[PATCH 6/7] drm/exynos/mixer: replace MXR_INT_EN register cache with flag

[Andrzej Hajda]

Driver uses only VSYNC interrupts, so we need to cache VSYNC bit state only.

Signed-off-by: Andrzej Hajda <a.hajda at samsung.com>
---
 drivers/gpu/drm/exynos/exynos_mixer.c | 20 +++++++++-----------
 1 file changed, 9 insertions(+), 11 deletions(-)

diff --git a/drivers/gpu/drm/exynos/exynos_mixer.c b/drivers/gpu/drm/exynos/exynos_mixer.c
index 2465b1d..4858170e 100644
--- a/drivers/gpu/drm/exynos/exynos_mixer.c
+++ b/drivers/gpu/drm/exynos/exynos_mixer.c
@@ -87,6 +87,7 @@ enum mixer_version_id {
 
 enum mixer_flag_bits {
 	MXR_BIT_POWERED,
+	MXR_BIT_VSYNC,
 };
 
 struct mixer_context {
@@ -98,7 +99,6 @@ struct mixer_context {
 	bool			interlace;
 	bool			vp_enabled;
 	bool			has_sclk;
-	u32			int_en;
 
 	struct mixer_resources	mixer_res;
 	struct hdmi_win_data	win_data[MIXER_WIN_NR];
@@ -897,10 +897,9 @@ static int mixer_enable_vblank(struct exynos_drm_manager *mgr)
 	struct mixer_context *mixer_ctx = mgr->ctx;
 	struct mixer_resources *res = &mixer_ctx->mixer_res;
 
-	if (!test_bit(MXR_BIT_POWERED, &mixer_ctx->flags)) {
-		mixer_ctx->int_en |= MXR_INT_EN_VSYNC;
+	__set_bit(MXR_BIT_VSYNC, &mixer_ctx->flags);
+	if (!test_bit(MXR_BIT_POWERED, &mixer_ctx->flags))
 		return 0;
-	}
 
 	/* enable vsync interrupt */
 	mixer_reg_writemask(res, MXR_INT_STATUS, ~0, MXR_INT_CLEAR_VSYNC);
@@ -914,10 +913,10 @@ static void mixer_disable_vblank(struct exynos_drm_manager *mgr)
 	struct mixer_context *mixer_ctx = mgr->ctx;
 	struct mixer_resources *res = &mixer_ctx->mixer_res;
 
-	if (!test_bit(MXR_BIT_POWERED, &mixer_ctx->flags)) {
-		mixer_ctx->int_en &= MXR_INT_EN_VSYNC;
+	__clear_bit(MXR_BIT_VSYNC, &mixer_ctx->flags);
+
+	if (!test_bit(MXR_BIT_POWERED, &mixer_ctx->flags))
 		return;
-	}
 
 	/* disable vsync interrupt */
 	mixer_reg_writemask(res, MXR_INT_STATUS, ~0, MXR_INT_CLEAR_VSYNC);
@@ -1092,9 +1091,10 @@ static void mixer_poweron(struct exynos_drm_manager *mgr)
 
 	mixer_reg_writemask(res, MXR_STATUS, ~0, MXR_STATUS_SOFT_RESET);
 
-	if (ctx->int_en & MXR_INT_EN_VSYNC)
+	if (test_bit(MXR_BIT_VSYNC, &ctx->flags)) {
 		mixer_reg_writemask(res, MXR_INT_STATUS, ~0, MXR_INT_CLEAR_VSYNC);
-	mixer_reg_write(res, MXR_INT_EN, ctx->int_en);
+		mixer_reg_writemask(res, MXR_INT_EN, ~0, MXR_INT_EN_VSYNC);
+	}
 	mixer_win_reset(ctx);
 
 	mixer_window_resume(mgr);
@@ -1111,8 +1111,6 @@ static void mixer_poweroff(struct exynos_drm_manager *mgr)
 	mixer_stop(ctx);
 	mixer_window_suspend(mgr);
 
-	ctx->int_en = mixer_reg_read(res, MXR_INT_EN);
-
 	clear_bit(MXR_BIT_POWERED, &ctx->flags);
 
 	clk_disable_unprepare(res->mixer);
-- 
1.9.1