* [PATCH] drm/i915: apply WaEnableVGAAccessThroughIOPort as needed
@ 2021-06-04 15:49 Emil Velikov
2021-06-09 9:18 ` Emil Velikov
2021-06-10 15:01 ` Ville Syrjälä
0 siblings, 2 replies; 3+ messages in thread
From: Emil Velikov @ 2021-06-04 15:49 UTC (permalink / raw)
To: Jani Nikula, Joonas Lahtinen, Rodrigo Vivi; +Cc: intel-gfx, kernel, dri-devel
From: Emil Velikov <emil.velikov@collabora.com>
Currently as the workaround is applied the screen flickers. As a result
we do not achieve seamless boot experience.
Avoiding the issue in the common use-case might be hard, although we can
resolve it for dual GPU setups - when the "other" GPU is primary and/or
outputs are connected to it.
With this I was able to get seamless experience on my Intel/Nvidia box,
running systemd-boot and sddm/Xorg. Note that the i915 driver is within
initrd while the Nvidia one is not.
Without this patch, the splash presented by systemd-boot (UEFI BGRT) is
torn down as the code-path kicks in, leaving the monitor blank until the
login manager starts.
Same issue were reported with plymouth/grub, although personally I
wasn't able to get them to behave on my setup.
Suggested-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Signed-off-by: Emil Velikov <emil.velikov@collabora.com>
---
Supersedes
https://lore.kernel.org/dri-devel/20210516171432.1734268-1-emil.l.velikov@gmail.com/
Ville, others,
Patch is based against drm-intel/drm-intel-next and will apply cleanly
against drm-intel/drm-intel-fixes.
If possible, can one of the i915 maintainers apply it to the latter?
Thanks
Emil
---
drivers/gpu/drm/i915/display/intel_vga.c | 3 +++
1 file changed, 3 insertions(+)
diff --git a/drivers/gpu/drm/i915/display/intel_vga.c b/drivers/gpu/drm/i915/display/intel_vga.c
index be333699c515..7beef1206097 100644
--- a/drivers/gpu/drm/i915/display/intel_vga.c
+++ b/drivers/gpu/drm/i915/display/intel_vga.c
@@ -29,6 +29,9 @@ void intel_vga_disable(struct drm_i915_private *dev_priv)
i915_reg_t vga_reg = intel_vga_cntrl_reg(dev_priv);
u8 sr1;
+ if (intel_de_read(dev_priv, vga_reg) & VGA_DISP_DISABLE)
+ return;
+
/* WaEnableVGAAccessThroughIOPort:ctg,elk,ilk,snb,ivb,vlv,hsw */
vga_get_uninterruptible(pdev, VGA_RSRC_LEGACY_IO);
outb(SR01, VGA_SR_INDEX);
--
2.31.1
^ permalink raw reply related [flat|nested] 3+ messages in thread
* Re: [PATCH] drm/i915: apply WaEnableVGAAccessThroughIOPort as needed
2021-06-04 15:49 [PATCH] drm/i915: apply WaEnableVGAAccessThroughIOPort as needed Emil Velikov
@ 2021-06-09 9:18 ` Emil Velikov
2021-06-10 15:01 ` Ville Syrjälä
1 sibling, 0 replies; 3+ messages in thread
From: Emil Velikov @ 2021-06-09 9:18 UTC (permalink / raw)
To: Jani Nikula, Joonas Lahtinen, Rodrigo Vivi
Cc: Intel Graphics Development, kernel, ML dri-devel
On Fri, 4 Jun 2021 at 16:49, Emil Velikov <emil.l.velikov@gmail.com> wrote:
>
> From: Emil Velikov <emil.velikov@collabora.com>
>
> Currently as the workaround is applied the screen flickers. As a result
> we do not achieve seamless boot experience.
>
> Avoiding the issue in the common use-case might be hard, although we can
> resolve it for dual GPU setups - when the "other" GPU is primary and/or
> outputs are connected to it.
>
> With this I was able to get seamless experience on my Intel/Nvidia box,
> running systemd-boot and sddm/Xorg. Note that the i915 driver is within
> initrd while the Nvidia one is not.
>
> Without this patch, the splash presented by systemd-boot (UEFI BGRT) is
> torn down as the code-path kicks in, leaving the monitor blank until the
> login manager starts.
>
> Same issue were reported with plymouth/grub, although personally I
> wasn't able to get them to behave on my setup.
>
> Suggested-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
> Signed-off-by: Emil Velikov <emil.velikov@collabora.com>
> ---
>
> Supersedes
> https://lore.kernel.org/dri-devel/20210516171432.1734268-1-emil.l.velikov@gmail.com/
>
> Ville, others,
>
> Patch is based against drm-intel/drm-intel-next and will apply cleanly
> against drm-intel/drm-intel-fixes.
>
> If possible, can one of the i915 maintainers apply it to the latter?
>
> Thanks
> Emil
> ---
> drivers/gpu/drm/i915/display/intel_vga.c | 3 +++
> 1 file changed, 3 insertions(+)
>
> diff --git a/drivers/gpu/drm/i915/display/intel_vga.c b/drivers/gpu/drm/i915/display/intel_vga.c
> index be333699c515..7beef1206097 100644
> --- a/drivers/gpu/drm/i915/display/intel_vga.c
> +++ b/drivers/gpu/drm/i915/display/intel_vga.c
> @@ -29,6 +29,9 @@ void intel_vga_disable(struct drm_i915_private *dev_priv)
> i915_reg_t vga_reg = intel_vga_cntrl_reg(dev_priv);
> u8 sr1;
>
> + if (intel_de_read(dev_priv, vga_reg) & VGA_DISP_DISABLE)
> + return;
> +
> /* WaEnableVGAAccessThroughIOPort:ctg,elk,ilk,snb,ivb,vlv,hsw */
> vga_get_uninterruptible(pdev, VGA_RSRC_LEGACY_IO);
> outb(SR01, VGA_SR_INDEX);
> --
> 2.31.1
>
Humble poke?
-Emil
^ permalink raw reply [flat|nested] 3+ messages in thread
* Re: [PATCH] drm/i915: apply WaEnableVGAAccessThroughIOPort as needed
2021-06-04 15:49 [PATCH] drm/i915: apply WaEnableVGAAccessThroughIOPort as needed Emil Velikov
2021-06-09 9:18 ` Emil Velikov
@ 2021-06-10 15:01 ` Ville Syrjälä
1 sibling, 0 replies; 3+ messages in thread
From: Ville Syrjälä @ 2021-06-10 15:01 UTC (permalink / raw)
To: Emil Velikov; +Cc: intel-gfx, dri-devel, Rodrigo Vivi, kernel
On Fri, Jun 04, 2021 at 04:49:05PM +0100, Emil Velikov wrote:
> From: Emil Velikov <emil.velikov@collabora.com>
>
> Currently as the workaround is applied the screen flickers. As a result
> we do not achieve seamless boot experience.
>
> Avoiding the issue in the common use-case might be hard, although we can
> resolve it for dual GPU setups - when the "other" GPU is primary and/or
> outputs are connected to it.
>
> With this I was able to get seamless experience on my Intel/Nvidia box,
> running systemd-boot and sddm/Xorg. Note that the i915 driver is within
> initrd while the Nvidia one is not.
>
> Without this patch, the splash presented by systemd-boot (UEFI BGRT) is
> torn down as the code-path kicks in, leaving the monitor blank until the
> login manager starts.
>
> Same issue were reported with plymouth/grub, although personally I
> wasn't able to get them to behave on my setup.
>
> Suggested-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
> Signed-off-by: Emil Velikov <emil.velikov@collabora.com>
> ---
Pushed to drm-intel-next. Thanks.
>
> Supersedes
> https://lore.kernel.org/dri-devel/20210516171432.1734268-1-emil.l.velikov@gmail.com/
>
> Ville, others,
>
> Patch is based against drm-intel/drm-intel-next and will apply cleanly
> against drm-intel/drm-intel-fixes.
>
> If possible, can one of the i915 maintainers apply it to the latter?
>
> Thanks
> Emil
> ---
> drivers/gpu/drm/i915/display/intel_vga.c | 3 +++
> 1 file changed, 3 insertions(+)
>
> diff --git a/drivers/gpu/drm/i915/display/intel_vga.c b/drivers/gpu/drm/i915/display/intel_vga.c
> index be333699c515..7beef1206097 100644
> --- a/drivers/gpu/drm/i915/display/intel_vga.c
> +++ b/drivers/gpu/drm/i915/display/intel_vga.c
> @@ -29,6 +29,9 @@ void intel_vga_disable(struct drm_i915_private *dev_priv)
> i915_reg_t vga_reg = intel_vga_cntrl_reg(dev_priv);
> u8 sr1;
>
> + if (intel_de_read(dev_priv, vga_reg) & VGA_DISP_DISABLE)
> + return;
> +
> /* WaEnableVGAAccessThroughIOPort:ctg,elk,ilk,snb,ivb,vlv,hsw */
> vga_get_uninterruptible(pdev, VGA_RSRC_LEGACY_IO);
> outb(SR01, VGA_SR_INDEX);
> --
> 2.31.1
--
Ville Syrjälä
Intel
^ permalink raw reply [flat|nested] 3+ messages in thread
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2021-06-04 15:49 [PATCH] drm/i915: apply WaEnableVGAAccessThroughIOPort as needed Emil Velikov
2021-06-09 9:18 ` Emil Velikov
2021-06-10 15:01 ` Ville Syrjälä
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