From mboxrd@z Thu Jan 1 00:00:00 1970 From: Magnus Damm Date: Tue, 17 Mar 2015 01:21:56 +0000 Subject: [PATCH] drm/rcar-du: Avoid restarting when shutting down Message-Id: <20150317012156.3466.18403.sendpatchset@little-apple> List-Id: MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit To: linux-sh@vger.kernel.org From: Magnus Damm This is a prototype patch that removes one DU restart operation from the shutdown sequence. With this in place both the required time for mode switching is reduced and so is the amount of flicker. Needs to be reworked to fit on top of atomic update support. Not-Yet-Signed-off-by: Magnus Damm --- drivers/gpu/drm/rcar-du/rcar_du_crtc.c | 11 ++++++++--- 1 file changed, 8 insertions(+), 3 deletions(-) --- 0001/drivers/gpu/drm/rcar-du/rcar_du_crtc.c +++ work/drivers/gpu/drm/rcar-du/rcar_du_crtc.c 2015-03-16 12:43:00.127684181 +0900 @@ -187,7 +187,7 @@ void rcar_du_crtc_route_output(struct dr rcdu->dpad0_source = rcrtc->index; } -void rcar_du_crtc_update_planes(struct drm_crtc *crtc) +static void __rcar_du_crtc_update_planes(struct drm_crtc *crtc, bool restart) { struct rcar_du_crtc *rcrtc = to_rcar_crtc(crtc); struct rcar_du_plane *planes[RCAR_DU_NUM_HW_PLANES]; @@ -247,7 +247,7 @@ void rcar_du_crtc_update_planes(struct d */ if (value != dptsr) { rcar_du_group_write(rcrtc->group, DPTSR, dptsr); - if (rcrtc->group->used_crtcs) + if (restart && rcrtc->group->used_crtcs) rcar_du_group_restart(rcrtc->group); } } @@ -256,6 +256,11 @@ void rcar_du_crtc_update_planes(struct d dspr); } +void rcar_du_crtc_update_planes(struct drm_crtc *crtc) +{ + __rcar_du_crtc_update_planes(crtc, true); +} + static void rcar_du_crtc_start(struct rcar_du_crtc *rcrtc) { struct drm_crtc *crtc = &rcrtc->crtc; @@ -314,7 +319,7 @@ static void rcar_du_crtc_stop(struct rca mutex_lock(&rcrtc->group->planes.lock); rcrtc->plane->enabled = false; - rcar_du_crtc_update_planes(crtc); + __rcar_du_crtc_update_planes(crtc, false); mutex_unlock(&rcrtc->group->planes.lock); /* Select switch sync mode. This stops display operation and configures