From: Pierre-Louis Bossart <pierre-louis.bossart@linux.intel.com>
To: alsa-devel@alsa-project.org
Cc: linux-kernel@vger.kernel.org, tiwai@suse.de, broonie@kernel.org,
vkoul@kernel.org, gregkh@linuxfoundation.org, jank@cadence.com,
srinivas.kandagatla@linaro.org, slawomir.blauciak@intel.com,
Bard liao <yung-chuan.liao@linux.intel.com>,
Rander Wang <rander.wang@linux.intel.com>,
Ranjani Sridharan <ranjani.sridharan@linux.intel.com>,
Hui Wang <hui.wang@canonical.com>,
Pierre-Louis Bossart <pierre-louis.bossart@linux.intel.com>,
Sanyog Kale <sanyog.r.kale@intel.com>
Subject: [PATCH 10/16] soundwire: cadence: make SSP interval programmable
Date: Wed, 11 Mar 2020 13:41:22 -0500 [thread overview]
Message-ID: <20200311184128.4212-11-pierre-louis.bossart@linux.intel.com> (raw)
In-Reply-To: <20200311184128.4212-1-pierre-louis.bossart@linux.intel.com>
In multi-master mode, the IP will only accept SSP intervals with
integer relationships between the frame rate and the gsync frequency.
E.g for a 48kHz frame rate and 4 kHz gsync signal, the SSP interval
can only be 1, 2, 3, 4, 6, 12.
To simplify we only allow one SSP per gsync interval.
Signed-off-by: Pierre-Louis Bossart <pierre-louis.bossart@linux.intel.com>
---
drivers/soundwire/cadence_master.c | 7 ++++---
drivers/soundwire/cadence_master.h | 3 +++
2 files changed, 7 insertions(+), 3 deletions(-)
diff --git a/drivers/soundwire/cadence_master.c b/drivers/soundwire/cadence_master.c
index 91fe89a246ee..4a7e7329ff0d 100644
--- a/drivers/soundwire/cadence_master.c
+++ b/drivers/soundwire/cadence_master.c
@@ -183,7 +183,6 @@ MODULE_PARM_DESC(cdns_mcp_int_mask, "Cadence MCP IntMask");
#define CDNS_PDI_CONFIG_PORT GENMASK(4, 0)
/* Driver defaults */
-#define CDNS_DEFAULT_SSP_INTERVAL 0x18
#define CDNS_TX_TIMEOUT 2000
#define CDNS_SCP_RX_FIFOLEVEL 0x2
@@ -1048,6 +1047,7 @@ static void cdns_init_clock_ctrl(struct sdw_cdns *cdns)
struct sdw_bus *bus = &cdns->bus;
struct sdw_master_prop *prop = &bus->prop;
u32 val;
+ u32 ssp_interval;
int divider;
/* Set clock divider */
@@ -1067,8 +1067,9 @@ static void cdns_init_clock_ctrl(struct sdw_cdns *cdns)
cdns_writel(cdns, CDNS_MCP_FRAME_SHAPE_INIT, val);
/* Set SSP interval to default value */
- cdns_writel(cdns, CDNS_MCP_SSP_CTRL0, CDNS_DEFAULT_SSP_INTERVAL);
- cdns_writel(cdns, CDNS_MCP_SSP_CTRL1, CDNS_DEFAULT_SSP_INTERVAL);
+ ssp_interval = prop->default_frame_rate / SDW_CADENCE_GSYNC_HZ;
+ cdns_writel(cdns, CDNS_MCP_SSP_CTRL0, ssp_interval);
+ cdns_writel(cdns, CDNS_MCP_SSP_CTRL1, ssp_interval);
}
/**
diff --git a/drivers/soundwire/cadence_master.h b/drivers/soundwire/cadence_master.h
index e8fa5c7e09f4..b410656f8194 100644
--- a/drivers/soundwire/cadence_master.h
+++ b/drivers/soundwire/cadence_master.h
@@ -5,6 +5,9 @@
#ifndef __SDW_CADENCE_H
#define __SDW_CADENCE_H
+#define SDW_CADENCE_GSYNC_KHZ 4 /* 4 kHz */
+#define SDW_CADENCE_GSYNC_HZ (SDW_CADENCE_GSYNC_KHZ * 1000)
+
/**
* struct sdw_cdns_pdi: PDI (Physical Data Interface) instance
*
--
2.20.1
next prev parent reply other threads:[~2020-03-11 18:42 UTC|newest]
Thread overview: 27+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-03-11 18:41 [PATCH 00/16] SoundWire: cadence: add clock stop and fix programming sequences Pierre-Louis Bossart
2020-03-11 18:41 ` [PATCH 01/16] soundwire: cadence: s/update_config/config_update Pierre-Louis Bossart
2020-03-11 18:41 ` [PATCH 02/16] soundwire: cadence: simplifiy cdns_init() Pierre-Louis Bossart
2020-03-11 18:41 ` [PATCH 03/16] soundwire: cadence: add interface to check clock status Pierre-Louis Bossart
2020-03-13 12:06 ` Vinod Koul
2020-03-13 16:31 ` Pierre-Louis Bossart
2020-03-14 9:50 ` Vinod Koul
2020-03-11 18:41 ` [PATCH 04/16] soundwire: cadence: handle error cases with CONFIG_UPDATE Pierre-Louis Bossart
2020-03-13 12:08 ` Vinod Koul
2020-03-13 17:09 ` Pierre-Louis Bossart
2020-03-11 18:41 ` [PATCH 05/16] soundwire: cadence: add clock_stop/restart routines Pierre-Louis Bossart
2020-03-13 12:21 ` Vinod Koul
2020-03-13 17:07 ` Pierre-Louis Bossart
2020-03-14 9:52 ` Vinod Koul
2020-03-11 18:41 ` [PATCH 06/16] soundwire: cadence: fix a io timeout issue in S3 test Pierre-Louis Bossart
2020-03-11 18:41 ` [PATCH 07/16] soundwire: cadence: mask Slave interrupt before stopping clock Pierre-Louis Bossart
2020-03-13 12:24 ` Vinod Koul
2020-03-13 16:33 ` Pierre-Louis Bossart
2020-03-11 18:41 ` [PATCH 08/16] soundwire: cadence: merge routines to clear/set bits Pierre-Louis Bossart
2020-03-11 18:41 ` [PATCH 09/16] soundwire: cadence: move clock/SSP related inits to dedicated function Pierre-Louis Bossart
2020-03-11 18:41 ` Pierre-Louis Bossart [this message]
2020-03-11 18:41 ` [PATCH 11/16] soundwire: cadence: reorder MCP_CONFIG settings Pierre-Louis Bossart
2020-03-11 18:41 ` [PATCH 12/16] soundwire: cadence: enable NORMAL operation in cdns_init() Pierre-Louis Bossart
2020-03-11 18:41 ` [PATCH 13/16] soundwire: cadence: remove PREQ_DELAY assignment Pierre-Louis Bossart
2020-03-11 18:41 ` [PATCH 14/16] soundwire: cadence: remove automatic command retries Pierre-Louis Bossart
2020-03-11 18:41 ` [PATCH 15/16] soundwire: cadence: commit changes in the exit_reset() sequence Pierre-Louis Bossart
2020-03-11 18:41 ` [PATCH 16/16] soundwire: cadence: multi-link support Pierre-Louis Bossart
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