soundwire: SDCA: detect sdca_cascade interrupt

The SoundWire 1.2 specification defines an "SDCA cascade" bit which
handles a logical OR of all SDCA interrupt sources (up to 30 defined).

Due to limitations of the addressing space, this bit is located in the
SDW_DP0_INT register when DP0 is used, or alternatively in the
DP0_SDCA_Support_INTSTAT register when DP0 is not used.

To allow for both cases to be handled, this bit will be checked in the
main device-level interrupt handling code. This will result in the
register being read twice if DP0 is enabled, but it's not clear how to
optimize this case. It's also more logical to deal with this interrupt
at the device than the port level, this bit is really not DP0 specific
and its location in the DP0_INTSTAT bit is only due to the lack of
free space in SCP_INTSTAT_1.

The SDCA_Cascade bit cannot be masked or cleared, so the interrupt
handling only forwards the detection to the Slave driver, which will
deal with reading the relevant SDCA status bits and clearing them. The
bus driver only signals the detection.

The communication with the Slave driver is based on the same interrupt
callback, with only an extension to provide the status of the
sdca_cascade bit.

Signed-off-by: Pierre-Louis Bossart <pierre-louis.bossart@linux.intel.com>
Reviewed-by: Rander Wang <rander.wang@linux.intel.com>
Reviewed-by: Guennadi Liakhovetski <guennadi.liakhovetski@linux.intel.com>
Signed-off-by: Bard Liao <yung-chuan.liao@linux.intel.com>
Link: https://lore.kernel.org/r/20201104152358.9518-1-yung-chuan.liao@linux.intel.com
Signed-off-by: Vinod Koul <vkoul@kernel.org>

1 files changed, 4 insertions, 0 deletions

diff --git a/include/linux/soundwire/sdw.h b/include/linux/soundwire/sdw.h
index 41cc1192f9aa..f0b01b728640 100644
--- a/include/linux/soundwire/sdw.h
+++ b/include/linux/soundwire/sdw.h
@@ -359,6 +359,7 @@ struct sdw_dpn_prop {
  * @sink_dpn_prop: Sink Data Port N properties
  * @scp_int1_mask: SCP_INT1_MASK desired settings
  * @quirks: bitmask identifying deltas from the MIPI specification
+ * @is_sdca: the Slave supports the SDCA specification
  */
 struct sdw_slave_prop {
 	u32 mipi_revision;
@@ -382,6 +383,7 @@ struct sdw_slave_prop {
 	struct sdw_dpn_prop *sink_dpn_prop;
 	u8 scp_int1_mask;
 	u32 quirks;
+	bool is_sdca;
 };
 
 #define SDW_SLAVE_QUIRKS_INVALID_INITIAL_PARITY	BIT(0)
@@ -479,10 +481,12 @@ struct sdw_slave_id {
 
 /**
  * struct sdw_slave_intr_status - Slave interrupt status
+ * @sdca_cascade: set if the Slave device reports an SDCA interrupt
  * @control_port: control port status
  * @port: data port status
  */
 struct sdw_slave_intr_status {
+	bool sdca_cascade;
 	u8 control_port;
 	u8 port[15];
 };