HACK: OMAP: DSS2: add delay after enabling clocks

On omap4 the registers may not be accessible right after enabling the
clocks. At some point this will be handled by pm_runtime, but, for the
time begin, adding a small delay after clk_enable() should make things
work.

Signed-off-by: Tomi Valkeinen <tomi.valkeinen@ti.com>

1 files changed, 8 insertions, 0 deletions

diff --git a/drivers/video/omap2/dss/dss.c b/drivers/video/omap2/dss/dss.c
index e5da050bcf85..2be4d03ece43 100644
--- a/drivers/video/omap2/dss/dss.c
+++ b/drivers/video/omap2/dss/dss.c
@@ -850,6 +850,14 @@ void dss_clk_enable(enum dss_clock clks)
 
         dss_clk_enable_no_ctx(clks);
 
+        /*
+         * HACK: On omap4 the registers may not be accessible right after
+         * enabling the clocks. At some point this will be handled by
+         * pm_runtime, but for the time begin this should make things work.
+         */
+        if (cpu_is_omap44xx() && check_ctx)
+                udelay(10);
+
         if (check_ctx && cpu_is_omap34xx() && dss_need_ctx_restore())
                 restore_all_ctx();
 }