[PATCH v3 05/10] drm: rcar-du: Handle CRTC standby from commit tail handler
Ulrich Hecht
uli at fpond.eu
Tue Jun 18 13:03:16 UTC 2019
> On June 17, 2019 at 11:09 PM Laurent Pinchart <laurent.pinchart+renesas at ideasonboard.com> wrote:
>
>
> From: Kieran Bingham <kieran.bingham+renesas at ideasonboard.com>
>
> Manage the power state, and initial configuration of the CRTC from the
> commit tail handler. CRTCs which need to be activated are taken out of
> standby, and any deactivated CRTCs are put into standby.
>
> This aims at removing CRTC state tracking from the rcar_du_crtc
> structure. The initial configuration of the CRTC background colours and
> disabling of all planes is taken out of rcar_du_crtc_setup() and moved
> inline into rcar_du_crtc_enable(). rcar_du_crtc_get() and
> rcar_du_crtc_put() are kept as they are needed to configure the VSP at
> the correct time, this will be addressed in a separate change.
>
> Signed-off-by: Kieran Bingham <kieran.bingham+renesas at ideasonboard.com>
> Signed-off-by: Laurent Pinchart <laurent.pinchart+renesas at ideasonboard.com>
> ---
> Changes since v2:
>
> - Add more documentation
> - Keep rcar_du_crtc_get() and rcar_du_crtc_put()
> - Renamed rcar_du_crtc_enable() to rcar_du_crtc_exit_standby() and
> rcar_du_crtc_disable() to rcar_du_crtc_enter_standby()
> - Reword commit message
>
> Changes since v1:
>
> - Registers sequence confirmed unchanged
> - Re-ordered in the series to handle before groups
> - Do not merge rcar_du_crtc_setup() (now handled by _crtc_pre_commit)
> ---
> drivers/gpu/drm/rcar-du/rcar_du_crtc.c | 90 ++++++++++++++++++++------
> drivers/gpu/drm/rcar-du/rcar_du_crtc.h | 5 ++
> drivers/gpu/drm/rcar-du/rcar_du_kms.c | 4 ++
> 3 files changed, 81 insertions(+), 18 deletions(-)
>
> diff --git a/drivers/gpu/drm/rcar-du/rcar_du_crtc.c b/drivers/gpu/drm/rcar-du/rcar_du_crtc.c
> index cccd6fe85749..23f4bdef0e3a 100644
> --- a/drivers/gpu/drm/rcar-du/rcar_du_crtc.c
> +++ b/drivers/gpu/drm/rcar-du/rcar_du_crtc.c
> @@ -480,17 +480,10 @@ static void rcar_du_crtc_wait_page_flip(struct rcar_du_crtc *rcrtc)
>
> static void rcar_du_crtc_setup(struct rcar_du_crtc *rcrtc)
> {
> - /* Set display off and background to black */
> - rcar_du_crtc_write(rcrtc, DOOR, DOOR_RGB(0, 0, 0));
> - rcar_du_crtc_write(rcrtc, BPOR, BPOR_RGB(0, 0, 0));
> -
> /* Configure display timings and output routing */
> rcar_du_crtc_set_display_timing(rcrtc);
> rcar_du_group_set_routing(rcrtc->group);
>
> - /* Start with all planes disabled. */
> - rcar_du_group_write(rcrtc->group, rcrtc->index % 2 ? DS2PR : DS1PR, 0);
> -
> /* Enable the VSP compositor. */
> if (rcar_du_has(rcrtc->dev, RCAR_DU_FEATURE_VSP1_SOURCE)) {
> rcar_du_vsp_modeset(rcrtc);
> @@ -501,17 +494,10 @@ static void rcar_du_crtc_setup(struct rcar_du_crtc *rcrtc)
> drm_crtc_vblank_on(&rcrtc->crtc);
> }
>
> -static int rcar_du_crtc_get(struct rcar_du_crtc *rcrtc)
> +static int rcar_du_crtc_exit_standby(struct rcar_du_crtc *rcrtc)
> {
> int ret;
>
> - /*
> - * Guard against double-get, as the function is called from both the
> - * .atomic_enable() and .atomic_begin() handlers.
> - */
> - if (rcrtc->initialized)
> - return 0;
> -
> ret = clk_prepare_enable(rcrtc->clock);
> if (ret < 0)
> return ret;
> @@ -524,8 +510,12 @@ static int rcar_du_crtc_get(struct rcar_du_crtc *rcrtc)
> if (ret < 0)
> goto error_group;
>
> - rcar_du_crtc_setup(rcrtc);
> - rcrtc->initialized = true;
> + /* Set display off and background to black. */
> + rcar_du_crtc_write(rcrtc, DOOR, DOOR_RGB(0, 0, 0));
> + rcar_du_crtc_write(rcrtc, BPOR, BPOR_RGB(0, 0, 0));
> +
> + /* Start with all planes disabled. */
> + rcar_du_group_write(rcrtc->group, rcrtc->index % 2 ? DS2PR : DS1PR, 0);
>
> return 0;
>
> @@ -536,13 +526,29 @@ static int rcar_du_crtc_get(struct rcar_du_crtc *rcrtc)
> return ret;
> }
>
> -static void rcar_du_crtc_put(struct rcar_du_crtc *rcrtc)
> +static void rcar_du_crtc_enter_standby(struct rcar_du_crtc *rcrtc)
> {
> rcar_du_group_put(rcrtc->group);
>
> clk_disable_unprepare(rcrtc->extclock);
> clk_disable_unprepare(rcrtc->clock);
> +}
>
> +static void rcar_du_crtc_get(struct rcar_du_crtc *rcrtc)
> +{
> + /*
> + * Guard against double-get, as the function is called from both the
> + * .atomic_enable() and .atomic_begin() handlers.
> + */
> + if (rcrtc->initialized)
> + return;
> +
> + rcar_du_crtc_setup(rcrtc);
> + rcrtc->initialized = true;
> +}
> +
> +static void rcar_du_crtc_put(struct rcar_du_crtc *rcrtc)
> +{
> rcrtc->initialized = false;
> }
>
> @@ -662,6 +668,54 @@ static int rcar_du_crtc_atomic_check(struct drm_crtc *crtc,
> return 0;
> }
>
> +/*
> + * Take all CRTCs that are made active in this commit out of standby.
> + * CRTCs that are deactivated by the commit are untouched and will be
> + * put in standby by rcar_du_crtc_atomic_enter_standby().
> + */
> +int rcar_du_crtc_atomic_exit_standby(struct drm_device *dev,
> + struct drm_atomic_state *state)
> +{
> + struct drm_crtc_state *crtc_state;
> + struct drm_crtc *crtc;
> + unsigned int i;
> + int ret;
> +
> + for_each_new_crtc_in_state(state, crtc, crtc_state, i) {
> + struct rcar_du_crtc *rcrtc = to_rcar_crtc(crtc);
> +
> + if (crtc_state->active_changed && crtc_state->active) {
> + ret = rcar_du_crtc_exit_standby(rcrtc);
> + if (ret)
> + return ret;
> + }
> + }
> +
> + return 0;
> +}
> +
> +/*
> + * Put all CRTCs that have been deactivated by this commit in standby.
> + * This shall be called at the end of the commit tail handler as the
> + * last operation that touches the CRTC hardware.
> + */
> +int rcar_du_crtc_atomic_enter_standby(struct drm_device *dev,
> + struct drm_atomic_state *state)
> +{
> + struct drm_crtc_state *crtc_state;
> + struct drm_crtc *crtc;
> + unsigned int i;
> +
> + for_each_new_crtc_in_state(state, crtc, crtc_state, i) {
> + struct rcar_du_crtc *rcrtc = to_rcar_crtc(crtc);
> +
> + if (crtc_state->active_changed && !crtc_state->active)
> + rcar_du_crtc_enter_standby(rcrtc);
> + }
> +
> + return 0;
> +}
> +
> static void rcar_du_crtc_atomic_enable(struct drm_crtc *crtc,
> struct drm_crtc_state *old_state)
> {
> diff --git a/drivers/gpu/drm/rcar-du/rcar_du_crtc.h b/drivers/gpu/drm/rcar-du/rcar_du_crtc.h
> index 3b7fc668996f..3ce7610793b2 100644
> --- a/drivers/gpu/drm/rcar-du/rcar_du_crtc.h
> +++ b/drivers/gpu/drm/rcar-du/rcar_du_crtc.h
> @@ -107,6 +107,11 @@ int rcar_du_crtc_create(struct rcar_du_group *rgrp, unsigned int swindex,
>
> void rcar_du_crtc_finish_page_flip(struct rcar_du_crtc *rcrtc);
>
> +int rcar_du_crtc_atomic_exit_standby(struct drm_device *dev,
> + struct drm_atomic_state *state);
> +int rcar_du_crtc_atomic_enter_standby(struct drm_device *dev,
> + struct drm_atomic_state *state);
> +
> void rcar_du_crtc_dsysr_clr_set(struct rcar_du_crtc *rcrtc, u32 clr, u32 set);
>
> #endif /* __RCAR_DU_CRTC_H__ */
> diff --git a/drivers/gpu/drm/rcar-du/rcar_du_kms.c b/drivers/gpu/drm/rcar-du/rcar_du_kms.c
> index 2dc9caee8767..59680de271cc 100644
> --- a/drivers/gpu/drm/rcar-du/rcar_du_kms.c
> +++ b/drivers/gpu/drm/rcar-du/rcar_du_kms.c
> @@ -409,11 +409,15 @@ static void rcar_du_atomic_commit_tail(struct drm_atomic_state *old_state)
> }
>
> /* Apply the atomic update. */
> + rcar_du_crtc_atomic_exit_standby(dev, old_state);
> +
> drm_atomic_helper_commit_modeset_disables(dev, old_state);
> drm_atomic_helper_commit_planes(dev, old_state,
> DRM_PLANE_COMMIT_ACTIVE_ONLY);
> drm_atomic_helper_commit_modeset_enables(dev, old_state);
>
> + rcar_du_crtc_atomic_enter_standby(dev, old_state);
> +
> drm_atomic_helper_commit_hw_done(old_state);
> drm_atomic_helper_wait_for_flip_done(dev, old_state);
>
> --
> Regards,
>
> Laurent Pinchart
>
Reviewed-by: Ulrich Hecht <uli+renesas at fpond.eu>
CU
Uli
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