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drm/exynos/decon5433: update shadow registers iff there are active windows 

Improper usage of DECON_UPDATE register leads to subtle errors.
If it set in decon_commit when there are no active windows it results
in slow registry updates - all subsequent shadow registry updates takes more
than full vblank. On the other side if it is not set when there are
active windows it results in garbage on the screen after suspend/resume of
FB console.

The patch hopefully fixes it.

Signed-off-by: Andrzej Hajda <a.hajda@samsung.com>
Signed-off-by: Inki Dae <inki.dae@samsung.com>
This commit is contained in:
Andrzej Hajda 2017-01-09 15:33:02 +01:00 committed by Inki Dae
parent 9afe69d5a9
commit f65a7c9cb3
1 changed files with 3 additions and 4 deletions
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7
drivers/gpu/drm/exynos/exynos5433_drm_decon.c
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@ -188,8 +188,6 @@ static void decon_commit(struct exynos_drm_crtc *crtc)
/* enable output and display signal */
decon_set_bits(ctx, DECON_VIDCON0, VIDCON0_ENVID | VIDCON0_ENVID_F, ~0);
decon_set_bits(ctx, DECON_UPDATE, STANDALONE_UPDATE_F, ~0);
}
static void decon_win_set_pixfmt(struct decon_context *ctx, unsigned int win,
@ -340,8 +338,9 @@ static void decon_atomic_flush(struct exynos_drm_crtc *crtc)
for (i = ctx->first_win; i < WINDOWS_NR; i++)
decon_shadow_protect_win(ctx, i, false);
/* standalone update */
decon_set_bits(ctx, DECON_UPDATE, STANDALONE_UPDATE_F, ~0);
/* update iff there are active windows */
if (crtc->base.state->plane_mask)
decon_set_bits(ctx, DECON_UPDATE, STANDALONE_UPDATE_F, ~0);
if (ctx->out_type & IFTYPE_I80)
set_bit(BIT_WIN_UPDATED, &ctx->flags);