The driver resets the pixelvalve FIFO in a number of occurences without always using the same sequence.
Since this will be critical for BCM2711, let's move that sequence to a function so that we are consistent.
Reviewed-by: Eric Anholt eric@anholt.net Signed-off-by: Maxime Ripard maxime@cerno.tech --- drivers/gpu/drm/vc4/vc4_crtc.c | 20 +++++++++++++------- 1 file changed, 13 insertions(+), 7 deletions(-)
diff --git a/drivers/gpu/drm/vc4/vc4_crtc.c b/drivers/gpu/drm/vc4/vc4_crtc.c index 41bc61d5a61f..c2ab907611e3 100644 --- a/drivers/gpu/drm/vc4/vc4_crtc.c +++ b/drivers/gpu/drm/vc4/vc4_crtc.c @@ -267,6 +267,15 @@ static struct drm_encoder *vc4_get_crtc_encoder(struct drm_crtc *crtc) return NULL; }
+static void vc4_crtc_pixelvalve_reset(struct drm_crtc *crtc) +{ + struct vc4_crtc *vc4_crtc = to_vc4_crtc(crtc); + + /* The PV needs to be disabled before it can be flushed */ + CRTC_WRITE(PV_CONTROL, CRTC_READ(PV_CONTROL) & ~PV_CONTROL_EN); + CRTC_WRITE(PV_CONTROL, CRTC_READ(PV_CONTROL) | PV_CONTROL_FIFO_CLR); +} + static void vc4_crtc_config_pv(struct drm_crtc *crtc) { struct drm_encoder *encoder = vc4_get_crtc_encoder(crtc); @@ -282,10 +291,7 @@ static void vc4_crtc_config_pv(struct drm_crtc *crtc) u32 format = is_dsi ? PV_CONTROL_FORMAT_DSIV_24 : PV_CONTROL_FORMAT_24; u8 ppc = pv_data->pixels_per_clock;
- /* Reset the PV fifo. */ - CRTC_WRITE(PV_CONTROL, 0); - CRTC_WRITE(PV_CONTROL, PV_CONTROL_FIFO_CLR | PV_CONTROL_EN); - CRTC_WRITE(PV_CONTROL, 0); + vc4_crtc_pixelvalve_reset(crtc);
CRTC_WRITE(PV_HORZA, VC4_SET_FIELD((mode->htotal - mode->hsync_end) * pixel_rep / ppc, @@ -430,9 +436,9 @@ static void vc4_crtc_atomic_enable(struct drm_crtc *crtc,
require_hvs_enabled(dev);
- /* Reset the PV fifo. */ - CRTC_WRITE(PV_CONTROL, CRTC_READ(PV_CONTROL) | - PV_CONTROL_FIFO_CLR | PV_CONTROL_EN); + vc4_crtc_pixelvalve_reset(crtc); + + CRTC_WRITE(PV_CONTROL, CRTC_READ(PV_CONTROL) | PV_CONTROL_EN);
/* Enable vblank irq handling before crtc is started otherwise * drm_crtc_get_vblank() fails in vc4_crtc_update_dlist().