| Message ID | 20241024064931.1144605-3-csokas.bence@prolan.hu (mailing list archive) |
|---|---|
| State | New, archived |
| Headers | show |
| Series | [01/10] dma-engine: sun4i: Add a quirk to support different chips | expand |
On Do, 2024-10-24 at 08:49 +0200, Csókás, Bence wrote: > From: Mesih Kilinc <mesihkilinc@gmail.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@gmail.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); Aligning to open parenthesis will make checkpatch --strict happy. > + if (IS_ERR(priv->rst)) { > + dev_err(&pdev->dev, "Failed to get reset control\n"); Consider using dev_err_probe() here. > + 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; > + } > + } You can just call reset_control_deassert() unconditionally, it accepts a NULL parameter: https://docs.kernel.org/driver-api/reset.html#c.reset_control_deassert regards Philipp
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[] = {