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drm/exynos: fimd: only finish update if START == START_S 

fimd_update_plane() programs BUF_START[win] and during the update
BUF_START[win] is copied to BUF_START_S[win] (its shadow register)
and starts scanning out, then it raises a irq.

The fimd_irq_handler, in the case we have a pending_fb, will check
the fb value was copied to START_S register and finish the update
in case of success.

Based on patch from Daniel Kurtz <djkurtz@chromium.org>

Signed-off-by: Gustavo Padovan <gustavo.padovan@collabora.co.uk>
Signed-off-by: Inki Dae <inki.dae@samsung.com>
This commit is contained in:
Gustavo Padovan 2015-08-15 13:26:16 -03:00 committed by Inki Dae
parent 4420508375
commit cb11b3f189
1 changed files with 6 additions and 2 deletions
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8
drivers/gpu/drm/exynos/exynos_drm_fimd.c
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@ -59,6 +59,7 @@
#define VIDWnALPHA1(win) (VIDW_ALPHA + 0x04 + (win) * 8)
#define VIDWx_BUF_START(win, buf) (VIDW_BUF_START(buf) + (win) * 8)
#define VIDWx_BUF_START_S(win, buf) (VIDW_BUF_START_S(buf) + (win) * 8)
#define VIDWx_BUF_END(win, buf) (VIDW_BUF_END(buf) + (win) * 8)
#define VIDWx_BUF_SIZE(win, buf) (VIDW_BUF_SIZE(buf) + (win) * 4)
@ -895,7 +896,7 @@ static const struct exynos_drm_crtc_ops fimd_crtc_ops = {
static irqreturn_t fimd_irq_handler(int irq, void *dev_id)
{
struct fimd_context *ctx = (struct fimd_context *)dev_id;
u32 val, clear_bit;
u32 val, clear_bit, start, start_s;
int win;
val = readl(ctx->regs + VIDINTCON1);
@ -917,7 +918,10 @@ static irqreturn_t fimd_irq_handler(int irq, void *dev_id)
if (!plane->pending_fb)
continue;
exynos_drm_crtc_finish_update(ctx->crtc, plane);
start = readl(ctx->regs + VIDWx_BUF_START(win, 0));
start_s = readl(ctx->regs + VIDWx_BUF_START_S(win, 0));
if (start == start_s)
exynos_drm_crtc_finish_update(ctx->crtc, plane);
}
if (ctx->i80_if) {