[PATCH] drm: sti: implement CRC capture API
Benjamin Gaignard
benjamin.gaignard at linaro.org
Fri Jan 6 09:06:50 UTC 2017
2017-01-06 9:22 GMT+01:00 Tomeu Vizoso <tomeu.vizoso at collabora.com>:
> On 5 January 2017 at 12:12, Benjamin Gaignard
> <benjamin.gaignard at linaro.org> wrote:
>> Use CRC API to retrieve the 3 crc values from hardware.
>>
>> Signed-off-by: Benjamin Gaignard <benjamin.gaignard at linaro.org>
>> ---
>> 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.
>
> Agreed, I can send such a patch if you don't have time.
I just finish to test the patches I will send them asap
>
> Btw, do any tests from iGT that make use of CRCs pass with this? If
> so, would be good to note it in the commit message.
I don't run IGT just modetest and cat on crtc-0/crc/data
>
>> Cc: Tomeu Vizoso <tomeu.vizoso at collabora.com>
>> Cc: Daniel Vetter <daniel.vetter at ffwll.ch>
>> ---
>> 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])) {
>
> nit: I would place the return value of that function into ret, so it's
> easier to read and easier to instrument when debugging (and maybe log
> a debug message if it fails?).
sti_mixer_read_crcs() is called even if crc isn't enabled so status
bit could be set
at 0 without being an error...
>> + ret = drm_crtc_add_crc_entry(crtc, false, 0, crcs);
>
> Doesn't the frame number returned by drm_accurate_vblank_count()
> correspond to the fb contents characterized by these crcs?
My driver doesn't implement get_vblank_timestamp() so
drm_accurate_vblank_count()
won't work.
> When the CRCs come from a sink, we don't have a good way of knowing to
> which frame count they correspond, but in this case I would expect
> that the mixer was programmed with the new fb contents for this vblank
> count.
>
> Tests can be more extensive if there are frame numbers.
>
>> + 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;
>
> Does it mean that the HW isn't able to return a CRC yet? If so, maybe
> -EAGAIN would be more appropriate?
Yes I will change that
> In any case, this should be more explicit for increased readability,
> maybe add a macro for 0x1 with a descriptive name?
Done in v2
>
>> + *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);
>
> Just out of curiosity: what is sign meant to mean here?
it means signature i.e. it is the result of R, G, B (or Cr,Cb,Luma) computation.
>
> Looks very good, thanks!
>
> Tomeu
>
>> +
>> + 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
>>
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--
Benjamin Gaignard
Graphic Study Group
Linaro.org │ Open source software for ARM SoCs
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