linux-kernel - Re: [PATCH 2/2] drm/msm: Quiet error during failure in optional resource mappings.

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Message-ID: <CAF6AEGstctXSCwW9Hv=MmB_Ca1VGA_DZNtzvqSY-1NqPTK+WPQ@mail.gmail.com>
Date:   Mon, 29 Jun 2020 12:57:59 -0700
From:   Rob Clark <robdclark@...il.com>
To:     Eric Anholt <eric@...olt.net>
Cc:     dri-devel <dri-devel@...ts.freedesktop.org>,
        linux-arm-msm <linux-arm-msm@...r.kernel.org>,
        freedreno <freedreno@...ts.freedesktop.org>,
        Sean Paul <sean@...rly.run>,
        Jordan Crouse <jcrouse@...eaurora.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 2/2] drm/msm: Quiet error during failure in optional
 resource mappings.

On Mon, Jun 29, 2020 at 11:19 AM Eric Anholt <eric@...olt.net> wrote:
>
> We don't expect to find vbif_nrt or regdma on cheza, but were clogging
> up dmesg with errors about it.

nit: s/cheza/sdm845/ (since this really applies to the SoC rather than
the board..

also, maybe msm_ioremap_optional() ?

BR,
-R

>
> Signed-off-by: Eric Anholt <eric@...olt.net>
> ---
>  drivers/gpu/drm/msm/disp/dpu1/dpu_kms.c |  4 ++--
>  drivers/gpu/drm/msm/msm_drv.c           | 22 ++++++++++++++++++----
>  drivers/gpu/drm/msm/msm_drv.h           |  2 ++
>  3 files changed, 22 insertions(+), 6 deletions(-)
>
> diff --git a/drivers/gpu/drm/msm/disp/dpu1/dpu_kms.c b/drivers/gpu/drm/msm/disp/dpu1/dpu_kms.c
> index a4ab802fee6d..d9aef2b5e930 100644
> --- a/drivers/gpu/drm/msm/disp/dpu1/dpu_kms.c
> +++ b/drivers/gpu/drm/msm/disp/dpu1/dpu_kms.c
> @@ -838,13 +838,13 @@ static int dpu_kms_hw_init(struct msm_kms *kms)
>                 dpu_kms->vbif[VBIF_RT] = NULL;
>                 goto error;
>         }
> -       dpu_kms->vbif[VBIF_NRT] = msm_ioremap(dpu_kms->pdev, "vbif_nrt", "vbif_nrt");
> +       dpu_kms->vbif[VBIF_NRT] = msm_ioremap_quiet(dpu_kms->pdev, "vbif_nrt", "vbif_nrt");
>         if (IS_ERR(dpu_kms->vbif[VBIF_NRT])) {
>                 dpu_kms->vbif[VBIF_NRT] = NULL;
>                 DPU_DEBUG("VBIF NRT is not defined");
>         }
>
> -       dpu_kms->reg_dma = msm_ioremap(dpu_kms->pdev, "regdma", "regdma");
> +       dpu_kms->reg_dma = msm_ioremap_quiet(dpu_kms->pdev, "regdma", "regdma");
>         if (IS_ERR(dpu_kms->reg_dma)) {
>                 dpu_kms->reg_dma = NULL;
>                 DPU_DEBUG("REG_DMA is not defined");
> diff --git a/drivers/gpu/drm/msm/msm_drv.c b/drivers/gpu/drm/msm/msm_drv.c
> index f6ce40bf3699..df4a3c6a49cd 100644
> --- a/drivers/gpu/drm/msm/msm_drv.c
> +++ b/drivers/gpu/drm/msm/msm_drv.c
> @@ -120,8 +120,8 @@ struct clk *msm_clk_get(struct platform_device *pdev, const char *name)
>         return clk;
>  }
>
> -void __iomem *msm_ioremap(struct platform_device *pdev, const char *name,
> -               const char *dbgname)
> +void __iomem *_msm_ioremap(struct platform_device *pdev, const char *name,
> +                          const char *dbgname, bool quiet)
>  {
>         struct resource *res;
>         unsigned long size;
> @@ -133,7 +133,8 @@ void __iomem *msm_ioremap(struct platform_device *pdev, const char *name,
>                 res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
>
>         if (!res) {
> -               DRM_DEV_ERROR(&pdev->dev, "failed to get memory resource: %s\n", name);
> +               if (!quiet)
> +                       DRM_DEV_ERROR(&pdev->dev, "failed to get memory resource: %s\n", name);
>                 return ERR_PTR(-EINVAL);
>         }
>
> @@ -141,7 +142,8 @@ void __iomem *msm_ioremap(struct platform_device *pdev, const char *name,
>
>         ptr = devm_ioremap(&pdev->dev, res->start, size);
>         if (!ptr) {
> -               DRM_DEV_ERROR(&pdev->dev, "failed to ioremap: %s\n", name);
> +               if (!quiet)
> +                       DRM_DEV_ERROR(&pdev->dev, "failed to ioremap: %s\n", name);
>                 return ERR_PTR(-ENOMEM);
>         }
>
> @@ -151,6 +153,18 @@ void __iomem *msm_ioremap(struct platform_device *pdev, const char *name,
>         return ptr;
>  }
>
> +void __iomem *msm_ioremap(struct platform_device *pdev, const char *name,
> +                         const char *dbgname)
> +{
> +       return _msm_ioremap(pdev, name, dbgname, false);
> +}
> +
> +void __iomem *msm_ioremap_quiet(struct platform_device *pdev, const char *name,
> +                               const char *dbgname)
> +{
> +       return _msm_ioremap(pdev, name, dbgname, true);
> +}
> +
>  void msm_writel(u32 data, void __iomem *addr)
>  {
>         if (reglog)
> diff --git a/drivers/gpu/drm/msm/msm_drv.h b/drivers/gpu/drm/msm/msm_drv.h
> index e2d6a6056418..2687f7a42c15 100644
> --- a/drivers/gpu/drm/msm/msm_drv.h
> +++ b/drivers/gpu/drm/msm/msm_drv.h
> @@ -411,6 +411,8 @@ struct clk *msm_clk_bulk_get_clock(struct clk_bulk_data *bulk, int count,
>         const char *name);
>  void __iomem *msm_ioremap(struct platform_device *pdev, const char *name,
>                 const char *dbgname);
> +void __iomem *msm_ioremap_quiet(struct platform_device *pdev, const char *name,
> +               const char *dbgname);
>  void msm_writel(u32 data, void __iomem *addr);
>  u32 msm_readl(const void __iomem *addr);
>
> --
> 2.26.2
>