From 3b754ed6d1cd90017e66e5cc16f3923e4a952ffc Mon Sep 17 00:00:00 2001
From: Carlo Caione <ccaione@baylibre.com>
Date: Mon, 19 Dec 2022 09:43:05 +0100
Subject: [PATCH] drm/meson: Reduce the FIFO lines held when AFBC is not used
Git-commit: 3b754ed6d1cd90017e66e5cc16f3923e4a952ffc
Patch-mainline: v6.2-rc3
References: git-fixes
Having a bigger number of FIFO lines held after vsync is only useful to
SoCs using AFBC to give time to the AFBC decoder to be reset, configured
and enabled again.
For SoCs not using AFBC this, on the contrary, is causing on some
displays issues and a few pixels vertical offset in the displayed image.
Conditionally increase the number of lines held after vsync only for
SoCs using AFBC, leaving the default value for all the others.
Fixes: 24e0d4058eff ("drm/meson: hold 32 lines after vsync to give time for AFBC start")
Signed-off-by: Carlo Caione <ccaione@baylibre.com>
Acked-by: Martin Blumenstingl <martin.blumenstingl@googlemail.com>
Acked-by: Neil Armstrong <neil.armstrong@linaro.org>
[narmstrong: added fixes tag]
Signed-off-by: Neil Armstrong <neil.armstrong@linaro.org>
Link: https://patchwork.freedesktop.org/patch/msgid/20221216-afbc_s905x-v1-0-033bebf780d9@baylibre.com
Acked-by: Takashi Iwai <tiwai@suse.de>
---
drivers/gpu/drm/meson/meson_viu.c | 5 ++---
1 file changed, 2 insertions(+), 3 deletions(-)
diff --git a/drivers/gpu/drm/meson/meson_viu.c b/drivers/gpu/drm/meson/meson_viu.c
index d4b907889a21..cd399b0b7181 100644
--- a/drivers/gpu/drm/meson/meson_viu.c
+++ b/drivers/gpu/drm/meson/meson_viu.c
@@ -436,15 +436,14 @@ void meson_viu_init(struct meson_drm *priv)
/* Initialize OSD1 fifo control register */
reg = VIU_OSD_DDR_PRIORITY_URGENT |
- 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 */
if (meson_vpu_is_compatible(priv, VPU_COMPATIBLE_G12A))
- reg |= VIU_OSD_BURST_LENGTH_32;
+ reg |= (VIU_OSD_BURST_LENGTH_32 | VIU_OSD_HOLD_FIFO_LINES(31));
else
- reg |= VIU_OSD_BURST_LENGTH_64;
+ reg |= (VIU_OSD_BURST_LENGTH_64 | VIU_OSD_HOLD_FIFO_LINES(4));
writel_relaxed(reg, priv->io_base + _REG(VIU_OSD1_FIFO_CTRL_STAT));
writel_relaxed(reg, priv->io_base + _REG(VIU_OSD2_FIFO_CTRL_STAT));
--
2.35.3