diff options
| author | Jyri Sarha <jsarha@ti.com> | 2016-01-08 15:33:09 +0300 |
|---|---|---|
| committer | Jyri Sarha <jsarha@ti.com> | 2016-02-25 17:39:45 +0300 |
| commit | 5895d08f6ff2175dabc373dada7d1bfa26123fc9 (patch) | |
| tree | ba01bad72821ac99d67b5f21868b002662d935be /drivers/gpu/drm/tilcdc/tilcdc_crtc.c | |
| parent | c0c2baaab1b553df92a24e9175440f15e6ad3e2c (diff) | |
| download | linux-5895d08f6ff2175dabc373dada7d1bfa26123fc9.tar.xz | |
drm/tilcdc: Disable sync lost interrupt if it fires on every frame
Disable the sync lost interrupt if it fires on every frame for 50
consecutive frames in a row. This is relatively sure sign of the sync
lost interrupt being stuck and firing on every frame even if the
display otherwise appears to work OK.
Signed-off-by: Jyri Sarha <jsarha@ti.com>
Reviewed-by: Tomi Valkeinen <tomi.valkeinen@ti.com>
Diffstat (limited to 'drivers/gpu/drm/tilcdc/tilcdc_crtc.c')
| -rw-r--r-- | drivers/gpu/drm/tilcdc/tilcdc_crtc.c | 21 |
1 files changed, 20 insertions, 1 deletions
diff --git a/drivers/gpu/drm/tilcdc/tilcdc_crtc.c b/drivers/gpu/drm/tilcdc/tilcdc_crtc.c index 5ee22c6b37e8..248e3ea7568c 100644 --- a/drivers/gpu/drm/tilcdc/tilcdc_crtc.c +++ b/drivers/gpu/drm/tilcdc/tilcdc_crtc.c @@ -43,6 +43,9 @@ struct tilcdc_crtc { /* Only set if an external encoder is connected */ bool simulate_vesa_sync; + + int sync_lost_count; + bool frame_intact; }; #define to_tilcdc_crtc(x) container_of(x, struct tilcdc_crtc, base) @@ -662,6 +665,8 @@ out: pm_runtime_put_sync(dev->dev); } +#define SYNC_LOST_COUNT_LIMIT 50 + irqreturn_t tilcdc_crtc_irq(struct drm_crtc *crtc) { struct tilcdc_crtc *tilcdc_crtc = to_tilcdc_crtc(crtc); @@ -707,6 +712,11 @@ irqreturn_t tilcdc_crtc_irq(struct drm_crtc *crtc) spin_unlock_irqrestore(&dev->event_lock, flags); } + + if (tilcdc_crtc->frame_intact) + tilcdc_crtc->sync_lost_count = 0; + else + tilcdc_crtc->frame_intact = true; } if (priv->rev == 2) { @@ -717,9 +727,18 @@ irqreturn_t tilcdc_crtc_irq(struct drm_crtc *crtc) tilcdc_write(dev, LCDC_END_OF_INT_IND_REG, 0); } - if (stat & LCDC_SYNC_LOST) + if (stat & LCDC_SYNC_LOST) { dev_err_ratelimited(dev->dev, "%s(0x%08x): Sync lost", __func__, stat); + tilcdc_crtc->frame_intact = false; + if (tilcdc_crtc->sync_lost_count++ > SYNC_LOST_COUNT_LIMIT) { + dev_err(dev->dev, + "%s(0x%08x): Sync lost flood detected, disabling the interrupt", + __func__, stat); + tilcdc_write(dev, LCDC_INT_ENABLE_CLR_REG, + LCDC_SYNC_LOST); + } + } if (stat & LCDC_FIFO_UNDERFLOW) dev_err_ratelimited(dev->dev, "%s(0x%08x): FIFO underfow", |