Re: [PATCH 01/23] drm: Add get_scanout_position() to struct drm_crtc_helper_funcs

[Thomas Zimmermann <tzimmermann@suse.de>]

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Hi

Am 14.01.20 um 16:31 schrieb Yannick FERTRE:
> Thanks for the patch.
> 
> Tested-by: Yannick Fertré <yannick.fertre@st.com> 

Thanks for testing all these patches.

Best regards
Thomas

> 
> BR
> Yannick Fertré
> 
> 
> On 1/10/20 10:21 AM, Thomas Zimmermann wrote:
>> The new callback get_scanout_position() reads the current location of
>> the scanout process. The operation is currentyl located in struct
>> drm_driver, but really belongs to the CRTC. Drivers will be converted
>> in separate patches.
>>
>> Signed-off-by: Thomas Zimmermann <tzimmermann@suse.de>
>> ---
>>  drivers/gpu/drm/drm_vblank.c             | 24 ++++++++----
>>  include/drm/drm_drv.h                    |  7 +---
>>  include/drm/drm_modeset_helper_vtables.h | 47 ++++++++++++++++++++++++
>>  3 files changed, 65 insertions(+), 13 deletions(-)
>>
>> diff --git a/drivers/gpu/drm/drm_vblank.c b/drivers/gpu/drm/drm_vblank.c
>> index 1659b13b178c..c12f0b333e14 100644
>> --- a/drivers/gpu/drm/drm_vblank.c
>> +++ b/drivers/gpu/drm/drm_vblank.c
>> @@ -30,6 +30,7 @@
>>  #include <drm/drm_crtc.h>
>>  #include <drm/drm_drv.h>
>>  #include <drm/drm_framebuffer.h>
>> +#include <drm/drm_modeset_helper_vtables.h>
>>  #include <drm/drm_print.h>
>>  #include <drm/drm_vblank.h>
>>  
>> @@ -590,7 +591,7 @@ EXPORT_SYMBOL(drm_calc_timestamping_constants);
>>   * 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_driver.get_vblank_timestamp implementation of a kms driver
>> - * if &drm_driver.get_scanout_position is implemented.
>> + * if &drm_crtc_helper_funcs.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
>> @@ -632,8 +633,9 @@ bool drm_calc_vbltimestamp_from_scanoutpos(struct drm_device *dev,
>>  	}
>>  
>>  	/* Scanout position query not supported? Should not happen. */
>> -	if (!dev->driver->get_scanout_position) {
>> -		DRM_ERROR("Called from driver w/o get_scanout_position()!?\n");
>> +	if (!dev->driver->get_scanout_position ||
>> +	    !crtc->helper_private->get_scanout_position) {
>> +		DRM_ERROR("Called from CRTC w/o get_scanout_position()!?\n");
>>  		return false;
>>  	}
>>  
>> @@ -664,11 +666,17 @@ bool drm_calc_vbltimestamp_from_scanoutpos(struct drm_device *dev,
>>  		 * Get vertical and horizontal scanout position vpos, hpos,
>>  		 * and bounding timestamps stime, etime, pre/post query.
>>  		 */
>> -		vbl_status = dev->driver->get_scanout_position(dev, pipe,
>> -							       in_vblank_irq,
>> -							       &vpos, &hpos,
>> -							       &stime, &etime,
>> -							       mode);
>> +		if (crtc->helper_private->get_scanout_position) {
>> +			vbl_status =
>> +				crtc->helper_private->get_scanout_position(
>> +					crtc, in_vblank_irq, &vpos, &hpos,
>> +					&stime, &etime, mode);
>> +		} else {
>> +			vbl_status =
>> +				dev->driver->get_scanout_position(
>> +					dev, pipe, in_vblank_irq, &vpos,
>> +					&hpos, &stime, &etime, mode);
>> +		}
>>  
>>  		/* Return as no-op if scanout query unsupported or failed. */
>>  		if (!vbl_status) {
>> diff --git a/include/drm/drm_drv.h b/include/drm/drm_drv.h
>> index cf13470810a5..d0049e5786fc 100644
>> --- a/include/drm/drm_drv.h
>> +++ b/include/drm/drm_drv.h
>> @@ -362,11 +362,8 @@ struct drm_driver {
>>  	 * True on success, false if a reliable scanout position counter could
>>  	 * not be read out.
>>  	 *
>> -	 * FIXME:
>> -	 *
>> -	 * Since this is a helper to implement @get_vblank_timestamp, we should
>> -	 * move it to &struct drm_crtc_helper_funcs, like all the other
>> -	 * helper-internal hooks.
>> +	 * 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,
>> diff --git a/include/drm/drm_modeset_helper_vtables.h b/include/drm/drm_modeset_helper_vtables.h
>> index 5a87f1bd7a3f..e398512bfd5f 100644
>> --- a/include/drm/drm_modeset_helper_vtables.h
>> +++ b/include/drm/drm_modeset_helper_vtables.h
>> @@ -450,6 +450,53 @@ struct drm_crtc_helper_funcs {
>>  	 */
>>  	void (*atomic_disable)(struct drm_crtc *crtc,
>>  			       struct drm_crtc_state *old_crtc_state);
>> +
>> +	/**
>> +	 * @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 the 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
>> +	 * @drm_driver.get_vblank_timestamp callback.
>> +	 *
>> +	 * Parameters:
>> +	 *
>> +	 * crtc:
>> +	 *     The CRTC.
>> +	 * 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 the 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.
>> +	 */
>> +	bool (*get_scanout_position)(struct drm_crtc *crtc,
>> +				     bool in_vblank_irq, int *vpos, int *hpos,
>> +				     ktime_t *stime, ktime_t *etime,
>> +				     const struct drm_display_mode *mode);
>>  };
>>  
>>  /**
> 
> 
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> 

-- 
Thomas Zimmermann
Graphics Driver Developer
SUSE Software Solutions Germany GmbH
Maxfeldstr. 5, 90409 Nürnberg, Germany
(HRB 36809, AG Nürnberg)
Geschäftsführer: Felix Imendörffer


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