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Subject[PATCH v2 15/15] drm/mxsfb: Add support for live pixel format change
Date
This IP requires full stop and re-start when changing display timings,
but we can change the pixel format while running.

Signed-off-by: Robert Chiras <robert.chiras@nxp.com>
---
drivers/gpu/drm/mxsfb/mxsfb_crtc.c | 16 +++++++++++++++-
1 file changed, 15 insertions(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/mxsfb/mxsfb_crtc.c b/drivers/gpu/drm/mxsfb/mxsfb_crtc.c
index 317575e..5607fc0 100644
--- a/drivers/gpu/drm/mxsfb/mxsfb_crtc.c
+++ b/drivers/gpu/drm/mxsfb/mxsfb_crtc.c
@@ -494,6 +494,7 @@ void mxsfb_plane_atomic_update(struct mxsfb_drm_private *mxsfb,
struct drm_crtc *crtc = &pipe->crtc;
struct drm_plane_state *new_state = pipe->plane.state;
struct drm_framebuffer *fb = pipe->plane.state->fb;
+ struct drm_framebuffer *old_fb = state->fb;
struct drm_pending_vblank_event *event;
u32 fb_addr, src_off, src_w, stride, cpp = 0;

@@ -510,7 +511,7 @@ void mxsfb_plane_atomic_update(struct mxsfb_drm_private *mxsfb,
}
spin_unlock_irq(&crtc->dev->event_lock);

- if (!fb)
+ if (!fb || !old_fb)
return;

fb_addr = mxsfb_get_fb_paddr(mxsfb);
@@ -533,4 +534,17 @@ void mxsfb_plane_atomic_update(struct mxsfb_drm_private *mxsfb,
src_w = new_state->src_w >> 16;
mxsfb_set_fb_hcrop(mxsfb, src_w, stride);
}
+
+ if (old_fb->format->format != fb->format->format) {
+ struct drm_format_name_buf old_fmt_buf;
+ struct drm_format_name_buf new_fmt_buf;
+
+ DRM_DEV_DEBUG_DRIVER(crtc->dev->dev,
+ "Switching pixel format: %s -> %s\n",
+ drm_get_format_name(old_fb->format->format,
+ &old_fmt_buf),
+ drm_get_format_name(fb->format->format,
+ &new_fmt_buf));
+ mxsfb_set_pixel_fmt(mxsfb, true);
+ }
}
--
2.7.4
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