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	Linux v4.19-rc4-176-g211b100a5ced
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From patchwork Wed Jul 25 12:29:07 2018
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Subject: drm/vc4: Fix the "no scaling" case on multi-planar YUV formats
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From: Boris Brezillon <boris.brezillon@bootlin.com>
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X-Patchwork-Id: 240917
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Message-Id: <20180725122907.13702-1-boris.brezillon@bootlin.com>
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To: Eric Anholt <eric@anholt.net>
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Cc: David Airlie <airlied@linux.ie>,
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 Boris Brezillon <boris.brezillon@bootlin.com>, stable@vger.kernel.org,
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 dri-devel@lists.freedesktop.org
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Date: Wed, 25 Jul 2018 14:29:07 +0200
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When there's no scaling requested ->is_unity should be true no matter
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the format.
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Also, when no scaling is requested and we have a multi-planar YUV
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format, we should leave ->y_scaling[0] to VC4_SCALING_NONE and only
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set ->x_scaling[0] to VC4_SCALING_PPF.
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Doing this fixes an hardly visible artifact (seen when using modetest
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and a rather big overlay plane in YUV420).
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Fixes: fc04023fafec ("drm/vc4: Add support for YUV planes.")
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Cc: <stable@vger.kernel.org>
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Signed-off-by: Boris Brezillon <boris.brezillon@bootlin.com>
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Reviewed-by: Eric Anholt <eric@anholt.net>
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---
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 drivers/gpu/drm/vc4/vc4_plane.c | 25 ++++++++++++-------------
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 1 file changed, 12 insertions(+), 13 deletions(-)
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diff --git a/drivers/gpu/drm/vc4/vc4_plane.c b/drivers/gpu/drm/vc4/vc4_plane.c
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index cfb50fedfa2b..a3275fa66b7b 100644
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--- a/drivers/gpu/drm/vc4/vc4_plane.c
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+++ b/drivers/gpu/drm/vc4/vc4_plane.c
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@@ -297,6 +297,9 @@ static int vc4_plane_setup_clipping_and_scaling(struct drm_plane_state *state)
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 	vc4_state->y_scaling[0] = vc4_get_scaling_mode(vc4_state->src_h[0],
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 						       vc4_state->crtc_h);
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+	vc4_state->is_unity = (vc4_state->x_scaling[0] == VC4_SCALING_NONE &&
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+			       vc4_state->y_scaling[0] == VC4_SCALING_NONE);
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+
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 	if (num_planes > 1) {
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 		vc4_state->is_yuv = true;
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@@ -312,24 +315,17 @@ static int vc4_plane_setup_clipping_and_scaling(struct drm_plane_state *state)
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 			vc4_get_scaling_mode(vc4_state->src_h[1],
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 					     vc4_state->crtc_h);
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-		/* YUV conversion requires that scaling be enabled,
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-		 * even on a plane that's otherwise 1:1.  Choose TPZ
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-		 * for simplicity.
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+		/* YUV conversion requires that horizontal scaling be enabled,
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+		 * even on a plane that's otherwise 1:1. Looks like only PPF
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+		 * works in that case, so let's pick that one.
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 		 */
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-		if (vc4_state->x_scaling[0] == VC4_SCALING_NONE)
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-			vc4_state->x_scaling[0] = VC4_SCALING_TPZ;
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-		if (vc4_state->y_scaling[0] == VC4_SCALING_NONE)
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-			vc4_state->y_scaling[0] = VC4_SCALING_TPZ;
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+		if (vc4_state->is_unity)
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+			vc4_state->x_scaling[0] = VC4_SCALING_PPF;
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 	} else {
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 		vc4_state->x_scaling[1] = VC4_SCALING_NONE;
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 		vc4_state->y_scaling[1] = VC4_SCALING_NONE;
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 	}
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-	vc4_state->is_unity = (vc4_state->x_scaling[0] == VC4_SCALING_NONE &&
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-			       vc4_state->y_scaling[0] == VC4_SCALING_NONE &&
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-			       vc4_state->x_scaling[1] == VC4_SCALING_NONE &&
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-			       vc4_state->y_scaling[1] == VC4_SCALING_NONE);
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-
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 	/* No configuring scaling on the cursor plane, since it gets
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 	   non-vblank-synced updates, and scaling requires requires
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 	   LBM changes which have to be vblank-synced.
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@@ -672,7 +668,10 @@ static int vc4_plane_mode_set(struct drm_plane *plane,
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 		vc4_dlist_write(vc4_state, SCALER_CSC2_ITR_R_601_5);
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 	}
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-	if (!vc4_state->is_unity) {
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+	if (vc4_state->x_scaling[0] != VC4_SCALING_NONE ||
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+	    vc4_state->x_scaling[1] != VC4_SCALING_NONE ||
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+	    vc4_state->y_scaling[0] != VC4_SCALING_NONE ||
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+	    vc4_state->y_scaling[1] != VC4_SCALING_NONE) {
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 		/* LBM Base Address. */
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 		if (vc4_state->y_scaling[0] != VC4_SCALING_NONE ||
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 		    vc4_state->y_scaling[1] != VC4_SCALING_NONE) {
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							@ -1 +1 @@
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ae596de1a0c8c2c924dc99d23c026259372ab234
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211b100a5ceda9d1856a3f84334f9ca5f680b638
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@ -69,7 +69,7 @@ Summary: The Linux kernel
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# The rc snapshot level
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%global rcrev 4
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# The git snapshot level
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%define gitrev 3
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%define gitrev 4
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# Set rpm version accordingly
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%define rpmversion 4.%{upstream_sublevel}.0
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%endif
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@ -592,9 +592,6 @@ Patch309: gpio-pxa-handle-corner-case-of-unprobed-device.patch
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Patch330: bcm2835-cpufreq-add-CPU-frequency-control-driver.patch
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# https://patchwork.freedesktop.org/patch/240917/
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Patch331: drm-vc4-Fix-the-no-scaling-case-on-multi-planar-YUV-formats.patch
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# Fix for AllWinner A64 Timer Errata, still not final
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# https://patchwork.kernel.org/patch/10392891/
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Patch350: arm64-arch_timer-Workaround-for-Allwinner-A64-timer-instability.patch
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@ -1879,6 +1876,9 @@ fi
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#
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#
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%changelog
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* Fri Sep 21 2018 Jeremy Cline <jcline@redhat.com> - 4.19.0-0.rc4.git4.1
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- Linux v4.19-rc4-176-g211b100a5ced
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* Thu Sep 20 2018 Jeremy Cline <jcline@redhat.com> - 4.19.0-0.rc4.git3.1
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- Linux v4.19-rc4-137-gae596de1a0c8
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								sources
									
									
									
									
									
								
							@ -1,3 +1,3 @@
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SHA512 (linux-4.18.tar.xz) = 950eb85ac743b291afe9f21cd174d823e25f11883ee62cecfbfff8fe8c5672aae707654b1b8f29a133b1f2e3529e63b9f7fba4c45d6dacccc8000b3a9a9ae038
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SHA512 (patch-4.19-rc4.xz) = 31fa976573d724ab5592dbb97473c5523dea635e0f1235bb61ca8e81b7146218e277238039b817a82a3763d0b667038cb85a41fd103d680037db7cad40a88cd3
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SHA512 (patch-4.19-rc4-git3.xz) = eebf7845c05ea3374adb2761476e68bf6ceae3730e4e58984e56717ffd09d06b482ba302d97abfdf0de8fb6322a5f99cb10dc422735939f42253107de7dcad9c
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SHA512 (patch-4.19-rc4-git4.xz) = e75a9888c04546a06050174f2e9f5342c1955436d82729d2c8c8168ece128b1ab829bebdc80de5b553a438926dc70d6f2f95083ea7dbd2cc140bfaa05b14a6a4
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