linux-kernel - [PATCH v2 4/6] drm/ingenic: Set DMA descriptor chain register when starting CRTC

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Message-Id: <20210811172309.314287-5-paul@crapouillou.net>
Date:   Wed, 11 Aug 2021 19:23:07 +0200
From:   Paul Cercueil <paul@...pouillou.net>
To:     David Airlie <airlied@...ux.ie>, Daniel Vetter <daniel@...ll.ch>
Cc:     "H . Nikolaus Schaller" <hns@...delico.com>,
        Paul Boddie <paul@...die.org.uk>,
        Sam Ravnborg <sam@...nborg.org>, list@...ndingux.net,
        linux-mips@...r.kernel.org, dri-devel@...ts.freedesktop.org,
        linux-kernel@...r.kernel.org, Paul Cercueil <paul@...pouillou.net>
Subject: [PATCH v2 4/6] drm/ingenic: Set DMA descriptor chain register when starting CRTC

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@...pouillou.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 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);
-- 
2.30.2