[PATCH 6/8] drm/ingenic: Set DMA descriptor chain register when starting CRTC
From: Paul Cercueil <paul@crapouillou.net>
Date: 2021-08-08 13:46:38
Also in:
dri-devel, lkml
Subsystem:
drm drivers, drm drivers and misc gpu patches, ingenic jz47xx socs, the rest · Maintainers:
David Airlie, Simona Vetter, Maarten Lankhorst, Maxime Ripard, Thomas Zimmermann, Paul Cercueil, Linus Torvalds
Setting the DMA descriptor chain register in the probe function has been fine until now, because we only ever had one descriptor per foreground. As the driver will soon have real descriptor chains, and the DMA descriptor chain register updates itself to point to the current descriptor being processed, this register needs to be reset after a full modeset to point to the first descriptor of the chain. Signed-off-by: Paul Cercueil <paul@crapouillou.net> --- drivers/gpu/drm/ingenic/ingenic-drm-drv.c | 4 ++++ 1 file changed, 4 insertions(+)
diff --git a/drivers/gpu/drm/ingenic/ingenic-drm-drv.c b/drivers/gpu/drm/ingenic/ingenic-drm-drv.c
index 3fc01cffb00f..2eef174165a2 100644
--- a/drivers/gpu/drm/ingenic/ingenic-drm-drv.c
+++ b/drivers/gpu/drm/ingenic/ingenic-drm-drv.c@@ -184,6 +184,10 @@ static void ingenic_drm_crtc_atomic_enable(struct drm_crtc *crtc, regmap_write(priv->map, JZ_REG_LCD_STATE, 0); + /* Set address of our DMA descriptor chain */ + regmap_write(priv->map, JZ_REG_LCD_DA0, dma_hwdesc_addr(priv, 0)); + regmap_write(priv->map, JZ_REG_LCD_DA1, dma_hwdesc_addr(priv, 1)); + regmap_update_bits(priv->map, JZ_REG_LCD_CTRL, JZ_LCD_CTRL_ENABLE | JZ_LCD_CTRL_DISABLE, JZ_LCD_CTRL_ENABLE);
--
2.30.2