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authorPaul Walmsley <paul@pwsan.com>2012-09-23 17:28:28 -0600
committerPaul Walmsley <paul@pwsan.com>2012-09-23 17:28:28 -0600
commitb71c72178e24118214f21567a15adcad61b4238a (patch)
tree65d550588f5c76db32905c6ceddc2dc20ef0a1cd /arch/arm/mach-omap2/clockdomains44xx_data.c
parent5c3e4ec48586f6dfb482f1c524748948ba14021e (diff)
downloadlinux-next-b71c72178e24118214f21567a15adcad61b4238a.tar.gz
ARM: OMAP2+: clockdomain/hwmod: add workaround for EMU clockdomain idle problems
The idle status of the IP blocks and clocks inside the EMU clockdomain isn't taken into account by the PRCM hardware when deciding whether the clockdomain is idle. Add a workaround flag in the clockdomain code, CLKDM_MISSING_IDLE_REPORTING, to deal with this problem, and add the code necessary to support it. If CLKDM_MISSING_IDLE_REPORTING is set on a clockdomain, the clockdomain will be forced active whenever an IP block inside that clockdomain is in use, even if the clockdomain supports hardware-supervised idle. When the kernel indicates that the last active IP block inside the clockdomain is no longer used, the clockdomain will be forced idle, or, if that mode is not supported in the hardware, it will be placed into hardware-supervised idle. This patch is an equal collaboration with Jon Hunter <jon-hunter@ti.com>. Ming Lei <ming.lei@canonical.com>, Will Deacon <will.deacon@arm.com>, Madhav Vij <mvij@ti.com>, Kevin Hilman <khilman@ti.com>, Benoît Cousson <b-cousson@ti.com>, and Santosh Shilimkar <santosh.shilimkar@ti.com> all made essential contributions to the understanding of EMU clockdomain power management on OMAP. Signed-off-by: Paul Walmsley <paul@pwsan.com> Cc: Jon Hunter <jon-hunter@ti.com> Cc: Ming Lei <ming.lei@canonical.com> Cc: Will Deacon <will.deacon@arm.com> Cc: Madhav Vij <mvij@ti.com> Cc: Kevin Hilman <khilman@ti.com> Cc: Benoît Cousson <b-cousson@ti.com> Cc: Santosh Shilimkar <santosh.shilimkar@ti.com> Tested-by: Jon Hunter <jon-hunter@ti.com>
Diffstat (limited to 'arch/arm/mach-omap2/clockdomains44xx_data.c')
-rw-r--r--arch/arm/mach-omap2/clockdomains44xx_data.c3
1 files changed, 2 insertions, 1 deletions
diff --git a/arch/arm/mach-omap2/clockdomains44xx_data.c b/arch/arm/mach-omap2/clockdomains44xx_data.c
index 63d60a773d3b..b56d06b48782 100644
--- a/arch/arm/mach-omap2/clockdomains44xx_data.c
+++ b/arch/arm/mach-omap2/clockdomains44xx_data.c
@@ -390,7 +390,8 @@ static struct clockdomain emu_sys_44xx_clkdm = {
.prcm_partition = OMAP4430_PRM_PARTITION,
.cm_inst = OMAP4430_PRM_EMU_CM_INST,
.clkdm_offs = OMAP4430_PRM_EMU_CM_EMU_CDOFFS,
- .flags = CLKDM_CAN_ENABLE_AUTO | CLKDM_CAN_FORCE_WAKEUP,
+ .flags = (CLKDM_CAN_ENABLE_AUTO | CLKDM_CAN_FORCE_WAKEUP |
+ CLKDM_MISSING_IDLE_REPORTING),
};
static struct clockdomain l3_dma_44xx_clkdm = {