linux-kernel - Re: [PATCH] drm: sti: remove useless fields from vtg structure

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Message-ID: <CA+M3ks5Ys=hKi9XvnwveP8BdLUKzXG+jL9O8FCirqHxNVhKLXA@mail.gmail.com>
Date:   Wed, 8 Nov 2017 14:55:06 +0100
From:   Benjamin Gaignard <benjamin.gaignard@...aro.org>
To:     Vincent Abriou <vincent.abriou@...com>,
        David Airlie <airlied@...ux.ie>,
        "dri-devel@...ts.freedesktop.org" <dri-devel@...ts.freedesktop.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Cc:     Benjamin Gaignard <benjamin.gaignard@...aro.org>
Subject: Re: [PATCH] drm: sti: remove useless fields from vtg structure

2017-11-08 14:04 GMT+01:00 Benjamin Gaignard <benjamin.gaignard@...aro.org>:
> Drivers are registered on platform bus so the private list
> could be replace by a call to of_find_device_by_node().
> Changing this also makes dev, np and link fields useless
> in vtg structure.
>
> Signed-off-by: Benjamin Gaignard <benjamin.gaignard@...aro.org>

Merge in drm-misc-next with Daniel's irc ack.


> ---
>  drivers/gpu/drm/sti/Kconfig   |  1 +
>  drivers/gpu/drm/sti/sti_vtg.c | 32 ++++++++------------------------
>  2 files changed, 9 insertions(+), 24 deletions(-)
>
> diff --git a/drivers/gpu/drm/sti/Kconfig b/drivers/gpu/drm/sti/Kconfig
> index acd7286..cca4b3c 100644
> --- a/drivers/gpu/drm/sti/Kconfig
> +++ b/drivers/gpu/drm/sti/Kconfig
> @@ -8,5 +8,6 @@ config DRM_STI
>         select DRM_PANEL
>         select FW_LOADER
>         select SND_SOC_HDMI_CODEC if SND_SOC
> +       select OF
>         help
>           Choose this option to enable DRM on STM stiH4xx chipset
> diff --git a/drivers/gpu/drm/sti/sti_vtg.c b/drivers/gpu/drm/sti/sti_vtg.c
> index 2dcba1d..5f75aea 100644
> --- a/drivers/gpu/drm/sti/sti_vtg.c
> +++ b/drivers/gpu/drm/sti/sti_vtg.c
> @@ -9,6 +9,7 @@
>
>  #include <linux/module.h>
>  #include <linux/notifier.h>
> +#include <linux/of_platform.h>
>  #include <linux/platform_device.h>
>
>  #include <drm/drmP.h>
> @@ -72,8 +73,6 @@
>  #define AWG_DELAY_ED        (-8)
>  #define AWG_DELAY_SD        (-7)
>
> -static LIST_HEAD(vtg_lookup);
> -
>  /*
>   * STI VTG register offset structure
>   *
> @@ -123,42 +122,31 @@ struct sti_vtg_sync_params {
>  /**
>   * STI VTG structure
>   *
> - * @dev: pointer to device driver
> - * @np: device node
>   * @regs: register mapping
>   * @sync_params: synchronisation parameters used to generate timings
>   * @irq: VTG irq
>   * @irq_status: store the IRQ status value
>   * @notifier_list: notifier callback
>   * @crtc: the CRTC for vblank event
> - * @link: List node to link the structure in lookup list
>   */
>  struct sti_vtg {
> -       struct device *dev;
> -       struct device_node *np;
>         void __iomem *regs;
>         struct sti_vtg_sync_params sync_params[VTG_MAX_SYNC_OUTPUT];
>         int irq;
>         u32 irq_status;
>         struct raw_notifier_head notifier_list;
>         struct drm_crtc *crtc;
> -       struct list_head link;
>  };
>
> -static void vtg_register(struct sti_vtg *vtg)
> -{
> -       list_add_tail(&vtg->link, &vtg_lookup);
> -}
> -
>  struct sti_vtg *of_vtg_find(struct device_node *np)
>  {
> -       struct sti_vtg *vtg;
> +       struct platform_device *pdev;
>
> -       list_for_each_entry(vtg, &vtg_lookup, link) {
> -               if (vtg->np == np)
> -                       return vtg;
> -       }
> -       return NULL;
> +       pdev = of_find_device_by_node(np);
> +       if (!pdev)
> +               return NULL;
> +
> +       return (struct sti_vtg *)platform_get_drvdata(pdev);
>  }
>
>  static void vtg_reset(struct sti_vtg *vtg)
> @@ -397,9 +385,6 @@ static int vtg_probe(struct platform_device *pdev)
>         if (!vtg)
>                 return -ENOMEM;
>
> -       vtg->dev = dev;
> -       vtg->np = pdev->dev.of_node;
> -
>         /* Get Memory ressources */
>         res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
>         if (!res) {
> @@ -428,10 +413,9 @@ static int vtg_probe(struct platform_device *pdev)
>                 return ret;
>         }
>
> -       vtg_register(vtg);
>         platform_set_drvdata(pdev, vtg);
>
> -       DRM_INFO("%s %s\n", __func__, dev_name(vtg->dev));
> +       DRM_INFO("%s %s\n", __func__, dev_name(dev));
>
>         return 0;
>  }
> --
> 2.7.4
>



-- 
Benjamin Gaignard

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