Re: [Intel-gfx] [PATCH] drm,drm/i915: Export cmdline mode parsing

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On Tue, 13 May 2014, Chris Wilson <chris@xxxxxxxxxxxxxxxxxx> wrote:
> i915.ko has a custom fbdev initialisation routine that aims to preserve
> the current mode set by the BIOS, unless overruled by the user. The
> user's wishes are determined by what, if any, mode is specified on the
> command line (via the video= parameter). However, that command line mode
> is first parsed by drm_fb_helper_initial_config() which is called after
> i915.ko's custom initial_config() as a fallback method. So in order for
> us to honour it, we need to export the routine out of the helper and
> call it first.

Is this an answer to https://bugs.freedesktop.org/show_bug.cgi?id=73154?

Jani.


>
> Signed-off-by: Chris Wilson <chris@xxxxxxxxxxxxxxxxxx>
> Cc: Jesse Barnes <jbarnes@xxxxxxxxxxxxxxxx>
> Cc: Ville Syrjälä <ville.syrjala@xxxxxxxxxxxxxxx>
> Cc: Daniel Vetter <daniel.vetter@xxxxxxxx>
> ---
>  drivers/gpu/drm/drm_crtc.c         | 58 ++++++++++++++++++++++++++++++++++++++
>  drivers/gpu/drm/drm_fb_helper.c    | 47 +++---------------------------
>  drivers/gpu/drm/i915/intel_fbdev.c |  2 ++
>  include/drm/drm_crtc.h             |  3 +-
>  4 files changed, 66 insertions(+), 44 deletions(-)
>
> diff --git a/drivers/gpu/drm/drm_crtc.c b/drivers/gpu/drm/drm_crtc.c
> index 656788a9bf4b..853804277921 100644
> --- a/drivers/gpu/drm/drm_crtc.c
> +++ b/drivers/gpu/drm/drm_crtc.c
> @@ -852,6 +852,64 @@ int drm_connector_init(struct drm_device *dev,
>  EXPORT_SYMBOL(drm_connector_init);
>  
>  /**
> + * drm_connector_get_cmdline_mode - reads the user's cmdline mode
> + * @connector: connector to quwery
> + * @mode: returned mode
> + *
> + * The kernel supports per-connector configration of its consoles through
> + * use of the video= parameter. This function parses that option and
> + * extracts the user's specified mode (or enable/disable status) for a
> + * particular connector. This is typically only used during the early fbdev
> + * setup.
> + */
> +void drm_connector_get_cmdline_mode(struct drm_connector *connector,
> +				    struct drm_cmdline_mode *mode)
> +{
> +	char *option = NULL;
> +
> +	if (mode->specified)
> +		return;
> +
> +	if (fb_get_options(drm_get_connector_name(connector), &option))
> +		return;
> +
> +	if (!drm_mode_parse_command_line_for_connector(option,
> +						       connector,
> +						       mode))
> +		return;
> +
> +	if (mode->force) {
> +		const char *s;
> +
> +		switch (mode->force) {
> +		case DRM_FORCE_OFF:
> +			s = "OFF";
> +			break;
> +		case DRM_FORCE_ON_DIGITAL:
> +			s = "ON - dig";
> +			break;
> +		default:
> +		case DRM_FORCE_ON:
> +			s = "ON";
> +			break;
> +		}
> +
> +		DRM_INFO("forcing %s connector %s\n",
> +			 drm_get_connector_name(connector), s);
> +		connector->force = mode->force;
> +	}
> +
> +	DRM_DEBUG_KMS("cmdline mode for connector %s %dx%d@%dHz%s%s%s\n",
> +		      drm_get_connector_name(connector),
> +		      mode->xres, mode->yres,
> +		      mode->refresh_specified ? mode->refresh : 60,
> +		      mode->rb ? " reduced blanking" : "",
> +		      mode->margins ? " with margins" : "",
> +		      mode->interlace ?  " interlaced" : "");
> +}
> +EXPORT_SYMBOL(drm_connector_get_cmdline_mode);
> +
> +/**
>   * drm_connector_cleanup - cleans up an initialised connector
>   * @connector: connector to cleanup
>   *
> diff --git a/drivers/gpu/drm/drm_fb_helper.c b/drivers/gpu/drm/drm_fb_helper.c
> index e95ed5805f07..f61a6c02101c 100644
> --- a/drivers/gpu/drm/drm_fb_helper.c
> +++ b/drivers/gpu/drm/drm_fb_helper.c
> @@ -107,55 +107,16 @@ EXPORT_SYMBOL(drm_fb_helper_single_add_all_connectors);
>  
>  static int drm_fb_helper_parse_command_line(struct drm_fb_helper *fb_helper)
>  {
> -	struct drm_fb_helper_connector *fb_helper_conn;
>  	int i;
>  
>  	for (i = 0; i < fb_helper->connector_count; i++) {
> -		struct drm_cmdline_mode *mode;
> -		struct drm_connector *connector;
> -		char *option = NULL;
> +		struct drm_fb_helper_connector *fb_helper_conn;
>  
>  		fb_helper_conn = fb_helper->connector_info[i];
> -		connector = fb_helper_conn->connector;
> -		mode = &fb_helper_conn->cmdline_mode;
> -
> -		/* do something on return - turn off connector maybe */
> -		if (fb_get_options(drm_get_connector_name(connector), &option))
> -			continue;
> -
> -		if (drm_mode_parse_command_line_for_connector(option,
> -							      connector,
> -							      mode)) {
> -			if (mode->force) {
> -				const char *s;
> -				switch (mode->force) {
> -				case DRM_FORCE_OFF:
> -					s = "OFF";
> -					break;
> -				case DRM_FORCE_ON_DIGITAL:
> -					s = "ON - dig";
> -					break;
> -				default:
> -				case DRM_FORCE_ON:
> -					s = "ON";
> -					break;
> -				}
> -
> -				DRM_INFO("forcing %s connector %s\n",
> -					 drm_get_connector_name(connector), s);
> -				connector->force = mode->force;
> -			}
> -
> -			DRM_DEBUG_KMS("cmdline mode for connector %s %dx%d@%dHz%s%s%s\n",
> -				      drm_get_connector_name(connector),
> -				      mode->xres, mode->yres,
> -				      mode->refresh_specified ? mode->refresh : 60,
> -				      mode->rb ? " reduced blanking" : "",
> -				      mode->margins ? " with margins" : "",
> -				      mode->interlace ?  " interlaced" : "");
> -		}
> -
> +		drm_connector_get_cmdline_mode(fb_helper_conn->connector,
> +					       &fb_helper_conn->cmdline_mode);
>  	}
> +
>  	return 0;
>  }
>  
> diff --git a/drivers/gpu/drm/i915/intel_fbdev.c b/drivers/gpu/drm/i915/intel_fbdev.c
> index d8f5b0f1357c..d22bfe4dc9f3 100644
> --- a/drivers/gpu/drm/i915/intel_fbdev.c
> +++ b/drivers/gpu/drm/i915/intel_fbdev.c
> @@ -349,6 +349,8 @@ static bool intel_fb_initial_config(struct drm_fb_helper *fb_helper,
>  			continue;
>  		}
>  
> +		drm_connector_get_cmdline_mode(connector, &fb_conn->cmdline_mode);
> +
>  		if (connector->force == DRM_FORCE_OFF) {
>  			DRM_DEBUG_KMS("connector %s is disabled by user, skipping\n",
>  				      drm_get_connector_name(connector));
> diff --git a/include/drm/drm_crtc.h b/include/drm/drm_crtc.h
> index d6026788a15d..1409669e6d2c 100644
> --- a/include/drm/drm_crtc.h
> +++ b/include/drm/drm_crtc.h
> @@ -856,7 +856,8 @@ extern int drm_connector_init(struct drm_device *dev,
>  			      struct drm_connector *connector,
>  			      const struct drm_connector_funcs *funcs,
>  			      int connector_type);
> -
> +extern void drm_connector_get_cmdline_mode(struct drm_connector *connector,
> +					   struct drm_cmdline_mode *mode);
>  extern void drm_connector_cleanup(struct drm_connector *connector);
>  /* helper to unplug all connectors from sysfs for device */
>  extern void drm_connector_unplug_all(struct drm_device *dev);
> -- 
> 2.0.0.rc2
>
> _______________________________________________
> Intel-gfx mailing list
> Intel-gfx@xxxxxxxxxxxxxxxxxxxxx
> http://lists.freedesktop.org/mailman/listinfo/intel-gfx

-- 
Jani Nikula, Intel Open Source Technology Center
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