Re: [PATCH] drm: sti: implement CRC capture API

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On Thu, Jan 05, 2017 at 12:12:36PM +0100, Benjamin Gaignard wrote:
> Use CRC API to retrieve the 3 crc values from hardware.
> 
> Signed-off-by: Benjamin Gaignard <benjamin.gaignard@xxxxxxxxxx>
> ---
> This patch should be applied on top of drm-misc branch where Tomeu
> has change crc.lock.
> 
> I think that wake_up_interruptible() could also be call at the end
> of drm_crtc_add_crc_entry() to avoid putting it in all drivers.

+1 on moving the wake_up call into the drm_crtc_add_crc_entry function.
 
Care to spin that patch please?
-Daniel

> 
> Cc: Tomeu Vizoso <tomeu.vizoso@xxxxxxxxxxxxx>
> Cc: Daniel Vetter <daniel.vetter@xxxxxxxx>
> ---
>  drivers/gpu/drm/sti/sti_crtc.c  | 27 +++++++++++++++++++++++
>  drivers/gpu/drm/sti/sti_mixer.c | 47 +++++++++++++++++++++++++++++++++++++++++
>  drivers/gpu/drm/sti/sti_mixer.h |  4 ++++
>  3 files changed, 78 insertions(+)
> 
> diff --git a/drivers/gpu/drm/sti/sti_crtc.c b/drivers/gpu/drm/sti/sti_crtc.c
> index e992bed..47022b4 100644
> --- a/drivers/gpu/drm/sti/sti_crtc.c
> +++ b/drivers/gpu/drm/sti/sti_crtc.c
> @@ -20,6 +20,8 @@
>  #include "sti_vid.h"
>  #include "sti_vtg.h"
>  
> +#define CRC_SAMPLES 3
> +
>  static void sti_crtc_enable(struct drm_crtc *crtc)
>  {
>  	struct sti_mixer *mixer = to_sti_mixer(crtc);
> @@ -253,6 +255,8 @@ int sti_crtc_vblank_cb(struct notifier_block *nb,
>  	unsigned long flags;
>  	struct sti_private *priv;
>  	unsigned int pipe;
> +	u32 crcs[CRC_SAMPLES];
> +	int ret;
>  
>  	priv = crtc->dev->dev_private;
>  	pipe = drm_crtc_index(crtc);
> @@ -275,6 +279,12 @@ int sti_crtc_vblank_cb(struct notifier_block *nb,
>  	}
>  	spin_unlock_irqrestore(&crtc->dev->event_lock, flags);
>  
> +	if (!sti_mixer_read_crcs(mixer, &crcs[0], &crcs[1], &crcs[2])) {
> +		ret = drm_crtc_add_crc_entry(crtc, false, 0, crcs);
> +		if (!ret)
> +			wake_up_interruptible(&crtc->crc.wq);
> +	}
> +
>  	if (mixer->status == STI_MIXER_DISABLING) {
>  		struct drm_plane *p;
>  
> @@ -343,6 +353,22 @@ static int sti_crtc_late_register(struct drm_crtc *crtc)
>  	return 0;
>  }
>  
> +int sti_set_crc_source(struct drm_crtc *crtc, const char *source,
> +		       size_t *values_cnt)
> +{
> +	struct sti_mixer *mixer = to_sti_mixer(crtc);
> +
> +	*values_cnt = CRC_SAMPLES;
> +
> +	if (!source)
> +		return sti_mixer_set_crc_status(mixer, false);
> +
> +	if (source && strcmp(source, "auto") == 0)
> +		return sti_mixer_set_crc_status(mixer, true);
> +
> +	return -EINVAL;
> +}
> +
>  static const struct drm_crtc_funcs sti_crtc_funcs = {
>  	.set_config = drm_atomic_helper_set_config,
>  	.page_flip = drm_atomic_helper_page_flip,
> @@ -352,6 +378,7 @@ static int sti_crtc_late_register(struct drm_crtc *crtc)
>  	.atomic_duplicate_state = drm_atomic_helper_crtc_duplicate_state,
>  	.atomic_destroy_state = drm_atomic_helper_crtc_destroy_state,
>  	.late_register = sti_crtc_late_register,
> +	.set_crc_source = sti_set_crc_source,
>  };
>  
>  bool sti_crtc_is_main(struct drm_crtc *crtc)
> diff --git a/drivers/gpu/drm/sti/sti_mixer.c b/drivers/gpu/drm/sti/sti_mixer.c
> index 4ddc58f..4eb5cc5 100644
> --- a/drivers/gpu/drm/sti/sti_mixer.c
> +++ b/drivers/gpu/drm/sti/sti_mixer.c
> @@ -27,6 +27,13 @@
>  #define GAM_MIXER_ACT      0x38
>  #define GAM_MIXER_MBP      0x3C
>  #define GAM_MIXER_MX0      0x80
> +#define GAM_MIXER_MISR_CTL 0xA0
> +#define GAM_MIXER_MISR_STA 0xA4
> +#define GAM_MIXER_SIGN1    0xA8
> +#define GAM_MIXER_SIGN2    0xAC
> +#define GAM_MIXER_SIGN3    0xB0
> +#define GAM_MIXER_MISR_AVO 0xB4
> +#define GAM_MIXER_MISR_AVS 0xB8
>  
>  /* id for depth of CRB reg */
>  #define GAM_DEPTH_VID0_ID  1
> @@ -162,6 +169,13 @@ static int mixer_dbg_show(struct seq_file *s, void *arg)
>  	DBGFS_DUMP(GAM_MIXER_MBP);
>  	DBGFS_DUMP(GAM_MIXER_MX0);
>  	mixer_dbg_mxn(s, mixer->regs + GAM_MIXER_MX0);
> +	DBGFS_DUMP(GAM_MIXER_MISR_CTL);
> +	DBGFS_DUMP(GAM_MIXER_MISR_STA);
> +	DBGFS_DUMP(GAM_MIXER_SIGN1);
> +	DBGFS_DUMP(GAM_MIXER_SIGN2);
> +	DBGFS_DUMP(GAM_MIXER_SIGN3);
> +	DBGFS_DUMP(GAM_MIXER_MISR_AVO);
> +	DBGFS_DUMP(GAM_MIXER_MISR_AVS);
>  	seq_puts(s, "\n");
>  
>  	return 0;
> @@ -202,6 +216,36 @@ int sti_mixer_debugfs_init(struct sti_mixer *mixer, struct drm_minor *minor)
>  					minor->debugfs_root, minor);
>  }
>  
> +int sti_mixer_set_crc_status(struct sti_mixer *mixer, bool enable)
> +{
> +	if (enable) {
> +		sti_mixer_reg_read(mixer, GAM_MIXER_MISR_STA);
> +		sti_mixer_reg_read(mixer, GAM_MIXER_SIGN1);
> +		sti_mixer_reg_read(mixer, GAM_MIXER_SIGN2);
> +		sti_mixer_reg_read(mixer, GAM_MIXER_SIGN3);
> +		sti_mixer_reg_write(mixer, GAM_MIXER_MISR_CTL, 0x0F);
> +	} else {
> +		sti_mixer_reg_write(mixer, GAM_MIXER_MISR_CTL, 0x00);
> +	}
> +
> +	return 0;
> +}
> +
> +int sti_mixer_read_crcs(struct sti_mixer *mixer,
> +			u32 *sign1, u32 *sign2, u32 *sign3)
> +{
> +	u32 status = sti_mixer_reg_read(mixer, GAM_MIXER_MISR_STA);
> +
> +	if (!(status & 0x1))
> +		return -EINVAL;
> +
> +	*sign1 = sti_mixer_reg_read(mixer, GAM_MIXER_SIGN1);
> +	*sign2 = sti_mixer_reg_read(mixer, GAM_MIXER_SIGN2);
> +	*sign3 = sti_mixer_reg_read(mixer, GAM_MIXER_SIGN3);
> +
> +	return 0;
> +}
> +
>  void sti_mixer_set_background_status(struct sti_mixer *mixer, bool enable)
>  {
>  	u32 val = sti_mixer_reg_read(mixer, GAM_MIXER_CTL);
> @@ -301,6 +345,9 @@ int sti_mixer_active_video_area(struct sti_mixer *mixer,
>  	sti_mixer_reg_write(mixer, GAM_MIXER_AVO, ydo << 16 | xdo);
>  	sti_mixer_reg_write(mixer, GAM_MIXER_AVS, yds << 16 | xds);
>  
> +	sti_mixer_reg_write(mixer, GAM_MIXER_MISR_AVO, ydo << 16 | xdo);
> +	sti_mixer_reg_write(mixer, GAM_MIXER_MISR_AVS, yds << 16 | xds);
> +
>  	sti_mixer_set_background_color(mixer, bkg_color);
>  
>  	sti_mixer_set_background_area(mixer, mode);
> diff --git a/drivers/gpu/drm/sti/sti_mixer.h b/drivers/gpu/drm/sti/sti_mixer.h
> index 830a3c4..b16feb1 100644
> --- a/drivers/gpu/drm/sti/sti_mixer.h
> +++ b/drivers/gpu/drm/sti/sti_mixer.h
> @@ -55,6 +55,10 @@ int sti_mixer_active_video_area(struct sti_mixer *mixer,
>  
>  void sti_mixer_set_background_status(struct sti_mixer *mixer, bool enable);
>  
> +int sti_mixer_set_crc_status(struct sti_mixer *mixer, bool enable);
> +int sti_mixer_read_crcs(struct sti_mixer *mixer,
> +			u32 *sign1, u32 *sign2, u32 *sign3);
> +
>  int sti_mixer_debugfs_init(struct sti_mixer *mixer, struct drm_minor *minor);
>  
>  /* depth in Cross-bar control = z order */
> -- 
> 1.9.1
> 

-- 
Daniel Vetter
Software Engineer, Intel Corporation
http://blog.ffwll.ch
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