linux-kernel - [PATCH v3] i915: Support Intel GPU porting on any non-x86 system.

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Message-Id: <20251125093651.2414999-1-zhangzhijie@bosc.ac.cn>
Date: Tue, 25 Nov 2025 17:36:51 +0800
From: zhangzhijie <zhangzhijie@...c.ac.cn>
To: jani.nikula@...ux.intel.com,
	jeff@...fgeerling.com,
	zhangzhijie@...c.ac.cn,
	wangran@...c.ac.cn,
	zhangjian@...c.ac.cn,
	daniel@...ll.ch,
	rodrigo.vivi@...el.com,
	joonas.lahtinen@...ux.intel.com,
	tursulin@...ulin.net,
	airlied@...il.com,
	intel-gfx@...ts.freedesktop.org,
	intel-xe@...ts.freedesktop.org,
	dri-devel@...ts.freedesktop.org,
	linux-kernel@...r.kernel.org,
	guoyaxing@...c.ac.cn,
	ville.syrjala@...ux.intel.com
Subject: [PATCH v3] i915: Support Intel GPU porting on any non-x86 system.

inb/outb VGA_SEQ_* not support on other ARCH (such as RISCV).
Should detect whether arch platform support or not.

Signed-off-by: zhangzhijie <zhangzhijie@...c.ac.cn>

Changes in v3:
    1.Rewrite Commit message.
    2. Remove likely/unlikely

Changes in v2:
	1. vga_get/put inside the branch.

Signed-off-by: zhangzhijie <zhangzhijie@...c.ac.cn>
---
 drivers/gpu/drm/i915/display/intel_vga.c | 33 +++++++++++++++++-------
 1 file changed, 23 insertions(+), 10 deletions(-)

diff --git a/drivers/gpu/drm/i915/display/intel_vga.c b/drivers/gpu/drm/i915/display/intel_vga.c
index 6e125564db34..fda4c2cfd7cf 100644
--- a/drivers/gpu/drm/i915/display/intel_vga.c
+++ b/drivers/gpu/drm/i915/display/intel_vga.c
@@ -41,6 +41,15 @@ static bool has_vga_pipe_sel(struct intel_display *display)
 	return DISPLAY_VER(display) < 7;
 }
 
+static bool intel_arch_support_vga_pm(struct intel_display *display)
+{
+#if defined(CONFIG_X86) || defined(CONFIG_X86_64)
+	return true;
+#else
+	return false;
+#endif
+}
+
 /* Disable the VGA plane that we never use */
 void intel_vga_disable(struct intel_display *display)
 {
@@ -64,13 +73,15 @@ void intel_vga_disable(struct intel_display *display)
 	drm_dbg_kms(display->drm, "Disabling VGA plane on pipe %c\n",
 		    pipe_name(pipe));
 
-	/* WaEnableVGAAccessThroughIOPort:ctg,elk,ilk,snb,ivb,vlv,hsw */
-	vga_get_uninterruptible(pdev, VGA_RSRC_LEGACY_IO);
-	outb(0x01, VGA_SEQ_I);
-	sr1 = inb(VGA_SEQ_D);
-	outb(sr1 | VGA_SR01_SCREEN_OFF, VGA_SEQ_D);
-	vga_put(pdev, VGA_RSRC_LEGACY_IO);
-	udelay(300);
+	if (intel_arch_support_vga_pm(display)) {
+		/* WaEnableVGAAccessThroughIOPort:ctg,elk,ilk,snb,ivb,vlv,hsw */
+		vga_get_uninterruptible(pdev, VGA_RSRC_LEGACY_IO);
+		outb(0x01, VGA_SEQ_I);
+		sr1 = inb(VGA_SEQ_D);
+		outb(sr1 | VGA_SR01_SCREEN_OFF, VGA_SEQ_D);
+		vga_put(pdev, VGA_RSRC_LEGACY_IO);
+		udelay(300);
+	}
 
 	intel_de_write(display, vga_reg, VGA_DISP_DISABLE);
 	intel_de_posting_read(display, vga_reg);
@@ -90,9 +101,11 @@ void intel_vga_reset_io_mem(struct intel_display *display)
 	 * sure vgacon can keep working normally without triggering interrupts
 	 * and error messages.
 	 */
-	vga_get_uninterruptible(pdev, VGA_RSRC_LEGACY_IO);
-	outb(inb(VGA_MIS_R), VGA_MIS_W);
-	vga_put(pdev, VGA_RSRC_LEGACY_IO);
+	if (intel_arch_support_vga_pm(display)) {
+		vga_get_uninterruptible(pdev, VGA_RSRC_LEGACY_IO);
+		outb(inb(VGA_MIS_R), VGA_MIS_W);
+		vga_put(pdev, VGA_RSRC_LEGACY_IO);
+	}
 }
 
 int intel_vga_register(struct intel_display *display)
-- 
2.34.1