[RX51] workaround lines issue (#309)

This works around the lines issue using a patch from Ti: https://lkml.org/lkml/2017/6/30/163

aports/main/linux-postmarketos/0001-rx51-drm-regression-workaround.patch

+--- a/drivers/gpu/drm/omapdrm/omap_crtc.c
++++ b/drivers/gpu/drm/omapdrm/omap_crtc.c
+@@ -36,12 +36,15 @@ struct omap_crtc {
+ 
+ 	struct videomode vm;
+ 
+-	bool ignore_digit_sync_lost;
++	bool ignore_sync_lost;
+ 
+ 	bool enabled;
+ 	bool pending;
+ 	wait_queue_head_t pending_wait;
+ 	struct drm_pending_vblank_event *event;
++
++	struct work_struct error_work;
++	u32 error_channels;
+ };
+ 
+ /* -----------------------------------------------------------------------------
+@@ -157,7 +160,7 @@ static void omap_crtc_set_enabled(struct drm_crtc *crtc, bool enable)
+ 		 * Digit output produces some sync lost interrupts during the
+ 		 * first frame when enabling, so we need to ignore those.
+ 		 */
+-		omap_crtc->ignore_digit_sync_lost = true;
++		omap_crtc->ignore_sync_lost = true;
+ 	}
+ 
+ 	framedone_irq = priv->dispc_ops->mgr_get_framedone_irq(channel);
+@@ -191,7 +194,7 @@ static void omap_crtc_set_enabled(struct drm_crtc *crtc, bool enable)
+ 	}
+ 
+ 	if (omap_crtc->channel == OMAP_DSS_CHANNEL_DIGIT) {
+-		omap_crtc->ignore_digit_sync_lost = false;
++		omap_crtc->ignore_sync_lost = false;
+ 		/* make sure the irq handler sees the value above */
+ 		mb();
+ 	}
+@@ -263,17 +266,65 @@ static const struct dss_mgr_ops mgr_ops = {
+  * Setup, Flush and Page Flip
+  */
+ 
++static void omap_crtc_error_worker(struct work_struct *work)
++{
++	struct omap_crtc *omap_crtc = container_of(work, struct omap_crtc, error_work);
++	struct drm_crtc *crtc = &omap_crtc->base;
++	struct drm_device *dev = omap_crtc->base.dev;
++	struct omap_drm_private *priv = dev->dev_private;
++
++	drm_modeset_lock(&crtc->mutex, NULL);
++
++	dev_warn(dev->dev, "sync lost on %s, enabling & disabling...\n",
++		omap_crtc->name);
++
++	priv->dispc_ops->mgr_enable(omap_crtc->channel, false);
++
++	msleep(50);
++	dev_warn(dev->dev, "sync lost enabling %s\n",
++			omap_crtc->name);
++
++	priv->dispc_ops->mgr_enable(omap_crtc->channel, true);
++
++	msleep(50);
++
++	dev_warn(dev->dev, "sync lost recovery done on on %s\n",
++		omap_crtc->name);
++
++	omap_crtc->ignore_sync_lost = false;
++	/* make sure the irq handler sees the value above */
++	mb();
++
++	drm_modeset_unlock(&crtc->mutex);
++}
++
+ void omap_crtc_error_irq(struct drm_crtc *crtc, uint32_t irqstatus)
+ {
+ 	struct omap_crtc *omap_crtc = to_omap_crtc(crtc);
++	struct drm_device *dev = omap_crtc->base.dev;
++	struct omap_drm_private *priv = dev->dev_private;
++	enum omap_channel channel = omap_crtc_channel(crtc);
++	u32 sync_lost_irq;
++	bool sync_lost;
++
++	sync_lost_irq = priv->dispc_ops->mgr_get_sync_lost_irq(channel);
+ 
+-	if (omap_crtc->ignore_digit_sync_lost) {
+-		irqstatus &= ~DISPC_IRQ_SYNC_LOST_DIGIT;
+-		if (!irqstatus)
+-			return;
++	sync_lost = irqstatus & sync_lost_irq;
++
++	if (sync_lost) {
++		if (omap_crtc->ignore_sync_lost) {
++			irqstatus &= ~sync_lost_irq;
++		} else {
++			/* error worker will set this to false */
++			omap_crtc->ignore_sync_lost = true;
++			schedule_work(&omap_crtc->error_work);
++		}
+ 	}
+ 
+-	DRM_ERROR_RATELIMITED("%s: errors: %08x\n", omap_crtc->name, irqstatus);
++	if (!irqstatus)
++		return;
++
++	printk("%s: errors: %08x\n", omap_crtc->name, irqstatus);
+ }
+ 
+ void omap_crtc_vblank_irq(struct drm_crtc *crtc)
+@@ -612,6 +663,8 @@ struct drm_crtc *omap_crtc_init(struct drm_device *dev,
+ 
+ 	init_waitqueue_head(&omap_crtc->pending_wait);
+ 
++	INIT_WORK(&omap_crtc->error_work, omap_crtc_error_worker);
++
+ 	omap_crtc->channel = channel;
+ 	omap_crtc->name = channel_names[channel];

aports/main/linux-postmarketos/APKBUILD

@@ -15,7 +15,7 @@ pkgname=linux-${_flavor}
 
 pkgver=4.12.4
 _kernver=${pkgver}
-pkgrel=2
+pkgrel=3
 
 arch="all"
 pkgdesc="Mainline Linux for pmOS supported chipsets (OMAP)"
@@ -28,6 +28,7 @@ source="
 	https://cdn.kernel.org/pub/linux/kernel/v${pkgver%%.*}.x/linux-$_kernver.tar.xz
 	config-${_flavor}.armhf
 	config-${_flavor}.x86_64
+        0001-rx51-drm-regression-workaround.patch
 "
 subpackages="$pkgname-dev::$CBUILD_ARCH"
 license="GPL2"
@@ -172,4 +173,5 @@ dev() {
 
 sha512sums="beb3c7644f12925301aedcc0cfc347cd086ce0486d3a4fe5a59fd4e00452c5495cec1eb7a294b83bd0d4a55238077d0b3766824b70e92e9b211b3f3146b6cc68  linux-4.12.4.tar.xz
 3f4435ce0cf227e4ba64aa7153c913370c53069e34a376e453786d601b5a73706a3f44b002fab1b10a72dc94e896c1d8fb462c2b78e62ed69c468d98aa7220da  config-postmarketos.armhf
-c2bdaf8885dab4c3d3f96d856179138fed2d33cadcb9b33997238c8395a13eb8cb2b35f5f887339c5b47b34c8aa1bcd121059987601c1908103b66c23da478f0  config-postmarketos.x86_64"
+c2bdaf8885dab4c3d3f96d856179138fed2d33cadcb9b33997238c8395a13eb8cb2b35f5f887339c5b47b34c8aa1bcd121059987601c1908103b66c23da478f0  config-postmarketos.x86_64
+17c48bb7b4218297bd2be6faa5b6570ce1560a33385237a9962c0884d782c9a722a25a30077b6721d2943a9b98c29dcad6adfef718b0163c559c19a79519319b  0001-rx51-drm-regression-workaround.patch"