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Subject[PATCH 4.9 056/109] drm/exynos/decon5433: set STANDALONE_UPDATE_F also if planes are disabled
Date
4.9-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Andrzej Hajda <a.hajda@samsung.com>


[ Upstream commit 821b40b79db7dedbfe15ab330dfd181e661a533f ]

STANDALONE_UPDATE_F should be set if something changed in plane configurations,
including plane disable.
The patch fixes page-faults bugs, caused by decon still using framebuffers
of disabled planes.

v2: fixed clear-bit code (Thx Marek)
v3: use test_and_clear_bit (Thx Joonyoung)

Signed-off-by: Andrzej Hajda <a.hajda@samsung.com>
Tested-by: Joonyoung Shim <jy0922.shim@samsung.com>
Signed-off-by: Inki Dae <inki.dae@samsung.com>
Signed-off-by: Sasha Levin <alexander.levin@verizon.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
drivers/gpu/drm/exynos/exynos5433_drm_decon.c | 8 +++++---
1 file changed, 5 insertions(+), 3 deletions(-)

--- a/drivers/gpu/drm/exynos/exynos5433_drm_decon.c
+++ b/drivers/gpu/drm/exynos/exynos5433_drm_decon.c
@@ -46,7 +46,8 @@ enum decon_flag_bits {
BIT_CLKS_ENABLED,
BIT_IRQS_ENABLED,
BIT_WIN_UPDATED,
- BIT_SUSPENDED
+ BIT_SUSPENDED,
+ BIT_REQUEST_UPDATE
};

struct decon_context {
@@ -313,6 +314,7 @@ static void decon_update_plane(struct ex

/* window enable */
decon_set_bits(ctx, DECON_WINCONx(win), WINCONx_ENWIN_F, ~0);
+ set_bit(BIT_REQUEST_UPDATE, &ctx->flags);
}

static void decon_disable_plane(struct exynos_drm_crtc *crtc,
@@ -325,6 +327,7 @@ static void decon_disable_plane(struct e
return;

decon_set_bits(ctx, DECON_WINCONx(win), WINCONx_ENWIN_F, 0);
+ set_bit(BIT_REQUEST_UPDATE, &ctx->flags);
}

static void decon_atomic_flush(struct exynos_drm_crtc *crtc)
@@ -338,8 +341,7 @@ static void decon_atomic_flush(struct ex
for (i = ctx->first_win; i < WINDOWS_NR; i++)
decon_shadow_protect_win(ctx, i, false);

- /* update iff there are active windows */
- if (crtc->base.state->plane_mask)
+ if (test_and_clear_bit(BIT_REQUEST_UPDATE, &ctx->flags))
decon_set_bits(ctx, DECON_UPDATE, STANDALONE_UPDATE_F, ~0);

if (ctx->out_type & IFTYPE_I80)

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