From: Pierre-Louis Bossart pierre-louis.bossart@linux.intel.com
Add helpers to program SPA/CPA bits, using a mutex to access the shared LCTL register if required.
All links are managed with the same LCTLx.SPA bits. However there are quite a few implementation details to be aware of:
Legacy HDaudio multi-links are powered-up when exiting reset, which requires the ref_count to be manually set to one when initializing the link.
Alternate links for SoundWire/DMIC/SSP need to be explicitly powered-up before accessing the SHIM/IP/Vendor-Specific SHIM space for each sublink. DMIC/SSP/SoundWire are all different cases with a different device/dai/hlink relationship.
SoundWire will handle power management with the auxiliary device resume/suspend routine. The ref_count is not necessary in this case.
The DMIC/SSP will by contrast handle the power management from DAI .startup and .shutdown callbacks.
The SSP has a 1:1 mapping between sublink and DAI, but it's bidirectional so the ref_count will help avoid turning off the sublink when one of the two directions is still in use.
The DMIC has a single link but two DAIs for data generated at different sampling frequencies, again the ref_count will make sure the two DAIs can be used concurrently.
And last the SoundWire Intel require power-up/down and bank switch to be handled with a lock already taken, so the 'eml_lock' is made optional with the _unlocked versions of the helpers.
Note that the _check_power_active() implementation is similar to previous helpers in sound/hda/ext, with sleep duration and timeout aligned with hardware recommendations. If desired, this helper could be modified in a second step with .e.g. readl_poll_timeout()
Signed-off-by: Pierre-Louis Bossart pierre-louis.bossart@linux.intel.com Reviewed-by: Rander Wang rander.wang@intel.com Reviewed-by: Péter Ujfalusi peter.ujfalusi@linux.intel.com Reviewed-by: Ranjani Sridharan ranjani.sridharan@linux.intel.com Signed-off-by: Peter Ujfalusi peter.ujfalusi@linux.intel.com --- include/sound/hda-mlink.h | 32 +++++++ sound/soc/sof/intel/hda-mlink.c | 163 ++++++++++++++++++++++++++++++++ 2 files changed, 195 insertions(+)
diff --git a/include/sound/hda-mlink.h b/include/sound/hda-mlink.h index 8048bf01c133..6ecb4c29e472 100644 --- a/include/sound/hda-mlink.h +++ b/include/sound/hda-mlink.h @@ -12,6 +12,13 @@ struct hdac_bus;
int hda_bus_ml_init(struct hdac_bus *bus); void hda_bus_ml_free(struct hdac_bus *bus); + +int hdac_bus_eml_power_up(struct hdac_bus *bus, bool alt, int elid, int sublink); +int hdac_bus_eml_power_up_unlocked(struct hdac_bus *bus, bool alt, int elid, int sublink); + +int hdac_bus_eml_power_down(struct hdac_bus *bus, bool alt, int elid, int sublink); +int hdac_bus_eml_power_down_unlocked(struct hdac_bus *bus, bool alt, int elid, int sublink); + void hda_bus_ml_put_all(struct hdac_bus *bus); void hda_bus_ml_reset_losidv(struct hdac_bus *bus); int hda_bus_ml_resume(struct hdac_bus *bus); @@ -23,6 +30,31 @@ static inline int hda_bus_ml_init(struct hdac_bus *bus) { return 0; }
static inline void hda_bus_ml_free(struct hdac_bus *bus) { } + +static inline int +hdac_bus_eml_power_up(struct hdac_bus *bus, bool alt, int elid, int sublink) +{ + return 0; +} + +static inline int +hdac_bus_eml_power_up_unlocked(struct hdac_bus *bus, bool alt, int elid, int sublink) +{ + return 0; +} + +static inline int +hdac_bus_eml_power_down(struct hdac_bus *bus, bool alt, int elid, int sublink) +{ + return 0; +} + +static inline int +hdac_bus_eml_power_down_unlocked(struct hdac_bus *bus, bool alt, int elid, int sublink) +{ + return 0; +} + static inline void hda_bus_ml_put_all(struct hdac_bus *bus) { } static inline void hda_bus_ml_reset_losidv(struct hdac_bus *bus) { } static inline int hda_bus_ml_resume(struct hdac_bus *bus) { return 0; } diff --git a/sound/soc/sof/intel/hda-mlink.c b/sound/soc/sof/intel/hda-mlink.c index 8a66c0a67589..4d016f6ab773 100644 --- a/sound/soc/sof/intel/hda-mlink.c +++ b/sound/soc/sof/intel/hda-mlink.c @@ -170,6 +170,68 @@ static int hdaml_lnk_enum(struct device *dev, struct hdac_ext2_link *h2link, return 0; }
+/* + * Hardware recommendations are to wait ~10us before checking any hardware transition + * reported by bits changing status. + * This value does not need to be super-precise, a slack of 5us is perfectly acceptable. + * The worst-case is about 1ms before reporting an issue + */ +#define HDAML_POLL_DELAY_MIN_US 10 +#define HDAML_POLL_DELAY_SLACK_US 5 +#define HDAML_POLL_DELAY_RETRY 100 + +static int check_sublink_power(u32 __iomem *lctl, int sublink, bool enabled) +{ + int mask = BIT(sublink) << AZX_ML_LCTL_CPA_SHIFT; + int retry = HDAML_POLL_DELAY_RETRY; + u32 val; + + usleep_range(HDAML_POLL_DELAY_MIN_US, + HDAML_POLL_DELAY_MIN_US + HDAML_POLL_DELAY_SLACK_US); + do { + val = readl(lctl); + if (enabled) { + if (val & mask) + return 0; + } else { + if (!(val & mask)) + return 0; + } + usleep_range(HDAML_POLL_DELAY_MIN_US, + HDAML_POLL_DELAY_MIN_US + HDAML_POLL_DELAY_SLACK_US); + + } while (--retry); + + return -EIO; +} + +static int hdaml_link_init(u32 __iomem *lctl, int sublink) +{ + u32 val; + u32 mask = BIT(sublink) << AZX_ML_LCTL_SPA_SHIFT; + + val = readl(lctl); + val |= mask; + + writel(val, lctl); + + return check_sublink_power(lctl, sublink, true); +} + +static int hdaml_link_shutdown(u32 __iomem *lctl, int sublink) +{ + u32 val; + u32 mask; + + val = readl(lctl); + mask = BIT(sublink) << AZX_ML_LCTL_SPA_SHIFT; + val &= ~mask; + + writel(val, lctl); + + return check_sublink_power(lctl, sublink, false); +} + /* END HDAML section */
static int hda_ml_alloc_h2link(struct hdac_bus *bus, int index) @@ -251,6 +313,107 @@ void hda_bus_ml_free(struct hdac_bus *bus) } EXPORT_SYMBOL_NS(hda_bus_ml_free, SND_SOC_SOF_HDA_MLINK);
+static struct hdac_ext2_link * +find_ext2_link(struct hdac_bus *bus, bool alt, int elid) +{ + struct hdac_ext_link *hlink; + + list_for_each_entry(hlink, &bus->hlink_list, list) { + struct hdac_ext2_link *h2link = hdac_ext_link_to_ext2(hlink); + + if (h2link->alt == alt && h2link->elid == elid) + return h2link; + } + + return NULL; +} + +static int hdac_bus_eml_power_up_base(struct hdac_bus *bus, bool alt, int elid, int sublink, + bool eml_lock) +{ + struct hdac_ext2_link *h2link; + struct hdac_ext_link *hlink; + int ret = 0; + + h2link = find_ext2_link(bus, alt, elid); + if (!h2link) + return -ENODEV; + + if (sublink >= h2link->slcount) + return -EINVAL; + + hlink = &h2link->hext_link; + + if (eml_lock) + mutex_lock(&h2link->eml_lock); + + if (++hlink->ref_count > 1) + goto skip_init; + + ret = hdaml_link_init(hlink->ml_addr + AZX_REG_ML_LCTL, sublink); + +skip_init: + if (eml_lock) + mutex_unlock(&h2link->eml_lock); + + return ret; +} + +int hdac_bus_eml_power_up(struct hdac_bus *bus, bool alt, int elid, int sublink) +{ + return hdac_bus_eml_power_up_base(bus, alt, elid, sublink, true); +} +EXPORT_SYMBOL_NS(hdac_bus_eml_power_up, SND_SOC_SOF_HDA_MLINK); + +int hdac_bus_eml_power_up_unlocked(struct hdac_bus *bus, bool alt, int elid, int sublink) +{ + return hdac_bus_eml_power_up_base(bus, alt, elid, sublink, false); +} +EXPORT_SYMBOL_NS(hdac_bus_eml_power_up_unlocked, SND_SOC_SOF_HDA_MLINK); + +static int hdac_bus_eml_power_down_base(struct hdac_bus *bus, bool alt, int elid, int sublink, + bool eml_lock) +{ + struct hdac_ext2_link *h2link; + struct hdac_ext_link *hlink; + int ret = 0; + + h2link = find_ext2_link(bus, alt, elid); + if (!h2link) + return -ENODEV; + + if (sublink >= h2link->slcount) + return -EINVAL; + + hlink = &h2link->hext_link; + + if (eml_lock) + mutex_lock(&h2link->eml_lock); + + if (--hlink->ref_count > 0) + goto skip_shutdown; + + ret = hdaml_link_shutdown(hlink->ml_addr + AZX_REG_ML_LCTL, sublink); + +skip_shutdown: + if (eml_lock) + mutex_unlock(&h2link->eml_lock); + + return ret; +} + +int hdac_bus_eml_power_down(struct hdac_bus *bus, bool alt, int elid, int sublink) +{ + return hdac_bus_eml_power_down_base(bus, alt, elid, sublink, true); +} +EXPORT_SYMBOL_NS(hdac_bus_eml_power_down, SND_SOC_SOF_HDA_MLINK); + +int hdac_bus_eml_power_down_unlocked(struct hdac_bus *bus, bool alt, int elid, int sublink) +{ + return hdac_bus_eml_power_down_base(bus, alt, elid, sublink, false); +} +EXPORT_SYMBOL_NS(hdac_bus_eml_power_down_unlocked, SND_SOC_SOF_HDA_MLINK); + void hda_bus_ml_put_all(struct hdac_bus *bus) { struct hdac_ext_link *hlink;