redonkable/alistair23-linux
redonkable/alistair23-linux
1
0
Fork 0
Code Releases Activity

drm: rcar-du: Perform the initial CRTC setup from rcar_du_crtc_get()

Browse source 
The rcar_du_crtc_get() function is always immediately followed by a call
to rcar_du_crtc_setup(). Call the later from the former to simplify the
code, and add a comment to explain how the get and put calls are
balanced.

Signed-off-by: Laurent Pinchart <laurent.pinchart+renesas@ideasonboard.com>
Tested-by: Jacopo Mondi <jacopo+renesas@jmondi.org>
Reviewed-by: Jacopo Mondi <jacopo+renesas@jmondi.org>
This commit is contained in:
Laurent Pinchart 2017-07-14 03:26:17 +03:00
parent c25c013611
commit 0bb63534fd
1 changed files with 56 additions and 51 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

107
drivers/gpu/drm/rcar-du/rcar_du_crtc.c
View file

@ -66,39 +66,6 @@ static void rcar_du_crtc_clr_set(struct rcar_du_crtc *rcrtc, u32 reg,
rcar_du_write(rcdu, rcrtc->mmio_offset + reg, (value & ~clr) | set);
}
static int rcar_du_crtc_get(struct rcar_du_crtc *rcrtc)
{
int ret;
ret = clk_prepare_enable(rcrtc->clock);
if (ret < 0)
return ret;
ret = clk_prepare_enable(rcrtc->extclock);
if (ret < 0)
goto error_clock;
ret = rcar_du_group_get(rcrtc->group);
if (ret < 0)
goto error_group;
return 0;
error_group:
clk_disable_unprepare(rcrtc->extclock);
error_clock:
clk_disable_unprepare(rcrtc->clock);
return ret;
}
static void rcar_du_crtc_put(struct rcar_du_crtc *rcrtc)
{
rcar_du_group_put(rcrtc->group);
clk_disable_unprepare(rcrtc->extclock);
clk_disable_unprepare(rcrtc->clock);
}
/* -----------------------------------------------------------------------------
* Hardware Setup
*/
@ -546,6 +513,51 @@ 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)
{
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;
ret = clk_prepare_enable(rcrtc->extclock);
if (ret < 0)
goto error_clock;
ret = rcar_du_group_get(rcrtc->group);
if (ret < 0)
goto error_group;
rcar_du_crtc_setup(rcrtc);
rcrtc->initialized = true;
return 0;
error_group:
clk_disable_unprepare(rcrtc->extclock);
error_clock:
clk_disable_unprepare(rcrtc->clock);
return ret;
}
static void rcar_du_crtc_put(struct rcar_du_crtc *rcrtc)
{
rcar_du_group_put(rcrtc->group);
clk_disable_unprepare(rcrtc->extclock);
clk_disable_unprepare(rcrtc->clock);
rcrtc->initialized = false;
}
static void rcar_du_crtc_start(struct rcar_du_crtc *rcrtc)
{
bool interlaced;
@ -639,16 +651,7 @@ static void rcar_du_crtc_atomic_enable(struct drm_crtc *crtc,
{
struct rcar_du_crtc *rcrtc = to_rcar_crtc(crtc);
/*
* If the CRTC has already been setup by the .atomic_begin() handler we
* can skip the setup stage.
*/
if (!rcrtc->initialized) {
rcar_du_crtc_get(rcrtc);
rcar_du_crtc_setup(rcrtc);
rcrtc->initialized = true;
}
rcar_du_crtc_get(rcrtc);
rcar_du_crtc_start(rcrtc);
}
@ -667,7 +670,6 @@ static void rcar_du_crtc_atomic_disable(struct drm_crtc *crtc,
}
spin_unlock_irq(&crtc->dev->event_lock);
rcrtc->initialized = false;
rcrtc->outputs = 0;
}
@ -680,14 +682,17 @@ static void rcar_du_crtc_atomic_begin(struct drm_crtc *crtc,
/*
* If a mode set is in progress we can be called with the CRTC disabled.
* We then need to first setup the CRTC in order to configure planes.
* The .atomic_enable() handler will notice and skip the CRTC setup.
* We thus need to first get and setup the CRTC in order to configure
* planes. We must *not* put the CRTC in .atomic_flush(), as it must be
* kept awake until the .atomic_enable() call that will follow. The get
* operation in .atomic_enable() will in that case be a no-op, and the
* CRTC will be put later in .atomic_disable().
*
* If a mode set is not in progress the CRTC is enabled, and the
* following get call will be a no-op. There is thus no need to belance
* it in .atomic_flush() either.
*/
if (!rcrtc->initialized) {
rcar_du_crtc_get(rcrtc);
rcar_du_crtc_setup(rcrtc);
rcrtc->initialized = true;
}
rcar_du_crtc_get(rcrtc);
if (rcar_du_has(rcrtc->group->dev, RCAR_DU_FEATURE_VSP1_SOURCE))
rcar_du_vsp_atomic_begin(rcrtc);