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

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Message-ID: <16876d5f-311e-4c06-ad8a-e05b4a240aba@bosc.ac.cn>
Date: Tue, 25 Nov 2025 11:31:04 +0800
From: ZhangZhiJie <zhangzhijie@...c.ac.cn>
To: Ville Syrjälä <ville.syrjala@...ux.intel.com>
Cc: 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
Subject: Re: [PATCH v2] i915: Support Intel GPU porting on any non-x86 system.



On 2025/11/25 05:05, Ville Syrjälä wrote:
> On Mon, Nov 24, 2025 at 02:56:12PM +0800, zhangzhijie 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 | 27 ++++++++++++++++++------
>>   1 file changed, 20 insertions(+), 7 deletions(-)
>>
>> diff --git a/drivers/gpu/drm/i915/display/intel_vga.c b/drivers/gpu/drm/i915/display/intel_vga.c
>> index 6e125564db34..d5d6c4ba6434 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)
> 
> whatis "pm"?
I'd wana to power-manage . or can using better function name
> 
>> +{
>> +#if defined(CONFIG_X86) || defined(CONFIG_X86_64)
>> +	return true;
>> +#else
>> +	return false;
>> +#endif
> 
> Isn't there already some kind of ARCH_HAS_PORTIO thing?
> Does that not work?
> 
configs had HAS_IOPORT, But non-x86 arch not support  ioport for  VGA_SEQ_*
>> +}
>> +
>>   /* Disable the VGA plane that we never use */
>>   void intel_vga_disable(struct intel_display *display)
>>   {
>> @@ -66,11 +75,13 @@ void intel_vga_disable(struct intel_display *display)
>>   
> 
> I wouldn't expect us to get this far. The VGA plane should
> never have been enabled in the first place.
> 
>>   	/* WaEnableVGAAccessThroughIOPort:ctg,elk,ilk,snb,ivb,vlv,hsw */
>>   	vga_get_uninterruptible(pdev, VGA_RSRC_LEGACY_IO);
> 
> Why are you leaving the vga_get() outside the check?
> 
Sorry forgot , I will take new patch for fix this misstake
>> -	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))) {
>> +		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);
>> @@ -91,8 +102,10 @@ void intel_vga_reset_io_mem(struct intel_display *display)
>>   	 * 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))) {
>> +		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
>