linux-kernel - Re: [PATCH v1] Support Intel Xe GPU dirver Porting on RISC-V Architecture

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Message-ID: <08cc7457a13e434832389d63d73f1df804ae1a2c@intel.com>
Date: Thu, 30 Oct 2025 15:34:59 +0200
From: Jani Nikula <jani.nikula@...ux.intel.com>
To: zhangzhijie <zhangzhijie@...c.ac.cn>, 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
Subject: Re: [PATCH v1] Support Intel Xe GPU dirver Porting on RISC-V
 Architecture

On Tue, 15 Jul 2025, zhangzhijie <zhangzhijie@...c.ac.cn> wrote:
>     inb/outb speccial wire not support on other ARCH.
> Should detect whether arch platform support or not.
>
> Signed-off-by: zhangzhijie <zhangzhijie@...c.ac.cn>
> ---
>  drivers/gpu/drm/i915/display/intel_vga.c | 4 ++++
>  1 file changed, 4 insertions(+)
>
> diff --git a/drivers/gpu/drm/i915/display/intel_vga.c b/drivers/gpu/drm/i915/display/intel_vga.c
> index 4b98833bfa8c..5e48e3282670 100644
> --- a/drivers/gpu/drm/i915/display/intel_vga.c
> +++ b/drivers/gpu/drm/i915/display/intel_vga.c
> @@ -33,6 +33,7 @@ void intel_vga_disable(struct drm_i915_private *dev_priv)
>  	if (intel_de_read(dev_priv, vga_reg) & VGA_DISP_DISABLE)
>  		return;
>  
> +#if defined(CONFIG_X86) || defined(CONFIG_X86_64)
>  	/* WaEnableVGAAccessThroughIOPort:ctg,elk,ilk,snb,ivb,vlv,hsw */
>  	vga_get_uninterruptible(pdev, VGA_RSRC_LEGACY_IO);
>  	outb(0x01, VGA_SEQ_I);
> @@ -40,6 +41,7 @@ void intel_vga_disable(struct drm_i915_private *dev_priv)
>  	outb(sr1 | VGA_SR01_SCREEN_OFF, VGA_SEQ_D);
>  	vga_put(pdev, VGA_RSRC_LEGACY_IO);
>  	udelay(300);
> +#endif

This should be abstracted to a separate function with the
#if/#else/#endif choosing a different implementation of the function
(empty stub in the else branch).

>  
>  	intel_de_write(dev_priv, vga_reg, VGA_DISP_DISABLE);
>  	intel_de_posting_read(dev_priv, vga_reg);
> @@ -80,6 +82,7 @@ void intel_vga_redisable(struct drm_i915_private *i915)
>  
>  void intel_vga_reset_io_mem(struct drm_i915_private *i915)
>  {
> +#if defined(CONFIG_X86) || defined(CONFIG_X86_64)
>  	struct pci_dev *pdev = to_pci_dev(i915->drm.dev);
>  
>  	/*
> @@ -95,6 +98,7 @@ void intel_vga_reset_io_mem(struct drm_i915_private *i915)
>  	vga_get_uninterruptible(pdev, VGA_RSRC_LEGACY_IO);
>  	outb(inb(VGA_MIS_R), VGA_MIS_W);
>  	vga_put(pdev, VGA_RSRC_LEGACY_IO);
> +#endif

Ditto, but you have the function already.

>  }
>  
>  int intel_vga_register(struct drm_i915_private *i915)

-- 
Jani Nikula, Intel