[PATCH] drm/exynos: enable fimd clocks in probe before accessing fimd registers

[Rahul Sharma]

From: Rahul Sharma <Rahul.Sharma at samsung.com>

Fimd probe is accessing fimd Registers without enabling the fimd
gate clocks. This hangs the system at boot time.

This issue got surfaced when verifying with sysmmu enabled. Probe of
fimd Sysmmu enables the master clock before accessing sysmmu regs and
then disables. Later fimd probe tries to read the reegister without
enabling the clock which is wrong and hangs the system.

Signed-off-by: Rahul Sharma <Rahul.Sharma at samsung.com>
---
 drivers/gpu/drm/exynos/exynos_drm_fimd.c |    6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/drivers/gpu/drm/exynos/exynos_drm_fimd.c b/drivers/gpu/drm/exynos/exynos_drm_fimd.c
index 40fd6cc..8706fde 100644
--- a/drivers/gpu/drm/exynos/exynos_drm_fimd.c
+++ b/drivers/gpu/drm/exynos/exynos_drm_fimd.c
@@ -916,9 +916,15 @@ static int fimd_probe(struct platform_device *pdev)
 
 	pm_runtime_enable(dev);
 
+	clk_prepare_enable(ctx->bus_clk);
+	clk_prepare_enable(ctx->lcd_clk);
+
 	for (win = 0; win < WINDOWS_NR; win++)
 		fimd_clear_win(ctx, win);
 
+	clk_disable_unprepare(ctx->lcd_clk);
+	clk_disable_unprepare(ctx->bus_clk);
+
 	return 0;
 }
 
-- 
1.7.9.5