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soundwire: bus: use quirk to filter out invalid parity errors 

If a Slave device reports with a quirk that its initial parity check
may be incorrect, filter it but keep the parity checks active in
steady state.

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: Kai Vehmanen <kai.vehmanen@linux.intel.com>
Reviewed-by: Guennadi Liakhovetski <guennadi.liakhovetski@linux.intel.com>
Link: https://lore.kernel.org/r/20200908134521.6781-5-yung-chuan.liao@linux.intel.com
Signed-off-by: Vinod Koul <vkoul@kernel.org>
This commit is contained in:
Pierre-Louis Bossart 2020-09-08 21:45:18 +08:00 committed by Vinod Koul
parent c2819e196b
commit 4724f12c13
2 changed files with 11 additions and 1 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

8
drivers/soundwire/bus.c
View File

@ -1362,6 +1362,8 @@ static int sdw_handle_slave_alerts(struct sdw_slave *slave)
unsigned long port;
bool slave_notify = false;
u8 buf, buf2[2], _buf, _buf2[2];
bool parity_check;
bool parity_quirk;
sdw_modify_slave_status(slave, SDW_SLAVE_ALERT);
@ -1394,7 +1396,11 @@ static int sdw_handle_slave_alerts(struct sdw_slave *slave)
* interrupt
*/
if (buf & SDW_SCP_INT1_PARITY) {
if (slave->prop.scp_int1_mask & SDW_SCP_INT1_PARITY)
parity_check = slave->prop.scp_int1_mask & SDW_SCP_INT1_PARITY;
parity_quirk = !slave->first_interrupt_done &&
(slave->prop.quirks & SDW_SLAVE_QUIRKS_INVALID_INITIAL_PARITY);
if (parity_check && !parity_quirk)
dev_err(&slave->dev, "Parity error detected\n");
clear |= SDW_SCP_INT1_PARITY;
}

4
include/linux/soundwire/sdw.h
View File

@ -358,6 +358,7 @@ struct sdw_dpn_prop {
* @src_dpn_prop: Source Data Port N properties
* @sink_dpn_prop: Sink Data Port N properties
* @scp_int1_mask: SCP_INT1_MASK desired settings
* @quirks: bitmask identifying deltas from the MIPI specification
*/
struct sdw_slave_prop {
u32 mipi_revision;
@ -380,8 +381,11 @@ struct sdw_slave_prop {
struct sdw_dpn_prop *src_dpn_prop;
struct sdw_dpn_prop *sink_dpn_prop;
u8 scp_int1_mask;
u32 quirks;
};
#define SDW_SLAVE_QUIRKS_INVALID_INITIAL_PARITY BIT(0)
/**
* struct sdw_master_prop - Master properties
* @revision: MIPI spec version of the implementation