Currently quirks are only allowed for Slave devices. This patch describes the need for two quirks at the Master level.
a) bus clash The SoundWire specification allows a Slave device to report a bus clash with the in-band interrupt mechanism when it detects a conflict while driving a bitSlot it owns. This can be a symptom of an electrical conflict or a programming error, and it's vital to detect reliably.
Unfortunately, on some platforms, bus clashes are randomly reported by Slave devices after a bus reset, with an interrupt status set even before the bus clash interrupt is enabled. These initial spurious interrupts are not relevant and should optionally be filtered out, while leaving the interrupt mechanism enabled to detect 'true' issues.
This patch suggests the addition of a Master level quirk to discard such interrupts. The quirk should in theory have been added at the Slave level, but since the problem was detected with different generations of Slave devices it's hard to point to a specific IP. The problem might also be board-dependent and hence dealing with a Master quirk is simpler.
b) parity
Additional tests on a new platform with the Maxim 98373 amplifier showed a rare case where the parity interrupt is also thrown on startup, at the same time as bus clashes. This issue only seems to happen infrequently and was only observed during suspend-resume stress tests while audio is streaming. We could make the problem go away by adding a Slave-level quirk, but there is no evidence that the issue is actually a Slave problem: the parity is provided by the Master, which could also set an invalid parity in corner cases.
BugLink: https://github.com/thesofproject/linux/issues/2578 BugLink: https://github.com/thesofproject/linux/issues/2533
Co-developed-by: Pierre-Louis Bossart pierre-louis.bossart@linux.intel.com Signed-off-by: Pierre-Louis Bossart pierre-louis.bossart@linux.intel.com Signed-off-by: Bard Liao yung-chuan.liao@linux.intel.com Reviewed-by: Guennadi Liakhovetski guennadi.liakhovetski@linux.intel.com --- include/linux/soundwire/sdw.h | 22 ++++++++++++++++++++++ 1 file changed, 22 insertions(+)
diff --git a/include/linux/soundwire/sdw.h b/include/linux/soundwire/sdw.h index d08039d65825..25f2a14e2e83 100644 --- a/include/linux/soundwire/sdw.h +++ b/include/linux/soundwire/sdw.h @@ -405,6 +405,7 @@ struct sdw_slave_prop { * command * @mclk_freq: clock reference passed to SoundWire Master, in Hz. * @hw_disabled: if true, the Master is not functional, typically due to pin-mux + * @quirks: bitmask identifying optional behavior beyond the scope of the MIPI specification */ struct sdw_master_prop { u32 revision; @@ -421,8 +422,29 @@ struct sdw_master_prop { u32 err_threshold; u32 mclk_freq; bool hw_disabled; + u64 quirks; };
+/* Definitions for Master quirks */ + +/* + * In a number of platforms bus clashes are reported after a hardware + * reset but without any explanations or evidence of a real problem. + * The following quirk will discard all initial bus clash interrupts + * but will leave the detection on should real bus clashes happen + */ +#define SDW_MASTER_QUIRKS_CLEAR_INITIAL_CLASH BIT(0) + +/* + * Some Slave devices have known issues with incorrect parity errors + * reported after a hardware reset. However during integration unexplained + * parity errors can be reported by Slave devices, possibly due to electrical + * issues at the Master level. + * The following quirk will discard all initial parity errors but will leave + * the detection on should real parity errors happen. + */ +#define SDW_MASTER_QUIRKS_CLEAR_INITIAL_PARITY BIT(1) + int sdw_master_read_prop(struct sdw_bus *bus); int sdw_slave_read_prop(struct sdw_slave *slave);