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drm: Clean-up VBLANK-related callbacks in struct drm_driver 

All non-legacy users of VBLANK functions in struct drm_driver have been
converted to use the respective interfaces in struct drm_crtc_funcs. The
remaining users of VBLANK callbacks in struct drm_driver are legacy drivers
with userspace modesetting.

All users of struct drm_driver.get_scanout_position() have been
converted to the respective CRTC helper function. Remove the callback
from struct drm_driver.

There are no users left of get_vblank_timestamp(), so the callback is
being removed. The other VBLANK callbacks are being moved to the legacy
section at the end of struct drm_driver.

Also removed is drm_calc_vbltimestamp_from_scanoutpos(). Callers of this
function have been converted to use the CRTC instead.

v4:
	* more readable code for setting high_prec (Ville, Jani)
v2:
	* merge with removal of struct drm_driver.get_scanout_position()
	* remove drm_calc_vbltimestamp_from_scanoutpos()

Signed-off-by: Thomas Zimmermann <tzimmermann@suse.de>
Reviewed-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Tested-by: Yannick Fertré <yannick.fertre@st.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20200123135943.24140-22-tzimmermann@suse.de
This commit is contained in:
Thomas Zimmermann 2020-01-23 14:59:42 +01:00
Родитель 4bebe91adb
Коммит f397d66b31
3 изменённых файлов: 12 добавлений и 226 удалений
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81
drivers/gpu/drm/drm_vblank.c
Просмотреть файл

@ -144,10 +144,9 @@ static u32 __get_vblank_counter(struct drm_device *dev, unsigned int pipe)
if (crtc->funcs->get_vblank_counter)
return crtc->funcs->get_vblank_counter(crtc);
}
if (dev->driver->get_vblank_counter)
} else if (dev->driver->get_vblank_counter) {
return dev->driver->get_vblank_counter(dev, pipe);
}
return drm_vblank_no_hw_counter(dev, pipe);
}
@ -340,8 +339,7 @@ u64 drm_crtc_accurate_vblank_count(struct drm_crtc *crtc)
unsigned long flags;
WARN_ONCE(drm_debug_enabled(DRM_UT_VBL) &&
!crtc->funcs->get_vblank_timestamp &&
!dev->driver->get_vblank_timestamp,
!crtc->funcs->get_vblank_timestamp,
"This function requires support for accurate vblank timestamps.");
spin_lock_irqsave(&dev->vblank_time_lock, flags);
@ -363,13 +361,11 @@ static void __disable_vblank(struct drm_device *dev, unsigned int pipe)
if (WARN_ON(!crtc))
return;
if (crtc->funcs->disable_vblank) {
if (crtc->funcs->disable_vblank)
crtc->funcs->disable_vblank(crtc);
return;
}
}
} else {
dev->driver->disable_vblank(dev, pipe);
}
}
/*
@ -593,62 +589,6 @@ void drm_calc_timestamping_constants(struct drm_crtc *crtc,
}
EXPORT_SYMBOL(drm_calc_timestamping_constants);
/**
* drm_calc_vbltimestamp_from_scanoutpos - precise vblank timestamp helper
* @dev: DRM device
* @pipe: index of CRTC whose vblank timestamp to retrieve
* @max_error: Desired maximum allowable error in timestamps (nanosecs)
* On return contains true maximum error of timestamp
* @vblank_time: Pointer to time which should receive the timestamp
* @in_vblank_irq:
* True when called from drm_crtc_handle_vblank(). Some drivers
* need to apply some workarounds for gpu-specific vblank irq quirks
* if flag is set.
*
* Implements calculation of exact vblank timestamps from given drm_display_mode
* timings and current video scanout position of a CRTC. This can be directly
* used as the &drm_crtc_funcs.get_vblank_timestamp implementation of a kms
* driver if &drm_crtc_helper_funcs.get_scanout_position or
* &drm_driver.get_scanout_position is implemented.
*
* The current implementation only handles standard video modes. For double scan
* and interlaced modes the driver is supposed to adjust the hardware mode
* (taken from &drm_crtc_state.adjusted mode for atomic modeset drivers) to
* match the scanout position reported.
*
* Note that atomic drivers must call drm_calc_timestamping_constants() before
* enabling a CRTC. The atomic helpers already take care of that in
* drm_atomic_helper_update_legacy_modeset_state().
*
* Returns:
*
* Returns true on success, and false on failure, i.e. when no accurate
* timestamp could be acquired.
*/
bool drm_calc_vbltimestamp_from_scanoutpos(struct drm_device *dev,
unsigned int pipe,
int *max_error,
ktime_t *vblank_time,
bool in_vblank_irq)
{
struct drm_crtc *crtc;
if (!drm_core_check_feature(dev, DRIVER_MODESET))
return false;
crtc = drm_crtc_from_index(dev, pipe);
if (!crtc)
return false;
return drm_crtc_vblank_helper_get_vblank_timestamp_internal(crtc,
max_error,
vblank_time,
in_vblank_irq,
crtc->helper_private->get_scanout_position,
dev->driver->get_scanout_position);
}
EXPORT_SYMBOL(drm_calc_vbltimestamp_from_scanoutpos);
/**
* drm_crtc_vblank_helper_get_vblank_timestamp_internal - precise vblank
* timestamp helper
@ -884,9 +824,6 @@ drm_get_last_vbltimestamp(struct drm_device *dev, unsigned int pipe,
ret = crtc->funcs->get_vblank_timestamp(crtc, &max_error,
tvblank, in_vblank_irq);
} else if (dev->driver->get_vblank_timestamp && max_error > 0) {
ret = dev->driver->get_vblank_timestamp(dev, pipe, &max_error,
tvblank, in_vblank_irq);
}
/* GPU high precision timestamp query unsupported or failed.
@ -1109,9 +1046,11 @@ static int __enable_vblank(struct drm_device *dev, unsigned int pipe)
if (crtc->funcs->enable_vblank)
return crtc->funcs->enable_vblank(crtc);
} else if (dev->driver->enable_vblank) {
return dev->driver->enable_vblank(dev, pipe);
}
return dev->driver->enable_vblank(dev, pipe);
return -EINVAL;
}
static int drm_vblank_enable(struct drm_device *dev, unsigned int pipe)
@ -1896,8 +1835,6 @@ static void drm_handle_vblank_events(struct drm_device *dev, unsigned int pipe)
if (crtc && crtc->funcs->get_vblank_timestamp)
high_prec = true;
else if (dev->driver->get_vblank_timestamp)
high_prec = true;
trace_drm_vblank_event(pipe, seq, now, high_prec);
}

153
include/drm/drm_drv.h
Просмотреть файл

@ -268,156 +268,6 @@ struct drm_driver {
*/
void (*release) (struct drm_device *);
/**
* @get_vblank_counter:
*
* Driver callback for fetching a raw hardware vblank counter for the
* CRTC specified with the pipe argument. If a device doesn't have a
* hardware counter, the driver can simply leave the hook as NULL.
* The DRM core will account for missed vblank events while interrupts
* where disabled based on system timestamps.
*
* Wraparound handling and loss of events due to modesetting is dealt
* with in the DRM core code, as long as drivers call
* drm_crtc_vblank_off() and drm_crtc_vblank_on() when disabling or
* enabling a CRTC.
*
* This is deprecated and should not be used by new drivers.
* Use &drm_crtc_funcs.get_vblank_counter instead.
*
* Returns:
*
* Raw vblank counter value.
*/
u32 (*get_vblank_counter) (struct drm_device *dev, unsigned int pipe);
/**
* @enable_vblank:
*
* Enable vblank interrupts for the CRTC specified with the pipe
* argument.
*
* This is deprecated and should not be used by new drivers.
* Use &drm_crtc_funcs.enable_vblank instead.
*
* Returns:
*
* Zero on success, appropriate errno if the given @crtc's vblank
* interrupt cannot be enabled.
*/
int (*enable_vblank) (struct drm_device *dev, unsigned int pipe);
/**
* @disable_vblank:
*
* Disable vblank interrupts for the CRTC specified with the pipe
* argument.
*
* This is deprecated and should not be used by new drivers.
* Use &drm_crtc_funcs.disable_vblank instead.
*/
void (*disable_vblank) (struct drm_device *dev, unsigned int pipe);
/**
* @get_scanout_position:
*
* Called by vblank timestamping code.
*
* Returns the current display scanout position from a crtc, and an
* optional accurate ktime_get() timestamp of when position was
* measured. Note that this is a helper callback which is only used if a
* driver uses drm_calc_vbltimestamp_from_scanoutpos() for the
* @get_vblank_timestamp callback.
*
* Parameters:
*
* dev:
* DRM device.
* pipe:
* Id of the crtc to query.
* in_vblank_irq:
* True when called from drm_crtc_handle_vblank(). Some drivers
* need to apply some workarounds for gpu-specific vblank irq quirks
* if flag is set.
* vpos:
* Target location for current vertical scanout position.
* hpos:
* Target location for current horizontal scanout position.
* stime:
* Target location for timestamp taken immediately before
* scanout position query. Can be NULL to skip timestamp.
* etime:
* Target location for timestamp taken immediately after
* scanout position query. Can be NULL to skip timestamp.
* mode:
* Current display timings.
*
* Returns vpos as a positive number while in active scanout area.
* Returns vpos as a negative number inside vblank, counting the number
* of scanlines to go until end of vblank, e.g., -1 means "one scanline
* until start of active scanout / end of vblank."
*
* Returns:
*
* True on success, false if a reliable scanout position counter could
* not be read out.
*
* This is deprecated and should not be used by new drivers.
* Use &drm_crtc_helper_funcs.get_scanout_position instead.
*/
bool (*get_scanout_position) (struct drm_device *dev, unsigned int pipe,
bool in_vblank_irq, int *vpos, int *hpos,
ktime_t *stime, ktime_t *etime,
const struct drm_display_mode *mode);
/**
* @get_vblank_timestamp:
*
* Called by drm_get_last_vbltimestamp(). Should return a precise
* timestamp when the most recent VBLANK interval ended or will end.
*
* Specifically, the timestamp in @vblank_time should correspond as
* closely as possible to the time when the first video scanline of
* the video frame after the end of VBLANK will start scanning out,
* the time immediately after end of the VBLANK interval. If the
* @crtc is currently inside VBLANK, this will be a time in the future.
* If the @crtc is currently scanning out a frame, this will be the
* past start time of the current scanout. This is meant to adhere
* to the OpenML OML_sync_control extension specification.
*
* Paramters:
*
* dev:
* dev DRM device handle.
* pipe:
* crtc for which timestamp should be returned.
* max_error:
* Maximum allowable timestamp error in nanoseconds.
* Implementation should strive to provide timestamp
* with an error of at most max_error nanoseconds.
* Returns true upper bound on error for timestamp.
* vblank_time:
* Target location for returned vblank timestamp.
* in_vblank_irq:
* True when called from drm_crtc_handle_vblank(). Some drivers
* need to apply some workarounds for gpu-specific vblank irq quirks
* if flag is set.
*
* Returns:
*
* True on success, false on failure, which means the core should
* fallback to a simple timestamp taken in drm_crtc_handle_vblank().
*
* FIXME:
*
* We should move this hook to &struct drm_crtc_funcs like all the other
* vblank hooks.
*/
bool (*get_vblank_timestamp) (struct drm_device *dev, unsigned int pipe,
int *max_error,
ktime_t *vblank_time,
bool in_vblank_irq);
/**
* @irq_handler:
*
@ -758,6 +608,9 @@ struct drm_driver {
int (*dma_ioctl) (struct drm_device *dev, void *data, struct drm_file *file_priv);
int (*dma_quiescent) (struct drm_device *);
int (*context_dtor) (struct drm_device *dev, int context);
u32 (*get_vblank_counter)(struct drm_device *dev, unsigned int pipe);
int (*enable_vblank)(struct drm_device *dev, unsigned int pipe);
void (*disable_vblank)(struct drm_device *dev, unsigned int pipe);
int dev_priv_size;
};

4
include/drm/drm_vblank.h
Просмотреть файл

@ -230,10 +230,6 @@ u64 drm_crtc_accurate_vblank_count(struct drm_crtc *crtc);
void drm_vblank_restore(struct drm_device *dev, unsigned int pipe);
void drm_crtc_vblank_restore(struct drm_crtc *crtc);
bool drm_calc_vbltimestamp_from_scanoutpos(struct drm_device *dev,
unsigned int pipe, int *max_error,
ktime_t *vblank_time,
bool in_vblank_irq);
void drm_calc_timestamping_constants(struct drm_crtc *crtc,
const struct drm_display_mode *mode);
wait_queue_head_t *drm_crtc_vblank_waitqueue(struct drm_crtc *crtc);