linux-kernel - [PATCH 1/2] soundwire: cadence_master: set frame shape and divider based on actual clk freq

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Message-ID: <20250107015824.5046-2-yung-chuan.liao@linux.intel.com>
Date: Tue,  7 Jan 2025 09:58:23 +0800
From: Bard Liao <yung-chuan.liao@...ux.intel.com>
To: linux-sound@...r.kernel.org,
	vkoul@...nel.org
Cc: vinod.koul@...aro.org,
	linux-kernel@...r.kernel.org,
	pierre-louis.bossart@...ux.dev,
	bard.liao@...el.com
Subject: [PATCH 1/2] soundwire: cadence_master: set frame shape and divider based on actual clk freq

Frame shape and curr_dr_freq could be updated by sdw_compute_bus_params().
Peripherals will set curr_dr_freq as their frequency. Managers
should do the same. Then update frame shape according to the actual
bus frequency.

Signed-off-by: Bard Liao <yung-chuan.liao@...ux.intel.com>
Reviewed-by: Ranjani Sridharan <ranjani.sridharan@...ux.intel.com>
Reviewed-by: Péter Ujfalusi <peter.ujfalusi@...ux.intel.com>
---
 drivers/soundwire/cadence_master.c | 24 +++++++++++++++++++++---
 1 file changed, 21 insertions(+), 3 deletions(-)

diff --git a/drivers/soundwire/cadence_master.c b/drivers/soundwire/cadence_master.c
index f367670ea991..a49d4e521a8f 100644
--- a/drivers/soundwire/cadence_master.c
+++ b/drivers/soundwire/cadence_master.c
@@ -1341,13 +1341,14 @@ static u32 cdns_set_initial_frame_shape(int n_rows, int n_cols)
 	return val;
 }
 
-static void cdns_init_clock_ctrl(struct sdw_cdns *cdns)
+static int 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;
+	int freq;
 
 	dev_dbg(cdns->dev, "mclk %d max %d row %d col %d\n",
 		prop->mclk_freq,
@@ -1356,13 +1357,25 @@ static void cdns_init_clock_ctrl(struct sdw_cdns *cdns)
 		prop->default_col);
 
 	/* Set clock divider */
-	divider	= (prop->mclk_freq / prop->max_clk_freq) - 1;
+	divider	= (prop->mclk_freq * SDW_DOUBLE_RATE_FACTOR /
+		bus->params.curr_dr_freq) - 1;
+	freq = bus->params.curr_dr_freq >> 1;
 
 	cdns_updatel(cdns, CDNS_MCP_CLK_CTRL0,
 		     CDNS_MCP_CLK_MCLKD_MASK, divider);
 	cdns_updatel(cdns, CDNS_MCP_CLK_CTRL1,
 		     CDNS_MCP_CLK_MCLKD_MASK, divider);
 
+	/* Set frame shape base on the actual bus frequency. */
+	if (!prop->default_frame_rate || !prop->default_row) {
+		dev_err(cdns->dev, "Default frame_rate %d or row %d is invalid\n",
+			prop->default_frame_rate, prop->default_row);
+		return -EINVAL;
+	}
+
+	prop->default_col = freq * SDW_DOUBLE_RATE_FACTOR /
+			    prop->default_frame_rate / prop->default_row;
+
 	/*
 	 * Frame shape changes after initialization have to be done
 	 * with the bank switch mechanism
@@ -1375,6 +1388,8 @@ static void cdns_init_clock_ctrl(struct sdw_cdns *cdns)
 	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);
+
+	return 0;
 }
 
 /**
@@ -1408,9 +1423,12 @@ EXPORT_SYMBOL(sdw_cdns_soft_reset);
  */
 int sdw_cdns_init(struct sdw_cdns *cdns)
 {
+	int ret;
 	u32 val;
 
-	cdns_init_clock_ctrl(cdns);
+	ret = cdns_init_clock_ctrl(cdns);
+	if (ret)
+		return ret;
 
 	sdw_cdns_check_self_clearing_bits(cdns, __func__, false, 0);
 
-- 
2.43.0