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| author | Archit Taneja <archit@ti.com> | 2011-10-06 18:04:08 -0600 |
|---|---|---|
| committer | Paul Walmsley <paul@pwsan.com> | 2011-11-08 03:16:46 -0700 |
| commit | b923d40dd4211c4ef7d4efa2bd81b7ca1d8744c1 (patch) | |
| tree | d6814d77e420e4b1fa1e089378c331c9b9f60580 /arch/arm/mach-omap2/omap_hwmod_2420_data.c | |
| parent | 13662dc5b177d68885695ef513dd4ae0e4d2a099 (diff) | |
| download | talos-obmc-linux-b923d40dd4211c4ef7d4efa2bd81b7ca1d8744c1.tar.gz talos-obmc-linux-b923d40dd4211c4ef7d4efa2bd81b7ca1d8744c1.zip | |
ARM: OMAP2PLUS: DSS: Ensure DSS works correctly if display is enabled in bootloader
Resetting DISPC when a DISPC output is enabled causes the DSS to go into an
inconsistent state. Thus if the bootloader has enabled a display, the hwmod code
cannot reset the DISPC module just like that, but the outputs need to be
disabled first.
Add function dispc_disable_outputs() which disables all active overlay manager
and ensure all frame transfers are completed.
Modify omap_dss_reset() to call this function and clear DSS_CONTROL,
DSS_SDI_CONTROL and DSS_PLL_CONTROL so that DSS is in a clean state when the
DSS2 driver starts.
This resolves the hang issue(caused by a L3 error during boot) seen on the
beagle board C3, which has a factory bootloader that enables display. The issue
is resolved with this patch.
Thanks to Tomi and Sricharan for some additional testing.
Acked-by: Tomi Valkeinen <tomi.valkeinen@ti.com>
Tested-by: R, Sricharan <r.sricharan@ti.com>
Signed-off-by: Archit Taneja <archit@ti.com>
[paul@pwsan.com: restructured code, removed omap_{read,write}l(), removed
cpu_is_omap*() calls and converted to dev_attr]
Signed-off-by: Paul Walmsley <paul@pwsan.com>
Diffstat (limited to 'arch/arm/mach-omap2/omap_hwmod_2420_data.c')
| -rw-r--r-- | arch/arm/mach-omap2/omap_hwmod_2420_data.c | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/arch/arm/mach-omap2/omap_hwmod_2420_data.c b/arch/arm/mach-omap2/omap_hwmod_2420_data.c index 74037a5807af..a5409ce3f323 100644 --- a/arch/arm/mach-omap2/omap_hwmod_2420_data.c +++ b/arch/arm/mach-omap2/omap_hwmod_2420_data.c @@ -943,6 +943,7 @@ static struct omap_hwmod omap2420_dss_dispc_hwmod = { .slaves = omap2420_dss_dispc_slaves, .slaves_cnt = ARRAY_SIZE(omap2420_dss_dispc_slaves), .flags = HWMOD_NO_IDLEST, + .dev_attr = &omap2_3_dss_dispc_dev_attr }; /* l4_core -> dss_rfbi */ |
