linux-kernel - Re: [PATCH v2/2] i915: Support Intel GPU porting on any non-x86 system.

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Message-ID: <9bcca124-e4da-4f68-9ec6-ba76b88d26dc@bosc.ac.cn>
Date: Tue, 25 Nov 2025 16:54:40 +0800
From: ZhangZhiJie <zhangzhijie@...c.ac.cn>
To: Jani Nikula <jani.nikula@...ux.intel.com>, jeff@...fgeerling.com,
 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: Re: [PATCH v2/2] i915: Support Intel GPU porting on any non-x86
 system.


Hi. Jani

On 2025/11/25 16:38, Jani Nikula wrote:
> On Tue, 25 Nov 2025, zhangzhijie <zhangzhijie@...c.ac.cn> wrote:
>> inb/outb speccial wire not support on other ARCH.
>> Should detect whether arch platform support or not.
> 
> I would rather finish the discussion on the previous version before
> seeing a new version.
> 
> You mentioned risc-v in the previous thread, but it needs to be part of
> the commit message too. And I still don't know what "speccial wire" is
> supposed to mean here.
> 
I using RISCV to bootingup A380, This arch not support  VGA_SEQ_* 
ioports. and i don't know if other arch(such as aarch64) has VGA_SEQ_*.
> You still use likely/unlikely, and I told you not to.
> 
Ok, Next patch will fixed.
> There's no patch changelog.
> 
> The version in the subject is "v2/2", but there has already been two
> "v2" posted previously.
> 
After sending emails using V2, I realized that I had used V2 before, so 
I started using V2/2. Can I use V3 to continue with subsequent 
patch-modified commits?
> 
> BR,
> Jani.
> 
> 
>>
>> 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..d85622ba10fc 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 (likely(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 (likely(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)
>