From: Rahul Sharma <Rahul.Sharma@xxxxxxxxxxx> Fimd probe is accessing fimd Registers without enabling the fimd gate clocks. If FIMD clocks are kept disabled in Uboot or disbaled during kernel boottime, the system hangs during boottime. 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 register without enabling the clock which is wrong and hangs the system. Signed-off-by: Rahul Sharma <Rahul.Sharma@xxxxxxxxxxx> --- Rebased on exynos-drm-next branch. 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 173ee97..a79ba0a 100644 --- a/drivers/gpu/drm/exynos/exynos_drm_fimd.c +++ b/drivers/gpu/drm/exynos/exynos_drm_fimd.c @@ -891,9 +891,15 @@ static int fimd_bind(struct device *dev, struct device *master, void *data) if (ctx->display) exynos_drm_create_enc_conn(drm_dev, ctx->display); + 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 _______________________________________________ dri-devel mailing list dri-devel@xxxxxxxxxxxxxxxxxxxxx http://lists.freedesktop.org/mailman/listinfo/dri-devel
