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soundwire: intel: don't manage link power individually 

Each link has separate power controls, but experimental results show
we need to use an all-or-none approach to the link power management.

This change has marginal power impacts, the DSP needs to be powered
anyways before SoundWire links can be powered, and even when powered a
link can be in clock-stopped mode.

Signed-off-by: Pierre-Louis Bossart <pierre-louis.bossart@linux.intel.com>
Signed-off-by: Bard Liao <yung-chuan.liao@linux.intel.com>
Link: https://lore.kernel.org/r/20200901150556.19432-11-yung-chuan.liao@linux.intel.com
Signed-off-by: Vinod Koul <vkoul@kernel.org>
This commit is contained in:
Pierre-Louis Bossart 2020-09-01 23:05:56 +08:00 committed by Vinod Koul
parent de763fa888
commit 5ee74eb280
1 changed files with 46 additions and 24 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

70
drivers/soundwire/intel.c
View File

@ -63,7 +63,9 @@ MODULE_PARM_DESC(sdw_md_flags, "SoundWire Intel Master device flags (0x0 all off
#define SDW_SHIM_WAKESTS 0x192
#define SDW_SHIM_LCTL_SPA BIT(0)
#define SDW_SHIM_LCTL_SPA_MASK GENMASK(3, 0)
#define SDW_SHIM_LCTL_CPA BIT(8)
#define SDW_SHIM_LCTL_CPA_MASK GENMASK(11, 8)
#define SDW_SHIM_SYNC_SYNCPRD_VAL_24 (24000 / SDW_CADENCE_GSYNC_KHZ - 1)
#define SDW_SHIM_SYNC_SYNCPRD_VAL_38_4 (38400 / SDW_CADENCE_GSYNC_KHZ - 1)
@ -295,8 +297,8 @@ static int intel_link_power_up(struct sdw_intel *sdw)
u32 *shim_mask = sdw->link_res->shim_mask;
struct sdw_bus *bus = &sdw->cdns.bus;
struct sdw_master_prop *prop = &bus->prop;
int spa_mask, cpa_mask;
int link_control;
u32 spa_mask, cpa_mask;
u32 link_control;
int ret = 0;
u32 syncprd;
u32 sync_reg;
@ -319,6 +321,8 @@ static int intel_link_power_up(struct sdw_intel *sdw)
syncprd = SDW_SHIM_SYNC_SYNCPRD_VAL_24;
if (!*shim_mask) {
dev_dbg(sdw->cdns.dev, "%s: powering up all links\n", __func__);
/* we first need to program the SyncPRD/CPU registers */
dev_dbg(sdw->cdns.dev,
"%s: first link up, programming SYNCPRD\n", __func__);
@ -331,21 +335,24 @@ static int intel_link_power_up(struct sdw_intel *sdw)
/* Set SyncCPU bit */
sync_reg |= SDW_SHIM_SYNC_SYNCCPU;
intel_writel(shim, SDW_SHIM_SYNC, sync_reg);
}
/* Link power up sequence */
link_control = intel_readl(shim, SDW_SHIM_LCTL);
spa_mask = (SDW_SHIM_LCTL_SPA << link_id);
cpa_mask = (SDW_SHIM_LCTL_CPA << link_id);
link_control |= spa_mask;
/* Link power up sequence */
link_control = intel_readl(shim, SDW_SHIM_LCTL);
ret = intel_set_bit(shim, SDW_SHIM_LCTL, link_control, cpa_mask);
if (ret < 0) {
dev_err(sdw->cdns.dev, "Failed to power up link: %d\n", ret);
goto out;
}
/* only power-up enabled links */
spa_mask = sdw->link_res->link_mask <<
SDW_REG_SHIFT(SDW_SHIM_LCTL_SPA_MASK);
cpa_mask = sdw->link_res->link_mask <<
SDW_REG_SHIFT(SDW_SHIM_LCTL_CPA_MASK);
link_control |= spa_mask;
ret = intel_set_bit(shim, SDW_SHIM_LCTL, link_control, cpa_mask);
if (ret < 0) {
dev_err(sdw->cdns.dev, "Failed to power up link: %d\n", ret);
goto out;
}
if (!*shim_mask) {
/* SyncCPU will change once link is active */
ret = intel_wait_bit(shim, SDW_SHIM_SYNC,
SDW_SHIM_SYNC_SYNCCPU, 0);
@ -483,7 +490,7 @@ static void intel_shim_wake(struct sdw_intel *sdw, bool wake_enable)
static int intel_link_power_down(struct sdw_intel *sdw)
{
int link_control, spa_mask, cpa_mask;
u32 link_control, spa_mask, cpa_mask;
unsigned int link_id = sdw->instance;
void __iomem *shim = sdw->link_res->shim;
u32 *shim_mask = sdw->link_res->shim_mask;
@ -493,24 +500,39 @@ static int intel_link_power_down(struct sdw_intel *sdw)
intel_shim_master_ip_to_glue(sdw);
/* Link power down sequence */
link_control = intel_readl(shim, SDW_SHIM_LCTL);
spa_mask = ~(SDW_SHIM_LCTL_SPA << link_id);
cpa_mask = (SDW_SHIM_LCTL_CPA << link_id);
link_control &= spa_mask;
ret = intel_clear_bit(shim, SDW_SHIM_LCTL, link_control, cpa_mask);
if (!(*shim_mask & BIT(link_id)))
dev_err(sdw->cdns.dev,
"%s: Unbalanced power-up/down calls\n", __func__);
*shim_mask &= ~BIT(link_id);
if (!*shim_mask) {
dev_dbg(sdw->cdns.dev, "%s: powering down all links\n", __func__);
/* Link power down sequence */
link_control = intel_readl(shim, SDW_SHIM_LCTL);
/* only power-down enabled links */
spa_mask = (~sdw->link_res->link_mask) <<
SDW_REG_SHIFT(SDW_SHIM_LCTL_SPA_MASK);
cpa_mask = sdw->link_res->link_mask <<
SDW_REG_SHIFT(SDW_SHIM_LCTL_CPA_MASK);
link_control &= spa_mask;
ret = intel_clear_bit(shim, SDW_SHIM_LCTL, link_control, cpa_mask);
}
link_control = intel_readl(shim, SDW_SHIM_LCTL);
mutex_unlock(sdw->link_res->shim_lock);
if (ret < 0)
if (ret < 0) {
dev_err(sdw->cdns.dev, "%s: could not power down link\n", __func__);
return ret;
}
sdw->cdns.link_up = false;
return 0;