[PATCH v4 4/7] drm/fb-helper: Apply panel orientation connector prop to the primary plane

Hans de Goede
2017-10-23T09:24:59Z

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@redhat.com>
---
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

Changes in v4:
-Make drm_fb_helper_init() init drm_fb_helper_crtc.rotation to
DRM_MODE_ROTATE_0 for all crtcs, so that we do not end up setting the
plane_state's rotation to an invalid value for disabled crtcs
(caught by Fi.CI)
---
drivers/gpu/drm/drm_fb_helper.c | 77 +++++++++++++++++++++++++++++++++++++++--
include/drm/drm_fb_helper.h | 8 +++++
2 files changed, 83 insertions(+), 2 deletions(-)

diff --git a/drivers/gpu/drm/drm_fb_helper.c b/drivers/gpu/drm/drm_fb_helper.c
index 116d1f1337c7..b5d075fbd3a5 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)
@@ -821,6 +826,7 @@ int drm_fb_helper_init(struct drm_device *dev,
if (!fb_helper->crtc_info[i].mode_set.connectors)
goto out_free;
fb_helper->crtc_info[i].mode_set.num_connectors = 0;
+ fb_helper->crtc_info[i].rotation = DRM_MODE_ROTATE_0;
}

i = 0;
@@ -2334,6 +2340,57 @@ 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;
+ 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]);
+
+ 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;
+}
+
static void drm_setup_crtcs(struct drm_fb_helper *fb_helper,
u32 width, u32 height)
{
@@ -2393,6 +2450,7 @@ 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 +2470,7 @@ 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 +2512,20 @@ 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