Re: [PATCH v2] drm/exynos: let drm handle edid allocations

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2013/1/2 Rahul Sharma <rahul.sharma@xxxxxxxxxxx>:
> There's no need to allocate edid twice and do a memcpy when drm helpers
> exist to do just that. This patch cleans that interaction up, and
> doesn't keep the edid hanging around in the connector.
>
> v2:
> - changed vidi_get_edid callback inside vidi driver.
>
> Signed-off-by: Sean Paul <seanpaul@xxxxxxxxxxxx>
> Signed-off-by: Rahul Sharma <rahul.sharma@xxxxxxxxxxx>
> Signed-off-by: Seung-Woo Kim <sw0312.kim@xxxxxxxxxxx>
> ---
> This patch is based on branch "exynos-drm-next" at
> http://git.kernel.org/?p=linux/kernel/git/daeinki/drm-exynos.git
>
>  drivers/gpu/drm/exynos/exynos_drm_connector.c | 36 ++++++++++++++-------------
>  drivers/gpu/drm/exynos/exynos_drm_drv.h       |  4 +--
>  drivers/gpu/drm/exynos/exynos_drm_hdmi.c      |  9 +++----
>  drivers/gpu/drm/exynos/exynos_drm_hdmi.h      |  4 +--
>  drivers/gpu/drm/exynos/exynos_drm_vidi.c      | 19 +++++++++-----
>  drivers/gpu/drm/exynos/exynos_hdmi.c          | 25 ++++++++-----------
>  6 files changed, 50 insertions(+), 47 deletions(-)
>
> diff --git a/drivers/gpu/drm/exynos/exynos_drm_connector.c b/drivers/gpu/drm/exynos/exynos_drm_connector.c
> index ab37437..7ee43aa 100644
> --- a/drivers/gpu/drm/exynos/exynos_drm_connector.c
> +++ b/drivers/gpu/drm/exynos/exynos_drm_connector.c
> @@ -96,7 +96,9 @@ static int exynos_drm_connector_get_modes(struct drm_connector *connector)
>                                         to_exynos_connector(connector);
>         struct exynos_drm_manager *manager = exynos_connector->manager;
>         struct exynos_drm_display_ops *display_ops = manager->display_ops;
> -       unsigned int count;
> +       unsigned int count = 0;
> +       struct edid *edid = NULL;
> +       int ret;
>
>         DRM_DEBUG_KMS("%s\n", __FILE__);
>
> @@ -114,27 +116,25 @@ static int exynos_drm_connector_get_modes(struct drm_connector *connector)
>          * because lcd panel has only one mode.
>          */
>         if (display_ops->get_edid) {
> -               int ret;
> -               void *edid;
> -
> -               edid = kzalloc(MAX_EDID, GFP_KERNEL);
> -               if (!edid) {
> -                       DRM_ERROR("failed to allocate edid\n");
> -                       return 0;
> +               edid = display_ops->get_edid(manager->dev, connector);
> +               if (IS_ERR_OR_NULL(edid)) {
> +                       ret = PTR_ERR(edid);
> +                       edid = NULL;
> +                       DRM_ERROR("Panel operation get_edid failed %d\n", ret);
> +                       goto out;
>                 }
>
> -               ret = display_ops->get_edid(manager->dev, connector,
> -                                               edid, MAX_EDID);

MAX_EDID definition isn't used anymore. Please remove it.

> -               if (ret < 0) {
> -                       DRM_ERROR("failed to get edid data.\n");
> -                       kfree(edid);
> -                       edid = NULL;
> -                       return 0;
> +               ret = drm_mode_connector_update_edid_property(connector, edid);
> +               if (ret) {
> +                       DRM_ERROR("update edid property failed(%d)\n", ret);
> +                       goto out;
>                 }
>
> -               drm_mode_connector_update_edid_property(connector, edid);
>                 count = drm_add_edid_modes(connector, edid);
> -               kfree(edid);
> +               if (count < 0) {
> +                       DRM_ERROR("Add edid modes failed %d\n", count);
> +                       goto out;
> +               }
>         } else {
>                 struct exynos_drm_panel_info *panel;
>                 struct drm_display_mode *mode = drm_mode_create(connector->dev);
> @@ -161,6 +161,8 @@ static int exynos_drm_connector_get_modes(struct drm_connector *connector)
>                 count = 1;
>         }
>
> +out:
> +       kfree(edid);
>         return count;
>  }
>
> diff --git a/drivers/gpu/drm/exynos/exynos_drm_drv.h b/drivers/gpu/drm/exynos/exynos_drm_drv.h
> index b9e51bc..4606fac 100644
> --- a/drivers/gpu/drm/exynos/exynos_drm_drv.h
> +++ b/drivers/gpu/drm/exynos/exynos_drm_drv.h
> @@ -148,8 +148,8 @@ struct exynos_drm_overlay {
>  struct exynos_drm_display_ops {
>         enum exynos_drm_output_type type;
>         bool (*is_connected)(struct device *dev);
> -       int (*get_edid)(struct device *dev, struct drm_connector *connector,
> -                               u8 *edid, int len);
> +       struct edid *(*get_edid)(struct device *dev,
> +                       struct drm_connector *connector);
>         void *(*get_panel)(struct device *dev);
>         int (*check_timing)(struct device *dev, void *timing);
>         int (*power_on)(struct device *dev, int mode);
> diff --git a/drivers/gpu/drm/exynos/exynos_drm_hdmi.c b/drivers/gpu/drm/exynos/exynos_drm_hdmi.c
> index 55793c4..a17d752 100644
> --- a/drivers/gpu/drm/exynos/exynos_drm_hdmi.c
> +++ b/drivers/gpu/drm/exynos/exynos_drm_hdmi.c
> @@ -108,18 +108,17 @@ static bool drm_hdmi_is_connected(struct device *dev)
>         return false;
>  }
>
> -static int drm_hdmi_get_edid(struct device *dev,
> -               struct drm_connector *connector, u8 *edid, int len)
> +struct edid *drm_hdmi_get_edid(struct device *dev,
> +                       struct drm_connector *connector)
>  {
>         struct drm_hdmi_context *ctx = to_context(dev);
>
>         DRM_DEBUG_KMS("%s\n", __FILE__);
>
>         if (hdmi_ops && hdmi_ops->get_edid)
> -               return hdmi_ops->get_edid(ctx->hdmi_ctx->ctx, connector, edid,
> -                                         len);
> +               return hdmi_ops->get_edid(ctx->hdmi_ctx->ctx, connector);
>
> -       return 0;
> +       return NULL;
>  }
>
>  static int drm_hdmi_check_timing(struct device *dev, void *timing)
> diff --git a/drivers/gpu/drm/exynos/exynos_drm_hdmi.h b/drivers/gpu/drm/exynos/exynos_drm_hdmi.h
> index 784a7e9..d80516f 100644
> --- a/drivers/gpu/drm/exynos/exynos_drm_hdmi.h
> +++ b/drivers/gpu/drm/exynos/exynos_drm_hdmi.h
> @@ -30,8 +30,8 @@ struct exynos_drm_hdmi_context {
>  struct exynos_hdmi_ops {
>         /* display */
>         bool (*is_connected)(void *ctx);
> -       int (*get_edid)(void *ctx, struct drm_connector *connector,
> -                       u8 *edid, int len);
> +       struct edid *(*get_edid)(void *ctx,
> +                       struct drm_connector *connector);
>         int (*check_timing)(void *ctx, void *timing);
>         int (*power_on)(void *ctx, int mode);
>
> diff --git a/drivers/gpu/drm/exynos/exynos_drm_vidi.c b/drivers/gpu/drm/exynos/exynos_drm_vidi.c
> index 99bfc38..3260035 100644
> --- a/drivers/gpu/drm/exynos/exynos_drm_vidi.c
> +++ b/drivers/gpu/drm/exynos/exynos_drm_vidi.c
> @@ -98,10 +98,12 @@ static bool vidi_display_is_connected(struct device *dev)
>         return ctx->connected ? true : false;
>  }
>
> -static int vidi_get_edid(struct device *dev, struct drm_connector *connector,
> -                               u8 *edid, int len)
> +static struct edid *vidi_get_edid(struct device *dev,
> +                       struct drm_connector *connector)
>  {
>         struct vidi_context *ctx = get_vidi_context(dev);
> +       struct edid *edid;
> +       int edid_len;
>
>         DRM_DEBUG_KMS("%s\n", __FILE__);
>
> @@ -111,13 +113,18 @@ static int vidi_get_edid(struct device *dev, struct drm_connector *connector,
>          */
>         if (!ctx->raw_edid) {
>                 DRM_DEBUG_KMS("raw_edid is null.\n");
> -               return -EFAULT;
> +               return ERR_PTR(-EFAULT);
>         }
>
> -       memcpy(edid, ctx->raw_edid, min((1 + ctx->raw_edid->extensions)
> -                                       * EDID_LENGTH, len));
> +       edid_len = (1 + ctx->raw_edid->extensions) * EDID_LENGTH;
> +       edid = kzalloc(edid_len, GFP_KERNEL);
> +       if (!edid) {
> +               DRM_DEBUG_KMS("failed to allocate edid\n");
> +               return ERR_PTR(-ENOMEM);
> +       }
>
> -       return 0;
> +       memcpy(edid, ctx->raw_edid, edid_len);
> +       return edid;
>  }
>
>  static void *vidi_get_panel(struct device *dev)
> diff --git a/drivers/gpu/drm/exynos/exynos_hdmi.c b/drivers/gpu/drm/exynos/exynos_hdmi.c
> index 2c46b6c..36e9214 100644
> --- a/drivers/gpu/drm/exynos/exynos_hdmi.c
> +++ b/drivers/gpu/drm/exynos/exynos_hdmi.c
> @@ -1391,8 +1391,7 @@ static bool hdmi_is_connected(void *ctx)
>         return hdata->hpd;
>  }
>
> -static int hdmi_get_edid(void *ctx, struct drm_connector *connector,
> -                               u8 *edid, int len)
> +static struct edid *hdmi_get_edid(void *ctx, struct drm_connector *connector)
>  {
>         struct edid *raw_edid;
>         struct hdmi_context *hdata = ctx;
> @@ -1400,22 +1399,18 @@ static int hdmi_get_edid(void *ctx, struct drm_connector *connector,
>         DRM_DEBUG_KMS("[%d] %s\n", __LINE__, __func__);
>
>         if (!hdata->ddc_port)
> -               return -ENODEV;
> +               return ERR_PTR(-ENODEV);
>
>         raw_edid = drm_get_edid(connector, hdata->ddc_port->adapter);
> -       if (raw_edid) {
> -               hdata->dvi_mode = !drm_detect_hdmi_monitor(raw_edid);
> -               memcpy(edid, raw_edid, min((1 + raw_edid->extensions)
> -                                       * EDID_LENGTH, len));
> -               DRM_DEBUG_KMS("%s : width[%d] x height[%d]\n",
> -                       (hdata->dvi_mode ? "dvi monitor" : "hdmi monitor"),
> -                       raw_edid->width_cm, raw_edid->height_cm);
> -               kfree(raw_edid);
> -       } else {
> -               return -ENODEV;
> -       }
> +       if (!raw_edid)
> +               return ERR_PTR(-ENODEV);
>
> -       return 0;
> +       hdata->dvi_mode = !drm_detect_hdmi_monitor(raw_edid);
> +       DRM_DEBUG_KMS("%s : width[%d] x height[%d]\n",
> +               (hdata->dvi_mode ? "dvi monitor" : "hdmi monitor"),
> +               raw_edid->width_cm, raw_edid->height_cm);
> +
> +       return raw_edid;
>  }
>
>  static int hdmi_v13_check_timing(struct fb_videomode *check_timing)
> --
> 1.8.0
>
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