Re: [PATCH 1/1] drm/bridge: nwl-dsi: Use dev_err_probe

[Alexander Stein <alexander.stein@ew.tq-group.com>]

Hi,

Am Freitag, 13. März 2026, 12:32:58 CEST schrieb Alexander Stein:
> This simplifies the code as well as adding a probe deferral message.

Any feedback on this patch?

Thanks and best regards
Alexander

> Signed-off-by: Alexander Stein <alexander.stein@ew.tq-group.com>
> ---
>  drivers/gpu/drm/bridge/nwl-dsi.c | 114 +++++++++++--------------------
>  1 file changed, 40 insertions(+), 74 deletions(-)
> 
> diff --git a/drivers/gpu/drm/bridge/nwl-dsi.c b/drivers/gpu/drm/bridge/nwl-dsi.c
> index 2f7429b24fc20..0a39643b128ba 100644
> --- a/drivers/gpu/drm/bridge/nwl-dsi.c
> +++ b/drivers/gpu/drm/bridge/nwl-dsi.c
> @@ -9,6 +9,7 @@
>  #include <linux/bitfield.h>
>  #include <linux/bits.h>
>  #include <linux/clk.h>
> +#include <linux/dev_printk.h>
>  #include <linux/irq.h>
>  #include <linux/math64.h>
>  #include <linux/mfd/syscon.h>
> @@ -975,68 +976,46 @@ static int nwl_dsi_parse_dt(struct nwl_dsi *dsi)
>  	struct platform_device *pdev = to_platform_device(dsi->dev);
>  	struct clk *clk;
>  	void __iomem *base;
> -	int ret;
>  
>  	dsi->phy = devm_phy_get(dsi->dev, "dphy");
> -	if (IS_ERR(dsi->phy)) {
> -		ret = PTR_ERR(dsi->phy);
> -		if (ret != -EPROBE_DEFER)
> -			DRM_DEV_ERROR(dsi->dev, "Could not get PHY: %d\n", ret);
> -		return ret;
> -	}
> +	if (IS_ERR(dsi->phy))
> +		return dev_err_probe(dsi->dev, PTR_ERR(dsi->phy),
> +				     "Could not get PHY\n");
>  
>  	clk = devm_clk_get(dsi->dev, "lcdif");
> -	if (IS_ERR(clk)) {
> -		ret = PTR_ERR(clk);
> -		DRM_DEV_ERROR(dsi->dev, "Failed to get lcdif clock: %d\n",
> -			      ret);
> -		return ret;
> -	}
> +	if (IS_ERR(clk))
> +		return dev_err_probe(dsi->dev, PTR_ERR(clk),
> +				     "Failed to get lcdif clock\n");
>  	dsi->lcdif_clk = clk;
>  
>  	clk = devm_clk_get(dsi->dev, "core");
> -	if (IS_ERR(clk)) {
> -		ret = PTR_ERR(clk);
> -		DRM_DEV_ERROR(dsi->dev, "Failed to get core clock: %d\n",
> -			      ret);
> -		return ret;
> -	}
> +	if (IS_ERR(clk))
> +		return dev_err_probe(dsi->dev, PTR_ERR(clk),
> +				     "Failed to get core clock\n");
>  	dsi->core_clk = clk;
>  
>  	clk = devm_clk_get(dsi->dev, "phy_ref");
> -	if (IS_ERR(clk)) {
> -		ret = PTR_ERR(clk);
> -		DRM_DEV_ERROR(dsi->dev, "Failed to get phy_ref clock: %d\n",
> -			      ret);
> -		return ret;
> -	}
> +	if (IS_ERR(clk))
> +		return dev_err_probe(dsi->dev, PTR_ERR(clk),
> +				     "Failed to get phy_ref clock\n");
>  	dsi->phy_ref_clk = clk;
>  
>  	clk = devm_clk_get(dsi->dev, "rx_esc");
> -	if (IS_ERR(clk)) {
> -		ret = PTR_ERR(clk);
> -		DRM_DEV_ERROR(dsi->dev, "Failed to get rx_esc clock: %d\n",
> -			      ret);
> -		return ret;
> -	}
> +	if (IS_ERR(clk))
> +		return dev_err_probe(dsi->dev, PTR_ERR(clk),
> +				     "Failed to get rx_esc clock\n");
>  	dsi->rx_esc_clk = clk;
>  
>  	clk = devm_clk_get(dsi->dev, "tx_esc");
> -	if (IS_ERR(clk)) {
> -		ret = PTR_ERR(clk);
> -		DRM_DEV_ERROR(dsi->dev, "Failed to get tx_esc clock: %d\n",
> -			      ret);
> -		return ret;
> -	}
> +	if (IS_ERR(clk))
> +		return dev_err_probe(dsi->dev, PTR_ERR(clk),
> +				     "Failed to get tx_esc clock\n");
>  	dsi->tx_esc_clk = clk;
>  
>  	dsi->mux = devm_mux_control_get(dsi->dev, NULL);
> -	if (IS_ERR(dsi->mux)) {
> -		ret = PTR_ERR(dsi->mux);
> -		if (ret != -EPROBE_DEFER)
> -			DRM_DEV_ERROR(dsi->dev, "Failed to get mux: %d\n", ret);
> -		return ret;
> -	}
> +	if (IS_ERR(dsi->mux))
> +		return dev_err_probe(dsi->dev, PTR_ERR(dsi->mux),
> +				     "Failed to get mux\n");
>  
>  	base = devm_platform_ioremap_resource(pdev, 0);
>  	if (IS_ERR(base))
> @@ -1044,44 +1023,31 @@ static int nwl_dsi_parse_dt(struct nwl_dsi *dsi)
>  
>  	dsi->regmap =
>  		devm_regmap_init_mmio(dsi->dev, base, &nwl_dsi_regmap_config);
> -	if (IS_ERR(dsi->regmap)) {
> -		ret = PTR_ERR(dsi->regmap);
> -		DRM_DEV_ERROR(dsi->dev, "Failed to create NWL DSI regmap: %d\n",
> -			      ret);
> -		return ret;
> -	}
> +	if (IS_ERR(dsi->regmap))
> +		return dev_err_probe(dsi->dev, PTR_ERR(dsi->regmap),
> +				     "Failed to create NWL DSI regmap\n");
>  
>  	dsi->irq = platform_get_irq(pdev, 0);
> -	if (dsi->irq < 0) {
> -		DRM_DEV_ERROR(dsi->dev, "Failed to get device IRQ: %d\n",
> -			      dsi->irq);
> -		return dsi->irq;
> -	}
> +	if (dsi->irq < 0)
> +		return dev_err_probe(dsi->dev, dsi->irq,
> +				     "Failed to get device IRQ\n");
>  
>  	dsi->rst_pclk = devm_reset_control_get_exclusive(dsi->dev, "pclk");
> -	if (IS_ERR(dsi->rst_pclk)) {
> -		DRM_DEV_ERROR(dsi->dev, "Failed to get pclk reset: %ld\n",
> -			      PTR_ERR(dsi->rst_pclk));
> -		return PTR_ERR(dsi->rst_pclk);
> -	}
> +	if (IS_ERR(dsi->rst_pclk))
> +		return dev_err_probe(dsi->dev, PTR_ERR(dsi->rst_pclk),
> +				     "Failed to get pclk reset\n");
>  	dsi->rst_byte = devm_reset_control_get_exclusive(dsi->dev, "byte");
> -	if (IS_ERR(dsi->rst_byte)) {
> -		DRM_DEV_ERROR(dsi->dev, "Failed to get byte reset: %ld\n",
> -			      PTR_ERR(dsi->rst_byte));
> -		return PTR_ERR(dsi->rst_byte);
> -	}
> +	if (IS_ERR(dsi->rst_byte))
> +		return dev_err_probe(dsi->dev, PTR_ERR(dsi->rst_byte),
> +				     "Failed to get byte reset\n");
>  	dsi->rst_esc = devm_reset_control_get_exclusive(dsi->dev, "esc");
> -	if (IS_ERR(dsi->rst_esc)) {
> -		DRM_DEV_ERROR(dsi->dev, "Failed to get esc reset: %ld\n",
> -			      PTR_ERR(dsi->rst_esc));
> -		return PTR_ERR(dsi->rst_esc);
> -	}
> +	if (IS_ERR(dsi->rst_esc))
> +		return dev_err_probe(dsi->dev, PTR_ERR(dsi->rst_esc),
> +				     "Failed to get esc reset\n");
>  	dsi->rst_dpi = devm_reset_control_get_exclusive(dsi->dev, "dpi");
> -	if (IS_ERR(dsi->rst_dpi)) {
> -		DRM_DEV_ERROR(dsi->dev, "Failed to get dpi reset: %ld\n",
> -			      PTR_ERR(dsi->rst_dpi));
> -		return PTR_ERR(dsi->rst_dpi);
> -	}
> +	if (IS_ERR(dsi->rst_dpi))
> +		return dev_err_probe(dsi->dev, PTR_ERR(dsi->rst_dpi),
> +				     "Failed to get dpi reset\n");
>  	return 0;
>  }
>  
> 


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