Re: [PATCH] drm: Perform cmdline mode parsing during connector initialisation

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On Thu, 15 May 2014 10:54:36 +0100
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 move the cmdline parser earlier. If we
> perform the connector cmdline parsing as soon as we initialise the
> connector, that cmdline mode and forced status is then available even if
> the fbdev helper is not compiled in or never called.
> 
> We also then expose the cmdline user mode in the connector mode lists.
> 
> Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=73154
> 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         |   56 +++++++++++++++++++++++++++++++
>  drivers/gpu/drm/drm_fb_helper.c    |   64 ++----------------------------------
>  drivers/gpu/drm/drm_modes.c        |    1 +
>  drivers/gpu/drm/drm_probe_helper.c |   17 ++++++++++
>  drivers/gpu/drm/i915/intel_drv.h   |    5 ---
>  include/drm/drm_crtc.h             |    1 +
>  include/drm/drm_fb_helper.h        |    1 -
>  7 files changed, 78 insertions(+), 67 deletions(-)
> 
> diff --git a/drivers/gpu/drm/drm_crtc.c b/drivers/gpu/drm/drm_crtc.c
> index 461d19b..93c9198 100644
> --- a/drivers/gpu/drm/drm_crtc.c
> +++ b/drivers/gpu/drm/drm_crtc.c
> @@ -799,6 +799,60 @@ static void drm_mode_remove(struct drm_connector *connector,
>  }
>  
>  /**
> + * 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.
> + */
> +static void drm_connector_get_cmdline_mode(struct drm_connector *connector)
> +{
> +	struct drm_cmdline_mode *mode = &connector->cmdline_mode;
> +	char *option = NULL;
> +
> +	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" : "");
> +}
> +
> +/**
>   * drm_connector_init - Init a preallocated connector
>   * @dev: DRM device
>   * @connector: the connector to init
> @@ -842,6 +896,8 @@ int drm_connector_init(struct drm_device *dev,
>  	connector->edid_blob_ptr = NULL;
>  	connector->status = connector_status_unknown;
>  
> +	drm_connector_get_cmdline_mode(connector);
> +
>  	list_add_tail(&connector->head, &dev->mode_config.connector_list);
>  	dev->mode_config.num_connector++;
>  
> diff --git a/drivers/gpu/drm/drm_fb_helper.c b/drivers/gpu/drm/drm_fb_helper.c
> index e95ed58..c3b53f9 100644
> --- a/drivers/gpu/drm/drm_fb_helper.c
> +++ b/drivers/gpu/drm/drm_fb_helper.c
> @@ -105,60 +105,6 @@ fail:
>  }
>  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;
> -
> -		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" : "");
> -		}
> -
> -	}
> -	return 0;
> -}
> -
>  static void drm_fb_helper_save_lut_atomic(struct drm_crtc *crtc, struct drm_fb_helper *helper)
>  {
>  	uint16_t *r_base, *g_base, *b_base;
> @@ -910,7 +856,7 @@ static int drm_fb_helper_single_fb_probe(struct drm_fb_helper *fb_helper,
>  		struct drm_fb_helper_connector *fb_helper_conn = fb_helper->connector_info[i];
>  		struct drm_cmdline_mode *cmdline_mode;
>  
> -		cmdline_mode = &fb_helper_conn->cmdline_mode;
> +		cmdline_mode = &fb_helper_conn->connector->cmdline_mode;
>  
>  		if (cmdline_mode->bpp_specified) {
>  			switch (cmdline_mode->bpp) {
> @@ -1158,9 +1104,7 @@ EXPORT_SYMBOL(drm_has_preferred_mode);
>  
>  static bool drm_has_cmdline_mode(struct drm_fb_helper_connector *fb_connector)
>  {
> -	struct drm_cmdline_mode *cmdline_mode;
> -	cmdline_mode = &fb_connector->cmdline_mode;
> -	return cmdline_mode->specified;
> +	return fb_connector->connector->cmdline_mode.specified;
>  }
>  
>  struct drm_display_mode *drm_pick_cmdline_mode(struct drm_fb_helper_connector *fb_helper_conn,
> @@ -1170,7 +1114,7 @@ struct drm_display_mode *drm_pick_cmdline_mode(struct drm_fb_helper_connector *f
>  	struct drm_display_mode *mode = NULL;
>  	bool prefer_non_interlace;
>  
> -	cmdline_mode = &fb_helper_conn->cmdline_mode;
> +	cmdline_mode = &fb_helper_conn->connector->cmdline_mode;
>  	if (cmdline_mode->specified == false)
>  		return mode;
>  
> @@ -1555,8 +1499,6 @@ bool drm_fb_helper_initial_config(struct drm_fb_helper *fb_helper, int bpp_sel)
>  	struct drm_device *dev = fb_helper->dev;
>  	int count = 0;
>  
> -	drm_fb_helper_parse_command_line(fb_helper);
> -
>  	mutex_lock(&dev->mode_config.mutex);
>  	count = drm_fb_helper_probe_connector_modes(fb_helper,
>  						    dev->mode_config.max_width,
> diff --git a/drivers/gpu/drm/drm_modes.c b/drivers/gpu/drm/drm_modes.c
> index bedf189..d1b7d20 100644
> --- a/drivers/gpu/drm/drm_modes.c
> +++ b/drivers/gpu/drm/drm_modes.c
> @@ -1259,6 +1259,7 @@ drm_mode_create_from_cmdline_mode(struct drm_device *dev,
>  	if (!mode)
>  		return NULL;
>  
> +	mode->type |= DRM_MODE_TYPE_USERDEF;
>  	drm_mode_set_crtcinfo(mode, CRTC_INTERLACE_HALVE_V);
>  	return mode;
>  }
> diff --git a/drivers/gpu/drm/drm_probe_helper.c b/drivers/gpu/drm/drm_probe_helper.c
> index 79f07f2..006e3f9 100644
> --- a/drivers/gpu/drm/drm_probe_helper.c
> +++ b/drivers/gpu/drm/drm_probe_helper.c
> @@ -82,6 +82,22 @@ static void drm_mode_validate_flag(struct drm_connector *connector,
>  	return;
>  }
>  
> +static int drm_helper_probe_add_cmdline_mode(struct drm_connector *connector)
> +{
> +	struct drm_display_mode *mode;
> +
> +	if (!connector->cmdline_mode.specified)
> +		return 0;
> +
> +	mode = drm_mode_create_from_cmdline_mode(connector->dev,
> +						 &connector->cmdline_mode);
> +	if (mode == NULL)
> +		return 0;
> +
> +	drm_mode_probed_add(connector, mode);
> +	return 1;
> +}
> +
>  static int drm_helper_probe_single_connector_modes_merge_bits(struct drm_connector *connector,
>  							      uint32_t maxX, uint32_t maxY, bool merge_type_bits)
>  {
> @@ -134,6 +150,7 @@ static int drm_helper_probe_single_connector_modes_merge_bits(struct drm_connect
>  
>  	if (count == 0 && connector->status == connector_status_connected)
>  		count = drm_add_modes_noedid(connector, 1024, 768);
> +	count += drm_helper_probe_add_cmdline_mode(connector);
>  	if (count == 0)
>  		goto prune;
>  
> diff --git a/drivers/gpu/drm/i915/intel_drv.h b/drivers/gpu/drm/i915/intel_drv.h
> index 32a74e1..f38f941 100644
> --- a/drivers/gpu/drm/i915/intel_drv.h
> +++ b/drivers/gpu/drm/i915/intel_drv.h
> @@ -828,7 +828,6 @@ void intel_dvo_init(struct drm_device *dev);
>  /* legacy fbdev emulation in intel_fbdev.c */
>  #ifdef CONFIG_DRM_I915_FBDEV
>  extern int intel_fbdev_init(struct drm_device *dev);
> -extern void intel_fbdev_initial_config(struct drm_device *dev);
>  extern void intel_fbdev_fini(struct drm_device *dev);
>  extern void intel_fbdev_set_suspend(struct drm_device *dev, int state);
>  extern void intel_fbdev_output_poll_changed(struct drm_device *dev);
> @@ -839,10 +838,6 @@ static inline int intel_fbdev_init(struct drm_device *dev)
>  	return 0;
>  }
>  
> -static inline void intel_fbdev_initial_config(struct drm_device *dev)
> -{
> -}
> -
>  static inline void intel_fbdev_fini(struct drm_device *dev)
>  {
>  }
> diff --git a/include/drm/drm_crtc.h b/include/drm/drm_crtc.h
> index c061bb3..4dde1fb 100644
> --- a/include/drm/drm_crtc.h
> +++ b/include/drm/drm_crtc.h
> @@ -508,6 +508,7 @@ struct drm_connector {
>  	void *helper_private;
>  
>  	/* forced on connector */
> +	struct drm_cmdline_mode cmdline_mode;
>  	enum drm_connector_force force;
>  	uint32_t encoder_ids[DRM_CONNECTOR_MAX_ENCODER];
>  	struct drm_encoder *encoder; /* currently active encoder */
> diff --git a/include/drm/drm_fb_helper.h b/include/drm/drm_fb_helper.h
> index 6e622f7..a8ae1b9 100644
> --- a/include/drm/drm_fb_helper.h
> +++ b/include/drm/drm_fb_helper.h
> @@ -77,7 +77,6 @@ struct drm_fb_helper_funcs {
>  
>  struct drm_fb_helper_connector {
>  	struct drm_connector *connector;
> -	struct drm_cmdline_mode cmdline_mode;
>  };
>  
>  struct drm_fb_helper {

Looks ok... it mixes together things that could be in separate patches
(like the userdef fix), but overall I think it's an improvement.

Reviewed-by: Jesse Barnes <jbarnes@xxxxxxxxxxxxxxxx>

-- 
Jesse Barnes, Intel Open Source Technology Center
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