lkml.org 
[lkml]   [2021]   [Aug]   [8]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
Patch in this message
/
From
Subject[PATCH 6/8] drm/ingenic: Set DMA descriptor chain register when starting CRTC
Date
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
\
 
 \ /
  Last update: 2021-08-08 15:47    [W:0.641 / U:0.480 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site