool ast_vga_is_primary_gpu(struct pci_dev *pdev)
+{
+	struct drm_device *drm = pci_get_drvdata(pdev);
+	struct ast_device *ast = to_ast_device(drm);
+
+	return drm_aperture_contain_firmware_fb(ast->vram_base, ast->vram_size);
+}
+
+static unsigned int ast_vga_set_decode(struct pci_dev *pdev, bool state)
+{
+	struct drm_device *drm = pci_get_drvdata(pdev);
+	struct ast_device *ast = to_ast_device(drm);
+
+	if (state) {
+		/* Enable standard VGA decode and Enable normal VGA decode */
+		ast_set_index_reg(ast, AST_IO_CRTC_PORT, 0xa1, 0x04);
+
+		return VGA_RSRC_LEGACY_IO | VGA_RSRC_LEGACY_MEM |
+		       VGA_RSRC_NORMAL_IO | VGA_RSRC_NORMAL_MEM;
+	}
+
+	ast_set_index_reg(ast, AST_IO_CRTC_PORT, 0xa1, 0x07);
+
+	return VGA_RSRC_NORMAL_IO | VGA_RSRC_NORMAL_MEM;
+}
+
 static int ast_pci_probe(struct pci_dev *pdev, const struct pci_device_id *ent)
 {
 	struct ast_device *ast;
@@ -112,6 +139,8 @@ static int ast_pci_probe(struct pci_dev *pdev, const struct pci_device_id *ent)
 	if (ret)
 		return ret;
 
+	vga_client_register(pdev, ast_vga_set_decode, ast_vga_is_primary_gpu);
+
 	drm_fbdev_generic_setup(dev, 32);
 
 	return 0;
-- 
2.25.1