The old implementation of placing planes on the CRTC while configuring the planes was naive and relied on the order in which the planes were configured, enabled, and disabled. The situation where a plane's zpos was changed on the fly was completely broken. The usual symptoms of this problem was scrambled display and a flood of sync lost errors, when a plane was active in two layers at the same time, or a missing plane, in case when a layer was accidentally disabled.
The rewrite takes a more straight forward approach when HW is concerned. The plane positioning registers are in the CRTC (actually OVR) register space and it is more natural to configure them in one go while configuring the CRTC. To do this we need to make sure we have all the planes on updated CRTCs in the new atomic state to be committed. This is done by calling drm_atomic_add_affected_planes() in crtc_atomic_check().
Signed-off-by: Jyri Sarha jsarha@ti.com --- drivers/gpu/drm/tidss/tidss_crtc.c | 55 ++++++++++++++++++++++++++++- drivers/gpu/drm/tidss/tidss_dispc.c | 55 +++++++++++------------------ drivers/gpu/drm/tidss/tidss_dispc.h | 5 +++ 3 files changed, 79 insertions(+), 36 deletions(-)
diff --git a/drivers/gpu/drm/tidss/tidss_crtc.c b/drivers/gpu/drm/tidss/tidss_crtc.c index 032c31ee2820..f7c5fd1094a8 100644 --- a/drivers/gpu/drm/tidss/tidss_crtc.c +++ b/drivers/gpu/drm/tidss/tidss_crtc.c @@ -17,6 +17,7 @@ #include "tidss_dispc.h" #include "tidss_drv.h" #include "tidss_irq.h" +#include "tidss_plane.h"
/* Page flip and frame done IRQs */
@@ -93,6 +94,7 @@ static int tidss_crtc_atomic_check(struct drm_crtc *crtc, u32 hw_videoport = tcrtc->hw_videoport; const struct drm_display_mode *mode; enum drm_mode_status ok; + int ret;
dev_dbg(ddev->dev, "%s\n", __func__);
@@ -108,7 +110,54 @@ static int tidss_crtc_atomic_check(struct drm_crtc *crtc, return -EINVAL; }
- return dispc_vp_bus_check(dispc, hw_videoport, state); + ret = dispc_vp_bus_check(dispc, hw_videoport, state); + if (ret) + return ret; + + /* Add unchanged planes on this crtc to state for zpos update. */ + return drm_atomic_add_affected_planes(state->state, crtc); +} + +static void tidss_crtc_position_planes(struct tidss_device *tidss, + struct drm_crtc *crtc, + struct drm_crtc_state *old_state, + bool newmodeset) +{ + struct drm_atomic_state *ostate = old_state->state; + struct tidss_crtc *tcrtc = to_tidss_crtc(crtc); + struct drm_crtc_state *cstate = crtc->state; + int zpos; + + if (!newmodeset && !cstate->zpos_changed && !cstate->planes_changed) + return; + + for (zpos = 0; zpos < tidss->feat->num_planes; zpos++) { + struct drm_plane_state *pstate; + struct drm_plane *plane; + bool zpos_taken = false; + int i; + + for_each_new_plane_in_state(ostate, plane, pstate, i) { + if (pstate->crtc != crtc || !pstate->visible) + continue; + + if (pstate->normalized_zpos == zpos) { + zpos_taken = true; + break; + } + } + + if (zpos_taken) { + struct tidss_plane *tplane = to_tidss_plane(plane); + + dispc_ovr_set_plane(tidss->dispc, tplane->hw_plane_id, + tcrtc->hw_videoport, + pstate->crtc_x, pstate->crtc_y, + zpos); + } + dispc_ovr_enable_layer(tidss->dispc, tcrtc->hw_videoport, zpos, + zpos_taken); + } }
static void tidss_crtc_atomic_flush(struct drm_crtc *crtc, @@ -146,6 +195,9 @@ static void tidss_crtc_atomic_flush(struct drm_crtc *crtc, /* Write vp properties to HW if needed. */ dispc_vp_setup(tidss->dispc, tcrtc->hw_videoport, crtc->state, false);
+ /* Update plane positions if needed. */ + tidss_crtc_position_planes(tidss, crtc, old_crtc_state, false); + WARN_ON(drm_crtc_vblank_get(crtc) != 0);
spin_lock_irqsave(&ddev->event_lock, flags); @@ -183,6 +235,7 @@ static void tidss_crtc_atomic_enable(struct drm_crtc *crtc, return;
dispc_vp_setup(tidss->dispc, tcrtc->hw_videoport, crtc->state, true); + tidss_crtc_position_planes(tidss, crtc, old_state, true);
/* Turn vertical blanking interrupt reporting on. */ drm_crtc_vblank_on(crtc); diff --git a/drivers/gpu/drm/tidss/tidss_dispc.c b/drivers/gpu/drm/tidss/tidss_dispc.c index eeb160dc047b..e79dad246b1e 100644 --- a/drivers/gpu/drm/tidss/tidss_dispc.c +++ b/drivers/gpu/drm/tidss/tidss_dispc.c @@ -281,11 +281,6 @@ struct dss_vp_data { u32 *gamma_table; };
-struct dss_plane_data { - u32 zorder; - u32 hw_videoport; -}; - struct dispc_device { struct tidss_device *tidss; struct device *dev; @@ -307,8 +302,6 @@ struct dispc_device {
struct dss_vp_data vp_data[TIDSS_MAX_PORTS];
- struct dss_plane_data plane_data[TIDSS_MAX_PLANES]; - u32 *fourccs; u32 num_fourccs;
@@ -1247,7 +1240,7 @@ int dispc_vp_set_clk_rate(struct dispc_device *dispc, u32 hw_videoport, /* OVR */ static void dispc_k2g_ovr_set_plane(struct dispc_device *dispc, u32 hw_plane, u32 hw_videoport, - u32 x, u32 y, u32 zpos) + u32 x, u32 y, u32 layer) { /* On k2g there is only one plane and no need for ovr */ dispc_vid_write(dispc, hw_plane, DISPC_VID_K2G_POSITION, @@ -1256,44 +1249,43 @@ static void dispc_k2g_ovr_set_plane(struct dispc_device *dispc,
static void dispc_am65x_ovr_set_plane(struct dispc_device *dispc, u32 hw_plane, u32 hw_videoport, - u32 x, u32 y, u32 zpos) + u32 x, u32 y, u32 layer) { - OVR_REG_FLD_MOD(dispc, hw_videoport, DISPC_OVR_ATTRIBUTES(zpos), + OVR_REG_FLD_MOD(dispc, hw_videoport, DISPC_OVR_ATTRIBUTES(layer), hw_plane, 4, 1); - OVR_REG_FLD_MOD(dispc, hw_videoport, DISPC_OVR_ATTRIBUTES(zpos), + OVR_REG_FLD_MOD(dispc, hw_videoport, DISPC_OVR_ATTRIBUTES(layer), x, 17, 6); - OVR_REG_FLD_MOD(dispc, hw_videoport, DISPC_OVR_ATTRIBUTES(zpos), + OVR_REG_FLD_MOD(dispc, hw_videoport, DISPC_OVR_ATTRIBUTES(layer), y, 30, 19); }
static void dispc_j721e_ovr_set_plane(struct dispc_device *dispc, u32 hw_plane, u32 hw_videoport, - u32 x, u32 y, u32 zpos) + u32 x, u32 y, u32 layer) { - OVR_REG_FLD_MOD(dispc, hw_videoport, DISPC_OVR_ATTRIBUTES(zpos), + OVR_REG_FLD_MOD(dispc, hw_videoport, DISPC_OVR_ATTRIBUTES(layer), hw_plane, 4, 1); - OVR_REG_FLD_MOD(dispc, hw_videoport, DISPC_OVR_ATTRIBUTES2(zpos), + OVR_REG_FLD_MOD(dispc, hw_videoport, DISPC_OVR_ATTRIBUTES2(layer), x, 13, 0); - OVR_REG_FLD_MOD(dispc, hw_videoport, DISPC_OVR_ATTRIBUTES2(zpos), + OVR_REG_FLD_MOD(dispc, hw_videoport, DISPC_OVR_ATTRIBUTES2(layer), y, 29, 16); }
-static void dispc_ovr_set_plane(struct dispc_device *dispc, - u32 hw_plane, u32 hw_videoport, - u32 x, u32 y, u32 zpos) +void dispc_ovr_set_plane(struct dispc_device *dispc, u32 hw_plane, + u32 hw_videoport, u32 x, u32 y, u32 layer) { switch (dispc->feat->subrev) { case DISPC_K2G: dispc_k2g_ovr_set_plane(dispc, hw_plane, hw_videoport, - x, y, zpos); + x, y, layer); break; case DISPC_AM65X: dispc_am65x_ovr_set_plane(dispc, hw_plane, hw_videoport, - x, y, zpos); + x, y, layer); break; case DISPC_J721E: dispc_j721e_ovr_set_plane(dispc, hw_plane, hw_videoport, - x, y, zpos); + x, y, layer); break; default: WARN_ON(1); @@ -1301,10 +1293,13 @@ static void dispc_ovr_set_plane(struct dispc_device *dispc, } }
-static void dispc_ovr_enable_plane(struct dispc_device *dispc, - u32 hw_videoport, u32 zpos, bool enable) +void dispc_ovr_enable_layer(struct dispc_device *dispc, + u32 hw_videoport, u32 layer, bool enable) { - OVR_REG_FLD_MOD(dispc, hw_videoport, DISPC_OVR_ATTRIBUTES(zpos), + if (dispc->feat->subrev == DISPC_K2G) + return; + + OVR_REG_FLD_MOD(dispc, hw_videoport, DISPC_OVR_ATTRIBUTES(layer), !!enable, 0, 0); }
@@ -2070,21 +2065,11 @@ int dispc_plane_setup(struct dispc_device *dispc, u32 hw_plane, VID_REG_FLD_MOD(dispc, hw_plane, DISPC_VID_ATTRIBUTES, 0, 28, 28);
- dispc_ovr_set_plane(dispc, hw_plane, hw_videoport, - state->crtc_x, state->crtc_y, - state->normalized_zpos); - - dispc->plane_data[hw_plane].zorder = state->normalized_zpos; - dispc->plane_data[hw_plane].hw_videoport = hw_videoport; - return 0; }
int dispc_plane_enable(struct dispc_device *dispc, u32 hw_plane, bool enable) { - dispc_ovr_enable_plane(dispc, dispc->plane_data[hw_plane].hw_videoport, - dispc->plane_data[hw_plane].zorder, enable); - VID_REG_FLD_MOD(dispc, hw_plane, DISPC_VID_ATTRIBUTES, !!enable, 0, 0);
return 0; diff --git a/drivers/gpu/drm/tidss/tidss_dispc.h b/drivers/gpu/drm/tidss/tidss_dispc.h index e65e6a2bb821..a4a68249e44b 100644 --- a/drivers/gpu/drm/tidss/tidss_dispc.h +++ b/drivers/gpu/drm/tidss/tidss_dispc.h @@ -94,6 +94,11 @@ extern const struct dispc_features dispc_j721e_feats; void dispc_set_irqenable(struct dispc_device *dispc, dispc_irq_t mask); dispc_irq_t dispc_read_and_clear_irqstatus(struct dispc_device *dispc);
+void dispc_ovr_set_plane(struct dispc_device *dispc, u32 hw_plane, + u32 hw_videoport, u32 x, u32 y, u32 layer); +void dispc_ovr_enable_layer(struct dispc_device *dispc, + u32 hw_videoport, u32 layer, bool enable); + void dispc_vp_prepare(struct dispc_device *dispc, u32 hw_videoport, const struct drm_crtc_state *state); void dispc_vp_enable(struct dispc_device *dispc, u32 hw_videoport,