From: Roger Quadros rogerq@ti.com
commit 8ff42da411474893ae373d4280ea88954fa97fcc upstream.
Introduce HWMOD_CLKDM_NOAUTO flag that allows the hwmod's clockdomain to be prevented from HW_AUTO while the hwmod is active.
This is needed to workaround some modules which don't function correctly with HW_AUTO. e.g. DCAN on DRA7.
Signed-off-by: Roger Quadros rogerq@ti.com [nsekhar@ti.com: rebased to v4.9 kernel] Signed-off-by: Sekhar Nori nsekhar@ti.com Signed-off-by: Tony Lindgren tony@atomide.com Signed-off-by: Sam Protsenko semen.protsenko@linaro.org --- arch/arm/mach-omap2/omap_hwmod.c | 9 +++++++-- arch/arm/mach-omap2/omap_hwmod.h | 5 +++++ 2 files changed, 12 insertions(+), 2 deletions(-)
diff --git a/arch/arm/mach-omap2/omap_hwmod.c b/arch/arm/mach-omap2/omap_hwmod.c index c1c0fda2f71e..32dcfca42fca 100644 --- a/arch/arm/mach-omap2/omap_hwmod.c +++ b/arch/arm/mach-omap2/omap_hwmod.c @@ -2155,7 +2155,7 @@ static int _enable(struct omap_hwmod *oh)
r = (soc_ops.wait_target_ready) ? soc_ops.wait_target_ready(oh) : -EINVAL; - if (oh->clkdm) + if (oh->clkdm && !(oh->flags & HWMOD_CLKDM_NOAUTO)) clkdm_allow_idle(oh->clkdm);
if (!r) { @@ -2212,7 +2212,12 @@ static int _idle(struct omap_hwmod *oh) _idle_sysc(oh); _del_initiator_dep(oh, mpu_oh);
- if (oh->clkdm) + /* + * If HWMOD_CLKDM_NOAUTO is set then we don't + * deny idle the clkdm again since idle was already denied + * in _enable() + */ + if (oh->clkdm && !(oh->flags & HWMOD_CLKDM_NOAUTO)) clkdm_deny_idle(oh->clkdm);
if (oh->flags & HWMOD_BLOCK_WFI) diff --git a/arch/arm/mach-omap2/omap_hwmod.h b/arch/arm/mach-omap2/omap_hwmod.h index 7c7a31169475..f772f6c77125 100644 --- a/arch/arm/mach-omap2/omap_hwmod.h +++ b/arch/arm/mach-omap2/omap_hwmod.h @@ -527,6 +527,10 @@ struct omap_hwmod_omap4_prcm { * operate and they need to be handled at the same time as the main_clk. * HWMOD_NO_IDLE: Do not idle the hwmod at all. Useful to handle certain * IPs like CPSW on DRA7, where clocks to this module cannot be disabled. + * HWMOD_CLKDM_NOAUTO: Allows the hwmod's clockdomain to be prevented from + * entering HW_AUTO while hwmod is active. This is needed to workaround + * some modules which don't function correctly with HW_AUTO. For example, + * DCAN on DRA7x SoC needs this to workaround errata i893. */ #define HWMOD_SWSUP_SIDLE (1 << 0) #define HWMOD_SWSUP_MSTANDBY (1 << 1) @@ -544,6 +548,7 @@ struct omap_hwmod_omap4_prcm { #define HWMOD_RECONFIG_IO_CHAIN (1 << 13) #define HWMOD_OPT_CLKS_NEEDED (1 << 14) #define HWMOD_NO_IDLE (1 << 15) +#define HWMOD_CLKDM_NOAUTO (1 << 16)
/* * omap_hwmod._int_flags definitions