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From: Neil Armstrong <narmstrong@baylibre.com>
To: dri-devel@lists.freedesktop.org
Cc: khilman@baylibre.com, linux-amlogic@lists.infradead.org,
	ayan.halder@arm.com, linux-arm-kernel@lists.infradead.org,
	Neil Armstrong <narmstrong@baylibre.com>
Subject: [PATCH 6/7] drm/meson: hold 32 lines after vsync to give time for AFBC start
Date: Thu, 10 Oct 2019 11:25:25 +0200
Message-ID: <20191010092526.10419-7-narmstrong@baylibre.com> (raw)
In-Reply-To: <20191010092526.10419-1-narmstrong@baylibre.com>

When using an AFBC encoded frame, the AFBC Decoder must be resetted,
configured and enabled at each vsync IRQ.

To leave time for that, use the maximum lines hold time to give time
for AFBC setup and avoid visual glitches.

Signed-off-by: Neil Armstrong <narmstrong@baylibre.com>
---
 drivers/gpu/drm/meson/meson_viu.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/meson/meson_viu.c b/drivers/gpu/drm/meson/meson_viu.c
index cdd4962484db..be535e23fc99 100644
--- a/drivers/gpu/drm/meson/meson_viu.c
+++ b/drivers/gpu/drm/meson/meson_viu.c
@@ -414,7 +414,7 @@ void meson_viu_init(struct meson_drm *priv)
 
 	/* Initialize OSD1 fifo control register */
 	reg = VIU_OSD_DDR_PRIORITY_URGENT |
-		VIU_OSD_HOLD_FIFO_LINES(4) |
+		VIU_OSD_HOLD_FIFO_LINES(31) |
 		VIU_OSD_FIFO_DEPTH_VAL(32) | /* fifo_depth_val: 32*8=256 */
 		VIU_OSD_WORDS_PER_BURST(4) | /* 4 words in 1 burst */
 		VIU_OSD_FIFO_LIMITS(2);      /* fifo_lim: 2*16=32 */
-- 
2.22.0


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Thread overview: 22+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-10-10  9:25 [PATCH 0/7] drm/meson: add AFBC support Neil Armstrong
2019-10-10  9:25 ` [PATCH 1/7] drm/meson: add AFBC decoder registers for GXM and G12A Neil Armstrong
2019-10-10  9:25 ` [PATCH 2/7] drm/meson: store the framebuffer width for plane commit Neil Armstrong
2019-10-10  9:25 ` [PATCH 3/7] drm/meson: Add AFBCD module driver Neil Armstrong
2019-10-10  9:25 ` [PATCH 4/7] drm/meson: plane: add support for AFBC mode for OSD1 plane Neil Armstrong
2019-10-10 13:26   ` Ayan Halder
2019-10-10 13:41     ` Neil Armstrong
2019-10-10 17:31       ` Ayan Halder
2019-10-11  7:46         ` Daniel Vetter
2019-10-11  7:56           ` Daniel Stone
2019-10-11  8:41       ` Brian Starkey
2019-10-11  9:14         ` Neil Armstrong
2019-10-11 10:56           ` Brian Starkey
2019-10-11 12:07             ` Neil Armstrong
2019-10-15 11:18               ` Brian Starkey
2019-10-15 11:46                 ` Neil Armstrong
2019-10-11 17:25             ` Daniel Vetter
2019-10-14  9:11               ` Brian Starkey
2019-10-14  9:20                 ` Daniel Vetter
2019-10-10  9:25 ` [PATCH 5/7] drm/meson: viu: add AFBC modules routing functions Neil Armstrong
2019-10-10  9:25 ` Neil Armstrong [this message]
2019-10-10  9:25 ` [PATCH 7/7] drm/meson: crtc: add OSD1 plane AFBC commit Neil Armstrong

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