DSS needs all DSS clocks to be enabled to be able to finish reset
properly. Before v3.1-rc1 the omapdss driver was managing clocks and
resets correctly. However, when omapdss started using runtime PM at
v3.1-rc1, the responsibility for the reset moved to HWMOD framework.
HWMOD framework does not currently enable all the DSS clocks when
resetting the DSS hardware. This causes the HWMOD frameworks boot-time
reset to fail, possibly leaving the DSS hardware in undefined state.
This patch sets HWMOD_CONTROL_OPT_CLKS_IN_RESET for dss_core. The flag
is actually not used on OMAP4, because dss_core hardware does not have
soft-reset functionality and thus the HWMOD framework never resets nor
waits for the reset to finish.
However, while the flag is not strictly needed currently, I think it
represents the HW correctly: all the DSS clocks should be enabled after
power-on to allow DSS hardware to finish its reset.
A custom reset function will be added in the following patches which
manages this correctly for OMAP4.
Signed-off-by: Tomi Valkeinen <tomi.valkeinen@xxxxxx>
---
arch/arm/mach-omap2/omap_hwmod_44xx_data.c | 1 +
1 files changed, 1 insertions(+), 0 deletions(-)
diff --git a/arch/arm/mach-omap2/omap_hwmod_44xx_data.c b/arch/arm/mach-omap2/omap_hwmod_44xx_data.c
index 48c0458..4c2ac7e 100644
--- a/arch/arm/mach-omap2/omap_hwmod_44xx_data.c
+++ b/arch/arm/mach-omap2/omap_hwmod_44xx_data.c
@@ -1262,6 +1262,7 @@ static struct omap_hwmod_opt_clk dss_opt_clks[] = {
static struct omap_hwmod omap44xx_dss_hwmod = {
.name = "dss_core",
+ .flags = HWMOD_CONTROL_OPT_CLKS_IN_RESET,
.class = &omap44xx_dss_hwmod_class,
.clkdm_name = "l3_dss_clkdm",
.main_clk = "dss_dss_clk",
--
1.7.4.1
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