From: Bard Liao <yung-chuan.liao@linux.intel.com>
To: linux-sound@vger.kernel.org, vkoul@kernel.org
Cc: vinod.koul@linaro.org, linux-kernel@vger.kernel.org,
pierre-louis.bossart@linux.intel.com, bard.liao@intel.com
Subject: [PATCH 4/7] soundwire: intel: add support for MeteorLake additional clocks
Date: Tue, 26 Mar 2024 09:20:27 +0000 [thread overview]
Message-ID: <20240326092030.1062802-5-yung-chuan.liao@linux.intel.com> (raw)
In-Reply-To: <20240326092030.1062802-1-yung-chuan.liao@linux.intel.com>
From: Pierre-Louis Bossart <pierre-louis.bossart@linux.intel.com>
In the MeteorLake hardware, the SoundWire link clock can be selected
from the Xtal, audio cardinal clock (24.576 MHz) or the 96 MHz audio
PLL.
This patches add the clock selection in a backwards-compatible manner,
using the ACPI firmware as the source of information and checking its
compatibility with hardware capabilities.
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>
---
drivers/soundwire/intel.c | 43 +++++++++++++++++++++++++----
include/linux/soundwire/sdw_intel.h | 5 ++++
2 files changed, 42 insertions(+), 6 deletions(-)
diff --git a/drivers/soundwire/intel.c b/drivers/soundwire/intel.c
index 1287a325c435..e15666962fe4 100644
--- a/drivers/soundwire/intel.c
+++ b/drivers/soundwire/intel.c
@@ -345,8 +345,10 @@ static int intel_link_power_up(struct sdw_intel *sdw)
u32 spa_mask, cpa_mask;
u32 link_control;
int ret = 0;
+ u32 clock_source;
u32 syncprd;
u32 sync_reg;
+ bool lcap_mlcs;
mutex_lock(sdw->link_res->shim_lock);
@@ -358,12 +360,35 @@ static int intel_link_power_up(struct sdw_intel *sdw)
* is only dependent on the oscillator clock provided to
* the IP, so adjust based on _DSD properties reported in DSDT
* tables. The values reported are based on either 24MHz
- * (CNL/CML) or 38.4 MHz (ICL/TGL+).
+ * (CNL/CML) or 38.4 MHz (ICL/TGL+). On MeteorLake additional
+ * frequencies are available with the MLCS clock source selection.
*/
- if (prop->mclk_freq % 6000000)
- syncprd = SDW_SHIM_SYNC_SYNCPRD_VAL_38_4;
- else
- syncprd = SDW_SHIM_SYNC_SYNCPRD_VAL_24;
+ lcap_mlcs = intel_readl(shim, SDW_SHIM_LCAP) & SDW_SHIM_LCAP_MLCS_MASK;
+
+ if (prop->mclk_freq % 6000000) {
+ if (prop->mclk_freq % 2400000) {
+ if (lcap_mlcs) {
+ syncprd = SDW_SHIM_SYNC_SYNCPRD_VAL_24_576;
+ clock_source = SDW_SHIM_MLCS_CARDINAL_CLK;
+ } else {
+ dev_err(sdw->cdns.dev, "%s: invalid clock configuration, mclk %d lcap_mlcs %d\n",
+ __func__, prop->mclk_freq, lcap_mlcs);
+ ret = -EINVAL;
+ goto out;
+ }
+ } else {
+ syncprd = SDW_SHIM_SYNC_SYNCPRD_VAL_38_4;
+ clock_source = SDW_SHIM_MLCS_XTAL_CLK;
+ }
+ } else {
+ if (lcap_mlcs) {
+ syncprd = SDW_SHIM_SYNC_SYNCPRD_VAL_96;
+ clock_source = SDW_SHIM_MLCS_AUDIO_PLL_CLK;
+ } else {
+ syncprd = SDW_SHIM_SYNC_SYNCPRD_VAL_24;
+ clock_source = SDW_SHIM_MLCS_XTAL_CLK;
+ }
+ }
if (!*shim_mask) {
dev_dbg(sdw->cdns.dev, "powering up all links\n");
@@ -403,6 +428,13 @@ static int intel_link_power_up(struct sdw_intel *sdw)
"Failed to set SHIM_SYNC: %d\n", ret);
goto out;
}
+
+ /* update link clock if needed */
+ if (lcap_mlcs) {
+ link_control = intel_readl(shim, SDW_SHIM_LCTL);
+ u32p_replace_bits(&link_control, clock_source, SDW_SHIM_LCTL_MLCS_MASK);
+ intel_writel(shim, SDW_SHIM_LCTL, link_control);
+ }
}
*shim_mask |= BIT(link_id);
@@ -1062,4 +1094,3 @@ const struct sdw_intel_hw_ops sdw_intel_cnl_hw_ops = {
.sync_check_cmdsync_unlocked = intel_check_cmdsync_unlocked,
};
EXPORT_SYMBOL_NS(sdw_intel_cnl_hw_ops, SOUNDWIRE_INTEL);
-
diff --git a/include/linux/soundwire/sdw_intel.h b/include/linux/soundwire/sdw_intel.h
index fa40b85d5019..8e78417156e3 100644
--- a/include/linux/soundwire/sdw_intel.h
+++ b/include/linux/soundwire/sdw_intel.h
@@ -22,6 +22,7 @@
/* LCAP */
#define SDW_SHIM_LCAP 0x0
#define SDW_SHIM_LCAP_LCOUNT_MASK GENMASK(2, 0)
+#define SDW_SHIM_LCAP_MLCS_MASK BIT(8)
/* LCTL */
#define SDW_SHIM_LCTL 0x4
@@ -30,6 +31,10 @@
#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_LCTL_MLCS_MASK GENMASK(29, 27)
+#define SDW_SHIM_MLCS_XTAL_CLK 0x0
+#define SDW_SHIM_MLCS_CARDINAL_CLK 0x1
+#define SDW_SHIM_MLCS_AUDIO_PLL_CLK 0x2
/* SYNC */
#define SDW_SHIM_SYNC 0xC
--
2.34.1
next prev parent reply other threads:[~2024-03-26 9:20 UTC|newest]
Thread overview: 9+ messages / expand[flat|nested] mbox.gz Atom feed top
2024-03-26 9:20 [PATCH 0/7] soundwire: add support for link clock source selection Bard Liao
2024-03-26 9:20 ` [PATCH 1/7] soundwire: cadence: show the bus frequency and frame shape Bard Liao
2024-03-26 9:20 ` [PATCH 2/7] soundwire: bus: extend base clock checks to 96 MHz Bard Liao
2024-03-26 9:20 ` [PATCH 3/7] soundwire: intel: add more values for SYNCPRD Bard Liao
2024-03-26 9:20 ` Bard Liao [this message]
2024-03-26 9:20 ` [PATCH 5/7] soundwire: intel_ace2x: move and extend clock selection Bard Liao
2024-03-26 9:20 ` [PATCH 6/7] soundwire: intel_ace2.x: power-up first before setting SYNCPRD Bard Liao
2024-03-26 9:20 ` [PATCH 7/7] soundwire: intel_ace2x: set the clock source Bard Liao
2024-04-05 11:52 ` [PATCH 0/7] soundwire: add support for link clock source selection Vinod Koul
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