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From: Eric Anholt <eric@anholt.net>
To: dri-devel@lists.freedesktop.org,
	"Noralf Trønnes" <noralf@tronnes.org>,
	"Rob Herring" <robh+dt@kernel.org>,
	"Mark Rutland" <mark.rutland@arm.com>,
	devicetree@vger.kernel.org
Cc: linux-kernel@vger.kernel.org,
	Heiner Kallweit <hkallweit1@gmail.com>,
	Eric Anholt <eric@anholt.net>
Subject: [PATCH 3/3] drm/tinydrm: Fix setting of the column/page end addresses.
Date: Wed, 24 Oct 2018 11:43:13 -0700	[thread overview]
Message-ID: <20181024184313.2967-4-eric@anholt.net> (raw)
In-Reply-To: <20181024184313.2967-1-eric@anholt.net>

If the clipped dirty region's x/y happened to align to 256, we would
have set the top 8 bits wrong.  Noticed by inspection, not by
reproducing a bug.

Signed-off-by: Eric Anholt <eric@anholt.net>
---
 drivers/gpu/drm/tinydrm/mipi-dbi.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/gpu/drm/tinydrm/mipi-dbi.c b/drivers/gpu/drm/tinydrm/mipi-dbi.c
index cb3441e51d5f..1bb870021f6e 100644
--- a/drivers/gpu/drm/tinydrm/mipi-dbi.c
+++ b/drivers/gpu/drm/tinydrm/mipi-dbi.c
@@ -240,10 +240,10 @@ static int mipi_dbi_fb_dirty(struct drm_framebuffer *fb,
 
 	mipi_dbi_command(mipi, MIPI_DCS_SET_COLUMN_ADDRESS,
 			 (clip.x1 >> 8) & 0xFF, clip.x1 & 0xFF,
-			 (clip.x2 >> 8) & 0xFF, (clip.x2 - 1) & 0xFF);
+			 ((clip.x2 - 1) >> 8) & 0xFF, (clip.x2 - 1) & 0xFF);
 	mipi_dbi_command(mipi, MIPI_DCS_SET_PAGE_ADDRESS,
 			 (clip.y1 >> 8) & 0xFF, clip.y1 & 0xFF,
-			 (clip.y2 >> 8) & 0xFF, (clip.y2 - 1) & 0xFF);
+			 ((clip.y2 - 1) >> 8) & 0xFF, (clip.y2 - 1) & 0xFF);
 
 	ret = mipi_dbi_command_buf(mipi, MIPI_DCS_WRITE_MEMORY_START, tr,
 				(clip.x2 - clip.x1) * (clip.y2 - clip.y1) * 2);
-- 
2.19.1


  parent reply	other threads:[~2018-10-24 18:43 UTC|newest]

Thread overview: 15+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2018-10-24 18:43 [PATCH 0/3] drm: tinydrm driver for adafruit PiTFT 3.5" touchscreen Eric Anholt
2018-10-24 18:43 ` [PATCH 1/3] dt-bindings: new binding for Himax HX8357D display panels Eric Anholt
2018-10-25 21:42   ` Rob Herring
2018-10-27 16:10   ` Noralf Trønnes
2018-10-24 18:43 ` [PATCH 2/3] drm: Add an hx8367d tinydrm driver Eric Anholt
2018-10-27 16:12   ` Noralf Trønnes
2018-10-30 22:46     ` Eric Anholt
2018-10-24 18:43 ` Eric Anholt [this message]
2018-10-27 16:13   ` [PATCH 3/3] drm/tinydrm: Fix setting of the column/page end addresses Noralf Trønnes
2018-10-25 16:29 ` [PATCH 0/3] drm: tinydrm driver for adafruit PiTFT 3.5" touchscreen Eric Anholt
2018-10-25 21:52   ` Noralf Trønnes
2018-10-26  2:30     ` Eric Anholt
2018-10-26 19:16       ` Noralf Trønnes
2018-10-26 20:57         ` Noralf Trønnes
2018-10-31 16:27   ` Noralf Trønnes

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