From: Rahul Sharma Rahul.Sharma@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@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; }