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Message-ID: <20241024064931.1144605-3-csokas.bence@prolan.hu>
Date: Thu, 24 Oct 2024 08:49:23 +0200
From: Csókás, Bence <csokas.bence@...lan.hu>
To: <dmaengine@...r.kernel.org>, <linux-arm-kernel@...ts.infradead.org>,
<linux-sunxi@...ts.linux.dev>, <linux-kernel@...r.kernel.org>
CC: Mesih Kilinc <mesihkilinc@...il.com>, Vinod Koul <vkoul@...nel.org>,
Chen-Yu Tsai <wens@...e.org>, Jernej Skrabec <jernej.skrabec@...il.com>,
Samuel Holland <samuel@...lland.org>, Philipp Zabel <p.zabel@...gutronix.de>
Subject: [PATCH 02/10] dma-engine: sun4i: Add has_reset option to quirk
From: Mesih Kilinc <mesihkilinc@...il.com>
Allwinner suniv F1C100s has a reset bit for DMA in CCU. Sun4i do not
has this bit but in order to support suniv we need to add it. So add
support for reset bit.
Signed-off-by: Mesih Kilinc <mesihkilinc@...il.com>
---
drivers/dma/sun4i-dma.c | 23 +++++++++++++++++++++++
1 file changed, 23 insertions(+)
diff --git a/drivers/dma/sun4i-dma.c b/drivers/dma/sun4i-dma.c
index 5efbed7c546f..0b99b3884971 100644
--- a/drivers/dma/sun4i-dma.c
+++ b/drivers/dma/sun4i-dma.c
@@ -15,6 +15,7 @@
#include <linux/of_dma.h>
#include <linux/of_device.h>
#include <linux/platform_device.h>
+#include <linux/reset.h>
#include <linux/slab.h>
#include <linux/spinlock.h>
@@ -159,6 +160,7 @@ struct sun4i_dma_config {
u8 ddma_drq_sdram;
u8 max_burst;
+ bool has_reset;
};
struct sun4i_dma_pchan {
@@ -208,6 +210,7 @@ struct sun4i_dma_dev {
int irq;
spinlock_t lock;
const struct sun4i_dma_config *cfg;
+ struct reset_control *rst;
};
static struct sun4i_dma_dev *to_sun4i_dma_dev(struct dma_device *dev)
@@ -1215,6 +1218,15 @@ static int sun4i_dma_probe(struct platform_device *pdev)
return PTR_ERR(priv->clk);
}
+ if (priv->cfg->has_reset) {
+ priv->rst = devm_reset_control_get_exclusive(&pdev->dev,
+ NULL);
+ if (IS_ERR(priv->rst)) {
+ dev_err(&pdev->dev, "Failed to get reset control\n");
+ return PTR_ERR(priv->rst);
+ }
+ }
+
platform_set_drvdata(pdev, priv);
spin_lock_init(&priv->lock);
@@ -1287,6 +1299,16 @@ static int sun4i_dma_probe(struct platform_device *pdev)
return ret;
}
+ /* Deassert the reset control */
+ if (priv->rst) {
+ ret = reset_control_deassert(priv->rst);
+ if (ret) {
+ dev_err(&pdev->dev,
+ "Failed to deassert the reset control\n");
+ goto err_clk_disable;
+ }
+ }
+
/*
* Make sure the IRQs are all disabled and accounted for. The bootloader
* likes to leave these dirty
@@ -1356,6 +1378,7 @@ static struct sun4i_dma_config sun4i_a10_dma_cfg = {
.ddma_drq_sdram = SUN4I_DDMA_DRQ_TYPE_SDRAM,
.max_burst = SUN4I_MAX_BURST,
+ .has_reset = false,
};
static const struct of_device_id sun4i_dma_match[] = {
--
2.34.1
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