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

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Message-ID: <889561a0-cf44-4a17-a7c2-095408006bf3@bosc.ac.cn>
Date: Thu, 30 Oct 2025 11:28:06 +0800
From: ZhangZhiJie <zhangzhijie@...c.ac.cn>
To: Jeff Geerling <jeff@...fgeerling.com>
Cc: wangran@...c.ac.cn, zhangjian@...c.ac.cn, daniel@...ll.ch,
 jani.nikula@...ux.intel.com, 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 2025/10/30 09:55, Jeff Geerling wrote:
> +1 for this patch, as it would enable Xe on any non-x86 system.
> 
> I've successfully tested this change on Ampere and Broadcom (Raspberry Pi) systems.
> 
> We've been using the flag `CONFIG_VGA_CONSOLE` instead of `CONFIG_X86` but either should achieve the same goal. See: https://github.com/6by9/linux/commit/6bd4cfe79b5111986dd11a5c6e48d4a963fd7740
> 
> With some OSes a later Mesa version needs to be compiled to support newer Xe/Xe2 cards, however I've successfully tested a number of Intel dGPUs at this point. Sometimes setting force probe to '*' (or the particular GPU ID) is required, but otherwise stability is good.
> 
> For example, the A750: https://github.com/geerlingguy/raspberry-pi-pcie-devices/issues/510#issuecomment-3383284831
> 
>> On Jul 15, 2025, at 1:18 AM, 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
>>
>> 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
>> }
>>
>> int intel_vga_register(struct drm_i915_private *i915)
>> -- 
>> 2.34.1
>>
>>
Congratulation! . So I think shoule be disable this ops or take other 
ways to instead this code， Like None IO soc/ARCH