Add kernel patch for gru-kevin cursor lag, fixes #225

Added additioanl kernel patch to correct analogix_dp_transfer failue

Author: SolidEva

kernel/patches/arm64/drm/0001-drm-bridge-analogix_dp-Don-t-return-EBUSY-when-msg-s.patch

@@ -0,0 +1,44 @@
+From 6958888b47956821a2bbbaeeb2deb27d32337bf0 Mon Sep 17 00:00:00 2001
+From: SolidHal <[email protected]>
+Date: Wed, 23 Dec 2020 09:24:11 -0800
+Subject: [PATCH 1/2] drm/bridge: analogix_dp: Don't return -EBUSY when
+ msg->size is 0 in aux transaction
+
+The analogix_dp_transfer() will return -EBUSY if num_transferred is zero.
+But sometimes we will send a bare address packet to start the transaction,
+like drm_dp_i2c_xfer() show:
+	......
+	/* Send a bare address packet to start the transaction.
+	 * Zero sized messages specify an address only (bare
+	 * address) transaction.
+	 */
+	msg.buffer = NULL;
+	msg.size = 0;
+	err = drm_dp_i2c_do_msg(aux, &msg);
+	......
+
+In this case, the msg->size is zero, so the num_transferred will be zero too.
+We can't return -EBUSY here, let's we return num_transferred if num_transferred
+equals msg->size.
+
+from: https://chromium.googlesource.com/chromiumos/third_party/kernel/+/e7629f9b475ce9a0b70126e907049b0e1468010d%5E%21/#F0
+---
+ drivers/gpu/drm/bridge/analogix/analogix_dp_reg.c | 2 +-
+ 1 file changed, 1 insertion(+), 1 deletion(-)
+
+diff --git a/drivers/gpu/drm/bridge/analogix/analogix_dp_reg.c b/drivers/gpu/drm/bridge/analogix/analogix_dp_reg.c
+index 914c569ab8c1..ee6cda10bca4 100644
+--- a/drivers/gpu/drm/bridge/analogix/analogix_dp_reg.c
++++ b/drivers/gpu/drm/bridge/analogix/analogix_dp_reg.c
+@@ -1222,7 +1222,7 @@ ssize_t analogix_dp_transfer(struct analogix_dp_device *dp,
+ 		 (msg->request & ~DP_AUX_I2C_MOT) == DP_AUX_NATIVE_READ)
+ 		msg->reply = DP_AUX_NATIVE_REPLY_ACK;
+ 
+-	return num_transferred > 0 ? num_transferred : -EBUSY;
++	return (num_transferred == msg->size) ? num_transferred : -EBUSY;
+ 
+ aux_error:
+ 	/* if aux err happen, reset aux */
+-- 
+2.20.1
+

kernel/patches/arm64/drm/0002-drm-rockchip-Only-wait-for-panel-ACK-on-PSR-entry.patch

@@ -0,0 +1,43 @@
+From 30dcb9e2d1af10290d0764860b47b6f4848a1b93 Mon Sep 17 00:00:00 2001
+From: SolidHal <[email protected]>
+Date: Wed, 23 Dec 2020 10:03:26 -0800
+Subject: [PATCH 2/2] drm/rockchip: Only wait for panel ACK on PSR entry
+
+This patch was brought upstream already from chromium/rockchip but
+was done so incorrectly.
+
+We currently wait for the panel to mirror our intended PSR state
+before continuing on both PSR enter and PSR exit. This is really
+only important to do when we're entering PSR, since we want to
+be sure the last frame we pushed is being served from the panel's
+internal fb before shutting down the soc blocks (vop/analogix).
+
+This patch changes the behavior such that we only wait for the
+panel to complete the PSR transition when we're entering PSR, and
+to skip verification when we're exiting.
+
+Without this, the system essentially freezes for ~100ms while it waits for
+confirmation that PSR is disabled. The most noticible behavior is the cursor jumping
+on quick inputs. 
+
+from: https://chromium.googlesource.com/chromiumos/third_party/kernel/+/e47a7da072d1a2ca8fdc62f3e32291c0d1a41145%5E%21/#F0
+---
+ drivers/gpu/drm/bridge/analogix/analogix_dp_core.c | 2 +-
+ 1 file changed, 1 insertion(+), 1 deletion(-)
+
+diff --git a/drivers/gpu/drm/bridge/analogix/analogix_dp_core.c b/drivers/gpu/drm/bridge/analogix/analogix_dp_core.c
+index aa1bb86293fd..163bc069f77a 100644
+--- a/drivers/gpu/drm/bridge/analogix/analogix_dp_core.c
++++ b/drivers/gpu/drm/bridge/analogix/analogix_dp_core.c
+@@ -1055,7 +1055,7 @@ static int analogix_dp_disable_psr(struct analogix_dp_device *dp)
+ 	psr_vsc.db[0] = 0;
+ 	psr_vsc.db[1] = 0;
+ 
+-	return analogix_dp_send_psr_spd(dp, &psr_vsc, true);
++	return analogix_dp_send_psr_spd(dp, &psr_vsc, false);
+ }
+ 
+ /*
+-- 
+2.20.1
+

scripts/BuildScripts/KernelScripts/patchKernel.sh

@@ -41,9 +41,9 @@ if [ "$TARGET" == "$ARCH_ARMHF" ]; then
     for i in "$PATCHES"/DTS/*.patch; do echo $i; patch -p1 < $i; done
     for i in "$PATCHES"/kernel/*.patch; do echo $i; patch -p1 < $i; done
 elif [ "$TARGET" == "$ARCH_ARM64" ]; then
-    echo skip for now
+    #echo skip for now
     #for i in "$PATCHES"/kernel/*.patch; do echo $i; patch -p1 < $i; done
-    # for i in "$PATCHES"/drm/*.patch; do echo $i; patch -p1 < $i; done
+    for i in "$PATCHES"/drm/*.patch; do echo $i; patch -p1 < $i; done
     # for i in "$PATCHES"/cros-drm/*.patch; do echo $i; patch -p1 < $i; done
     # for i in "$PATCHES"/alarm/*.patch; do echo $i; patch -p1 < $i; done
 else