From: Gustavo Padovan <gustavo.padovan@xxxxxxxxxxxxxxx>
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@xxxxxxxxxxxx>
Signed-off-by: Gustavo Padovan <gustavo.padovan@xxxxxxxxxxxxxxx>
---
drivers/gpu/drm/exynos/exynos_drm_fimd.c | 8 ++++++--
1 file changed, 6 insertions(+), 2 deletions(-)
diff --git a/drivers/gpu/drm/exynos/exynos_drm_fimd.c b/drivers/gpu/drm/exynos/exynos_drm_fimd.c
index d41aa6a..c87b791 100644
--- a/drivers/gpu/drm/exynos/exynos_drm_fimd.c
+++ b/drivers/gpu/drm/exynos/exynos_drm_fimd.c
@@ -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) {
--
2.1.0
--
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