Re: [Intel-gfx] [PATCH v3 4/7] drm/fb-helper: Apply panel orientation connector prop to the primary plane

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On Mon, Oct 23, 2017 at 09:14:22AM +0200, Hans de Goede wrote:
> Apply the "panel orientation" drm connector prop to the primary plane so
> that fbcon and fbdev using userspace programs display the right way up.
> 
> Fixes: https://bugs.freedesktop.org/show_bug.cgi?id=94894
> Signed-off-by: Hans de Goede <hdegoede@xxxxxxxxxx>
> ---
> Changes in v2:
> -New patch in v2 of this patch-set
> 
> Changes in v3:
> -Use a rotation member in struct drm_fb_helper_crtc and set that from
>  drm_setup_crtcs instead of looping over all crtc's to find the right one
>  later
> -Since we now no longer look at rotation quirks directly in the fbcon code,
>  set fb_info.fbcon_rotate_hint when the panel is not mounted upright and
>  we cannot use hardware rotation
> ---
>  drivers/gpu/drm/drm_fb_helper.c | 76 +++++++++++++++++++++++++++++++++++++++--
>  include/drm/drm_fb_helper.h     |  8 +++++
>  2 files changed, 82 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/gpu/drm/drm_fb_helper.c b/drivers/gpu/drm/drm_fb_helper.c
> index 116d1f1337c7..e0f95f2cc52f 100644
> --- a/drivers/gpu/drm/drm_fb_helper.c
> +++ b/drivers/gpu/drm/drm_fb_helper.c
> @@ -41,6 +41,7 @@
>  #include <drm/drm_atomic.h>
>  #include <drm/drm_atomic_helper.h>
>  
> +#include "drm_crtc_internal.h"
>  #include "drm_crtc_helper_internal.h"
>  
>  static bool drm_fbdev_emulation = true;
> @@ -350,6 +351,7 @@ EXPORT_SYMBOL(drm_fb_helper_debug_leave);
>  static int restore_fbdev_mode_atomic(struct drm_fb_helper *fb_helper, bool active)
>  {
>  	struct drm_device *dev = fb_helper->dev;
> +	struct drm_plane_state *plane_state;
>  	struct drm_plane *plane;
>  	struct drm_atomic_state *state;
>  	int i, ret;
> @@ -368,8 +370,6 @@ static int restore_fbdev_mode_atomic(struct drm_fb_helper *fb_helper, bool activ
>  retry:
>  	plane_mask = 0;
>  	drm_for_each_plane(plane, dev) {
> -		struct drm_plane_state *plane_state;
> -
>  		plane_state = drm_atomic_get_plane_state(state, plane);
>  		if (IS_ERR(plane_state)) {
>  			ret = PTR_ERR(plane_state);
> @@ -392,6 +392,11 @@ static int restore_fbdev_mode_atomic(struct drm_fb_helper *fb_helper, bool activ
>  
>  	for (i = 0; i < fb_helper->crtc_count; i++) {
>  		struct drm_mode_set *mode_set = &fb_helper->crtc_info[i].mode_set;
> +		struct drm_plane *primary = mode_set->crtc->primary;
> +
> +		/* Cannot fail as we've already gotten the plane state above */
> +		plane_state = drm_atomic_get_new_plane_state(state, primary);
> +		plane_state->rotation = fb_helper->crtc_info[i].rotation;
>  
>  		ret = __drm_atomic_helper_set_config(mode_set, state);
>  		if (ret != 0)
> @@ -2334,6 +2339,57 @@ static int drm_pick_crtcs(struct drm_fb_helper *fb_helper,
>  	return best_score;
>  }
>  
> +/*
> + * This function checks if rotation is necessary because of panel orientation
> + * and if it is, if it is supported.
> + * If rotation is necessary and supported, its gets set in fb_crtc.rotation.
> + * If rotation is necessary but not supported, a DRM_MODE_ROTATE_* flag gets
> + * or-ed into fb_helper->rotations. In drm_setup_crtcs_fb() we check if only
> + * one bit is set and then we set fb_info.fbcon_rotate_hint to make fbcon do
> + * the unsupported rotation.
> + */
> +static void drm_setup_crtc_rotation(struct drm_fb_helper *fb_helper,
> +				    struct drm_fb_helper_crtc *fb_crtc,
> +				    struct drm_connector *connector)
> +{
> +	struct drm_plane *plane = fb_crtc->mode_set.crtc->primary;
> +	uint64_t valid_mask = 0;
> +	int i, rotation;
> +
> +	fb_crtc->rotation = DRM_MODE_ROTATE_0;
> +
> +	switch (connector->display_info.panel_orientation) {
> +	case DRM_MODE_PANEL_ORIENTATION_BOTTOM_UP:
> +		rotation = DRM_MODE_ROTATE_180;
> +		break;
> +	case DRM_MODE_PANEL_ORIENTATION_LEFT_UP:
> +		rotation = DRM_MODE_ROTATE_90;
> +		break;
> +	case DRM_MODE_PANEL_ORIENTATION_RIGHT_UP:
> +		rotation = DRM_MODE_ROTATE_270;
> +		break;

For 90/270 hw rotation you need to flip the coordinates/sizes of the fb.

> +	default:
> +		rotation = DRM_MODE_ROTATE_0;
> +	}
> +
> +	if (rotation == DRM_MODE_ROTATE_0 || !plane->rotation_property) {
> +		fb_helper->rotations |= rotation;
> +		return;
> +	}
> +
> +	for (i = 0; i < plane->rotation_property->num_values; i++)
> +		valid_mask |= (1ULL << plane->rotation_property->values[i]);

This isn't a good enough check for atomic drivers (and not for gen9+ intel
hw), since we might expose 90° rotations, but it only works if you have
the correct tiling format.

For atomic drivers it'd be really good if we could do a TEST_ONLY commit
first, and if that fails, fall back to sw rotation.

But that poses a bit a chicken&egg with creating the framebuffer (we need
one for the TEST_ONLY), so probably a bit too much more for this. And
afaiui your quirk list only applies to older stuff.

At least add a FIXME meanwhile? In a way we have a FIXME already for
multi-pipe, since we don't try to fall back to fewer pipes if the single
atomic commit failed.

Or maybe just don't use 90/270 hw rotation for now since it seems buggy in
your code anyway.

> +
> +	if (!(rotation & valid_mask)) {
> +		fb_helper->rotations |= rotation;
> +		return;
> +	}
> +
> +	fb_crtc->rotation = rotation;
> +	/* Rotating in hardware, fbcon should not rotate */
> +	fb_helper->rotations |= DRM_MODE_ROTATE_0;

Wrong bitopt I think.

Or you're doing some really funny control logic by oring in another value
to hit the default case below which doesn't rotate anything. I think that
should be done explicitly, by explicitly setting to rotation to ROTATE_0
instead of this. Same for the check above.

> +}
> +
>  static void drm_setup_crtcs(struct drm_fb_helper *fb_helper,
>  			    u32 width, u32 height)
>  {
> @@ -2393,6 +2449,7 @@ static void drm_setup_crtcs(struct drm_fb_helper *fb_helper,
>  		drm_fb_helper_modeset_release(fb_helper,
>  					      &fb_helper->crtc_info[i].mode_set);
>  
> +	fb_helper->rotations = 0;
>  	drm_fb_helper_for_each_connector(fb_helper, i) {
>  		struct drm_display_mode *mode = modes[i];
>  		struct drm_fb_helper_crtc *fb_crtc = crtcs[i];
> @@ -2412,6 +2469,7 @@ static void drm_setup_crtcs(struct drm_fb_helper *fb_helper,
>  			modeset->mode = drm_mode_duplicate(dev,
>  							   fb_crtc->desired_mode);
>  			drm_connector_get(connector);
> +			drm_setup_crtc_rotation(fb_helper, fb_crtc, connector);
>  			modeset->connectors[modeset->num_connectors++] = connector;
>  			modeset->x = offset->x;
>  			modeset->y = offset->y;
> @@ -2453,6 +2511,20 @@ static void drm_setup_crtcs_fb(struct drm_fb_helper *fb_helper)
>  		}
>  	}
>  	mutex_unlock(&fb_helper->dev->mode_config.mutex);
> +
> +	switch (fb_helper->rotations) {
> +	case DRM_MODE_ROTATE_90:
> +		info->fbcon_rotate_hint = FB_ROTATE_CCW;
> +		break;
> +	case DRM_MODE_ROTATE_180:
> +		info->fbcon_rotate_hint = FB_ROTATE_UD;
> +		break;
> +	case DRM_MODE_ROTATE_270:
> +		info->fbcon_rotate_hint = FB_ROTATE_CW;
> +		break;
> +	default:
> +		info->fbcon_rotate_hint = FB_ROTATE_UR;
> +	}
>  }
>  
>  /* Note: Drops fb_helper->lock before returning. */
> diff --git a/include/drm/drm_fb_helper.h b/include/drm/drm_fb_helper.h
> index 33fe95927742..4ee834a077a2 100644
> --- a/include/drm/drm_fb_helper.h
> +++ b/include/drm/drm_fb_helper.h
> @@ -48,6 +48,7 @@ struct drm_fb_helper_crtc {
>  	struct drm_mode_set mode_set;
>  	struct drm_display_mode *desired_mode;
>  	int x, y;
> +	int rotation;
>  };
>  
>  /**
> @@ -158,6 +159,13 @@ struct drm_fb_helper {
>  	struct drm_fb_helper_crtc *crtc_info;
>  	int connector_count;
>  	int connector_info_alloc_count;
> +	/**
> +	 * @rotations:
> +	 * Bitmask of all rotations requested for panel-orientation which
> +	 * could not be handled in hardware. If only one bit is set
> +	 * fbdev->fbcon_rotate_hint gets set to the requested rotation.
> +	 */
> +	int rotations;
>  	/**
>  	 * @connector_info:
>  	 *
> -- 
> 2.14.2
> 
> _______________________________________________
> Intel-gfx mailing list
> Intel-gfx@xxxxxxxxxxxxxxxxxxxxx
> https://lists.freedesktop.org/mailman/listinfo/intel-gfx

-- 
Daniel Vetter
Software Engineer, Intel Corporation
http://blog.ffwll.ch
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