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soundwire: intel: add abstraction for cmdsync check

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If we add one more callback, we can have common bank switch sequences
between old and new hardware: the only difference is where the CMDSYNC
register is located.

Signed-off-by: Pierre-Louis Bossart <pierre-louis.bossart@linux.intel.com>
Reviewed-by: Rander Wang <rander.wang@intel.com>
Signed-off-by: Bard Liao <yung-chuan.liao@linux.intel.com>
Link: https://lore.kernel.org/r/20230314015410.487311-10-yung-chuan.liao@linux.intel.com
Signed-off-by: Vinod Koul <vkoul@kernel.org>
This commit is contained in:
Pierre-Louis Bossart 2023-03-14 09:54:03 +08:00 committed by Vinod Koul
parent 1a1a6a692e
commit 1e76de2e5d
3 changed files with 23 additions and 11 deletions
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24
drivers/soundwire/intel.c
View File

@ -325,6 +325,15 @@ static void intel_shim_wake(struct sdw_intel *sdw, bool wake_enable)
mutex_unlock(sdw->link_res->shim_lock);
}
static bool intel_check_cmdsync_unlocked(struct sdw_intel *sdw)
{
void __iomem *shim = sdw->link_res->shim;
int sync_reg;
sync_reg = intel_readl(shim, SDW_SHIM_SYNC);
return !!(sync_reg & SDW_SHIM_SYNC_CMDSYNC_MASK);
}
static int intel_link_power_up(struct sdw_intel *sdw)
{
unsigned int link_id = sdw->instance;
@ -695,8 +704,7 @@ static int intel_post_bank_switch(struct sdw_intel *sdw)
{
struct sdw_cdns *cdns = &sdw->cdns;
struct sdw_bus *bus = &cdns->bus;
void __iomem *shim = sdw->link_res->shim;
int sync_reg, ret;
int ret = 0;
/* Write to register only for multi-link */
if (!bus->multi_link)
@ -704,9 +712,6 @@ static int intel_post_bank_switch(struct sdw_intel *sdw)
mutex_lock(sdw->link_res->shim_lock);
/* Read SYNC register */
sync_reg = intel_readl(shim, SDW_SHIM_SYNC);
/*
* post_bank_switch() ops is called from the bus in loop for
* all the Masters in the steam with the expectation that
@ -715,13 +720,9 @@ static int intel_post_bank_switch(struct sdw_intel *sdw)
*
* So, set the SYNCGO bit only if CMDSYNC bit is set for any Master.
*/
if (!(sync_reg & SDW_SHIM_SYNC_CMDSYNC_MASK)) {
ret = 0;
goto unlock;
}
if (sdw_intel_sync_check_cmdsync_unlocked(sdw))
ret = sdw_intel_sync_go_unlocked(sdw);
unlock:
mutex_unlock(sdw->link_res->shim_lock);
if (ret < 0)
@ -1147,6 +1148,7 @@ const struct sdw_intel_hw_ops sdw_intel_cnl_hw_ops = {
.sync_arm = intel_shim_sync_arm,
.sync_go_unlocked = intel_shim_sync_go_unlocked,
.sync_go = intel_shim_sync_go,
.sync_check_cmdsync_unlocked = intel_check_cmdsync_unlocked,
};
EXPORT_SYMBOL_NS(sdw_intel_cnl_hw_ops, SOUNDWIRE_INTEL);

7
drivers/soundwire/intel.h
View File

@ -187,6 +187,13 @@ static inline int sdw_intel_sync_go(struct sdw_intel *sdw)
return -ENOTSUPP;
}
static inline bool sdw_intel_sync_check_cmdsync_unlocked(struct sdw_intel *sdw)
{
if (SDW_INTEL_CHECK_OPS(sdw, sync_check_cmdsync_unlocked))
return SDW_INTEL_OPS(sdw, sync_check_cmdsync_unlocked)(sdw);
return false;
}
/* common bus management */
int intel_start_bus(struct sdw_intel *sdw);
int intel_start_bus_after_reset(struct sdw_intel *sdw);

3
include/linux/soundwire/sdw_intel.h
View File

@ -313,6 +313,8 @@ struct sdw_intel;
* @sync_go_unlocked: helper for multi-link synchronization -
* shim_lock is assumed to be locked at higher level
* @sync_go: helper for multi-link synchronization
* @sync_check_cmdsync_unlocked: helper for multi-link synchronization
* and bank switch - shim_lock is assumed to be locked at higher level
*/
struct sdw_intel_hw_ops {
void (*debugfs_init)(struct sdw_intel *sdw);
@ -338,6 +340,7 @@ struct sdw_intel_hw_ops {
void (*sync_arm)(struct sdw_intel *sdw);
int (*sync_go_unlocked)(struct sdw_intel *sdw);
int (*sync_go)(struct sdw_intel *sdw);
bool (*sync_check_cmdsync_unlocked)(struct sdw_intel *sdw);
};
extern const struct sdw_intel_hw_ops sdw_intel_cnl_hw_ops;