From 80b379d724b82e77ba828b07fb08108cd0374dcd Mon Sep 17 00:00:00 2001
From: Paul Cercueil <paul@crapouillou.net>
Date: Tue, 26 Oct 2021 19:12:38 +0100
Subject: drm/ingenic: Set DMA descriptor chain register when starting CRTC
Git-commit: 5410345f7acb4e84825e7e02f68480c95f3b7b15
Patch-mainline: v5.17-rc1
References: jsc#PED-1166 jsc#PED-1168 jsc#PED-1170 jsc#PED-1218 jsc#PED-1220 jsc#PED-1222 jsc#PED-1223 jsc#PED-1225
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>
Link: https://patchwork.freedesktop.org/patch/msgid/20211026181240.213806-5-paul@crapouillou.net
Tested-by: Nikolaus Schaller <hns@goldelico.com>
Reviewed-by: Christophe Branchereau <cbranchereau@gmail.com>
Acked-by: Patrik Jakobsson <pjakobsson@suse.de>
---
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 5dbeca0f8f37..cbc76cede99e 100644
--- a/drivers/gpu/drm/ingenic/ingenic-drm-drv.c
+++ b/drivers/gpu/drm/ingenic/ingenic-drm-drv.c
@@ -186,6 +186,10 @@ 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);
--
2.38.1