Re: [Intel-gfx] [PATCH 03/21] fbcon: Restore fbcon scrolling acceleration

Helge Deller
2022-02-01T10:18:14Z

On 2/1/22 11:16, Helge Deller wrote:
> On 1/31/22 22:05, Daniel Vetter wrote:
>> This functionally undoes 39aead8373b3 ("fbcon: Disable accelerated
>> scrolling"), but behind the FRAMEBUFFER_CONSOLE_LEGACY_ACCELERATION
>> option.
>
> you have two trivial copy-n-paste errors in this patch which still prevent the
> console acceleration.
>
>> diff --git a/drivers/video/fbdev/core/fbcon.c b/drivers/video/fbdev/core/fbcon.c
>> index 2ff90061c7f3..39dc18a5de86 100644
>> --- a/drivers/video/fbdev/core/fbcon.c
>> +++ b/drivers/video/fbdev/core/fbcon.c
>> @@ -1125,13 +1125,15 @@ static void fbcon_init(struct vc_data *vc, int init)
>>
>> ops->graphics = 0;
>>
>> - /*
>> - * No more hw acceleration for fbcon.
>> - *
>> - * FIXME: Garbage collect all the now dead code after sufficient time
>> - * has passed.
>> - */
>> +#ifdef CONFIG_FRAMEBUFFER_CONSOLE_ROTATION
>
> should be:
> #ifdef CONFIG_FRAMEBUFFER_CONSOLE_LEGACY_ACCELERATION
>
>
>> + if ((info->flags & FBINFO_HWACCEL_COPYAREA) &&
>> + !(info->flags & FBINFO_HWACCEL_DISABLED))
>> + p->scrollmode = SCROLL_MOVE;
>> + else /* default to something safe */
>> + p->scrollmode = SCROLL_REDRAW;
>> +#else
>> p->scrollmode = SCROLL_REDRAW;
>> +#endif
>>
>> /*
>> * ++guenther: console.c:vc_allocate() relies on initializing
>> @@ -1971,15 +1973,49 @@ static void updatescrollmode(struct fbcon_display *p,
>> {
>> struct fbcon_ops *ops = info->fbcon_par;
>> int fh = vc->vc_font.height;
>> + int cap = info->flags;
>> + u16 t = 0;
>> + int ypan = FBCON_SWAP(ops->rotate, info->fix.ypanstep,
>> + info->fix.xpanstep);
>> + int ywrap = FBCON_SWAP(ops->rotate, info->fix.ywrapstep, t);
>> int yres = FBCON_SWAP(ops->rotate, info->var.yres, info->var.xres);
>> int vyres = FBCON_SWAP(ops->rotate, info->var.yres_virtual,
>> info->var.xres_virtual);
>> + int good_pan = (cap & FBINFO_HWACCEL_YPAN) &&
>> + divides(ypan, vc->vc_font.height) && vyres > yres;
>> + int good_wrap = (cap & FBINFO_HWACCEL_YWRAP) &&
>> + divides(ywrap, vc->vc_font.height) &&
>> + divides(vc->vc_font.height, vyres) &&
>> + divides(vc->vc_font.height, yres);
>> + int reading_fast = cap & FBINFO_READS_FAST;
>> + int fast_copyarea = (cap & FBINFO_HWACCEL_COPYAREA) &&
>> + !(cap & FBINFO_HWACCEL_DISABLED);
>> + int fast_imageblit = (cap & FBINFO_HWACCEL_IMAGEBLIT) &&
>> + !(cap & FBINFO_HWACCEL_DISABLED);
>>
>> p->vrows = vyres/fh;
>> if (yres > (fh * (vc->vc_rows + 1)))
>> p->vrows -= (yres - (fh * vc->vc_rows)) / fh;
>> if ((yres % fh) && (vyres % fh < yres % fh))
>> p->vrows--;
>> +
>> + if (good_wrap || good_pan) {
>> + if (reading_fast || fast_copyarea)
>> + p->scrollmode = good_wrap ?
>> + SCROLL_WRAP_MOVE : SCROLL_PAN_MOVE;
>> + else
>> + p->scrollmode = good_wrap ? SCROLL_REDRAW :
>> + SCROLL_PAN_REDRAW;
>> + } else {
>> + if (reading_fast || (fast_copyarea && !fast_imageblit))
>> + p->scrollmode = SCROLL_MOVE;
>> + else
>> + p->scrollmode = SCROLL_REDRAW;
>> + }
>> +
>> +#ifndef CONFIG_FRAMEBUFFER_CONSOLE_ROTATION
>
> same here... it needs to be:
> #ifdef CONFIG_FRAMEBUFFER_CONSOLE_LEGACY_ACCELERATION

actually:
#ifndef CONFIG_FRAMEBUFFER_CONSOLE_LEGACY_ACCELERATION

>
>
>> + p->scrollmode = SCROLL_REDRAW;
>> +#endif
>> }
>>
>> #define PITCH(w) (((w) + 7) >> 3)
>>
>
> still reviewing the other patches...
>
> Helge
>