kernels: add linux-libre-aarch64

Some System On a Chip (SOC) have 64bit ARM CPUs that are also
capable of running arm 32bit applications.

Since:
- Parabola doesn't have an aarch64 package repository yet
- The devicetree of devices using such System On a Chip
  are not compiled when using the armv7 defconfig
- Drivers or other platform support code for such hardware
  might also not be compiled in with the armv7 defconfig
- This approach has already been tested with the linux-libre-x86_64
  kenrel

It's then a good idea to add support for such devices by adding
an arrch64 kernel as the maintenance and work is minimal.

The downside is that the external kernel modules that are either
compiled against the kernel or using DKMS will not work by default.

It's however still possible to compile them by hand by using
ARCH= and CROSS_COMPILE= as it is done for this kernel, so it
should be relatively easy to add support for the non-dkms modules.

As for DKMS, someone would need to look into it to understand how
to pass it the make flags (ARCH= and CROSS_COMPILE=) that are
required to automatically build modules.

Signed-off-by: Denis 'GNUtoo' Carikli <GNUtoo@cyberdimension.org>

1 files changed, 57 insertions, 0 deletions

diff --git a/kernels/linux-libre-arm64/0010-drm-i915-Fix-audio-power-up-sequence-for-gen10-displ.patch b/kernels/linux-libre-arm64/0010-drm-i915-Fix-audio-power-up-sequence-for-gen10-displ.patch
new file mode 100644
index 000000000..952bb8d55
--- /dev/null
+++ b/kernels/linux-libre-arm64/0010-drm-i915-Fix-audio-power-up-sequence-for-gen10-displ.patch
@@ -0,0 +1,57 @@
+From 3a8fe5edd1f716667d7f1ebd4f06bc808bf89a6d Mon Sep 17 00:00:00 2001
+From: Kai Vehmanen <kai.vehmanen@linux.intel.com>
+Date: Thu, 3 Oct 2019 11:55:30 +0300
+Subject: [PATCH 10/13] drm/i915: Fix audio power up sequence for gen10+
+ display
+
+On platfroms with gen10+ display, driver must set the enable bit of
+AUDIO_PIN_BUF_CTL register before transactions with the HDA controller
+can proceed. Add setting this bit to the audio power up sequence.
+
+Failing to do this resulted in errors during display audio codec probe,
+and failures during resume from suspend.
+
+Note: We may also need to disable the bit afterwards, but there are
+still unresolved issues with that.
+
+Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=111214
+Signed-off-by: Kai Vehmanen <kai.vehmanen@linux.intel.com>
+Signed-off-by: Jani Nikula <jani.nikula@intel.com>
+Link: https://patchwork.freedesktop.org/patch/msgid/20191003085531.30990-1-kai.vehmanen@linux.intel.com
+---
+ drivers/gpu/drm/i915/display/intel_audio.c | 5 +++++
+ drivers/gpu/drm/i915/i915_reg.h            | 2 ++
+ 2 files changed, 7 insertions(+)
+
+diff --git a/drivers/gpu/drm/i915/display/intel_audio.c b/drivers/gpu/drm/i915/display/intel_audio.c
+index 439bc0a93410..440b33762fef 100644
+--- a/drivers/gpu/drm/i915/display/intel_audio.c
++++ b/drivers/gpu/drm/i915/display/intel_audio.c
+@@ -860,6 +860,11 @@ static unsigned long i915_audio_component_get_power(struct device *kdev)
+ 		/* Force CDCLK to 2*BCLK as long as we need audio powered. */
+ 		if (IS_CANNONLAKE(dev_priv) || IS_GEMINILAKE(dev_priv))
+ 			glk_force_audio_cdclk(dev_priv, true);
++
++		if (INTEL_GEN(dev_priv) >= 10 || IS_GEMINILAKE(dev_priv))
++			I915_WRITE(AUD_PIN_BUF_CTL,
++				   (I915_READ(AUD_PIN_BUF_CTL) |
++				    AUD_PIN_BUF_ENABLE));
+ 	}
+ 
+ 	return ret;
+diff --git a/drivers/gpu/drm/i915/i915_reg.h b/drivers/gpu/drm/i915/i915_reg.h
+index e1fe356463ec..ccfea9c2b8bf 100644
+--- a/drivers/gpu/drm/i915/i915_reg.h
++++ b/drivers/gpu/drm/i915/i915_reg.h
+@@ -9105,6 +9105,8 @@ enum {
+ #define   SKL_AUD_CODEC_WAKE_SIGNAL		(1 << 15)
+ 
+ #define AUD_FREQ_CNTRL			_MMIO(0x65900)
++#define AUD_PIN_BUF_CTL		_MMIO(0x48414)
++#define   AUD_PIN_BUF_ENABLE		REG_BIT(31)
+ 
+ /*
+  * HSW - ICL power wells
+-- 
+2.24.1
+