From: Tomi Valkeinen <tomi.valkeinen@ti.com>
Date: Thu, 3 Mar 2011 11:16:23 +0000 (+0200)
Subject: HACK: OMAP: DSS2: add delay after enabling clocks
X-Git-Tag: firefly_0821_release~7613^2~1826^2~58^2~34
X-Git-Url: http://demsky.eecs.uci.edu/git/?a=commitdiff_plain;h=85604b0a247615157cedfec46b9cbfde2884f80f;p=firefly-linux-kernel-4.4.55.git

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>
---

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();
 }