1. Patchew
  2. linux
  3. View series

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

zhangzhijie posted 1 patch 1 week ago
There is a newer version of this series
drivers/gpu/drm/i915/display/intel_vga.c | 27 ++++++++++++++++++------
1 file changed, 20 insertions(+), 7 deletions(-)
[PATCH v2] i915: Support Intel GPU porting on any non-x86 system.
Posted by zhangzhijie 1 week ago 
inb/outb speccial wire not support on other ARCH.
Should detect whether arch platform support or not.

Signed-off-by: zhangzhijie <zhangzhijie@bosc.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)
+{
+#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)
 {
@@ -66,11 +75,13 @@ void intel_vga_disable(struct intel_display *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);
+	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
Re: [PATCH v2] i915: Support Intel GPU porting on any non-x86 system.
Posted by Ville Syrjälä 1 week ago 
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@bosc.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"?

> +{
> +#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?

> +}
> +
>  /* 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?

> -	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

-- 
Ville Syrjälä
Intel
Re: [PATCH v2] i915: Support Intel GPU porting on any non-x86 system.
Posted by ZhangZhiJie 6 days, 21 hours ago 

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@bosc.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
>

Patchew 2.1-devel-b67e4c2

© 2016 - 2025 Red Hat, Inc.