linux-kernel - [PATCH V8 3/8] i2c: i2c-qcom-geni: Add interconnect support

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Date:   Tue, 23 Jun 2020 16:08:52 +0530
From:   Akash Asthana <akashast@...eaurora.org>
To:     gregkh@...uxfoundation.org, agross@...nel.org,
        bjorn.andersson@...aro.org, wsa@...-dreams.de, broonie@...nel.org
Cc:     linux-i2c@...r.kernel.org, linux-spi@...r.kernel.org,
        devicetree@...r.kernel.org, swboyd@...omium.org,
        mgautam@...eaurora.org, linux-arm-msm@...r.kernel.org,
        linux-serial@...r.kernel.org, mka@...omium.org,
        dianders@...omium.org, evgreen@...eaurora.org,
        linux-kernel@...r.kernel.org,
        Akash Asthana <akashast@...eaurora.org>
Subject: [PATCH V8 3/8] i2c: i2c-qcom-geni: Add interconnect support

Get the interconnect paths for I2C based Serial Engine device
and vote according to the bus speed of the driver.

Signed-off-by: Akash Asthana <akashast@...eaurora.org>
Reviewed-by: Matthias Kaehlcke <mka@...omium.org>
Acked-by: Wolfram Sang <wsa@...nel.org>
---
Changes in V2:
 - As per Bjorn's comment, removed se == NULL check from geni_i2c_icc_get
 - As per Bjorn's comment, removed code to set se->icc_path* to NULL in failure
 - As per Bjorn's comment, introduced and using devm_of_icc_get API for getting
   path handle
 - As per Matthias comment, added error handling for icc_set_bw call

Changes in V3:
 - As per Matthias comment, use common library APIs defined in geni-se
   driver for ICC functionality.

Changes in V4:
 - Move peak_bw guess as twice of avg_bw if nothing mentioned explicitly
   to ICC core.

Changes in V5:
 - Use icc_enable/disable in power on/off call.

Changes in V6:
 - No changes

Changes in V7:
 - As per Matthias's comment removed usage of peak_bw variable because we don't
   have explicit peak requirement, we were voting peak = avg and this can be
   tracked using single variable for avg bw.

Changes in V8:
 - No change.

 drivers/i2c/busses/i2c-qcom-geni.c | 26 +++++++++++++++++++++++++-
 1 file changed, 25 insertions(+), 1 deletion(-)

diff --git a/drivers/i2c/busses/i2c-qcom-geni.c b/drivers/i2c/busses/i2c-qcom-geni.c
index 18d1e4f..32b2a99 100644
--- a/drivers/i2c/busses/i2c-qcom-geni.c
+++ b/drivers/i2c/busses/i2c-qcom-geni.c
@@ -557,6 +557,22 @@ static int geni_i2c_probe(struct platform_device *pdev)
 	gi2c->adap.dev.of_node = dev->of_node;
 	strlcpy(gi2c->adap.name, "Geni-I2C", sizeof(gi2c->adap.name));
 
+	ret = geni_icc_get(&gi2c->se, "qup-memory");
+	if (ret)
+		return ret;
+	/*
+	 * Set the bus quota for core and cpu to a reasonable value for
+	 * register access.
+	 * Set quota for DDR based on bus speed.
+	 */
+	gi2c->se.icc_paths[GENI_TO_CORE].avg_bw = GENI_DEFAULT_BW;
+	gi2c->se.icc_paths[CPU_TO_GENI].avg_bw = GENI_DEFAULT_BW;
+	gi2c->se.icc_paths[GENI_TO_DDR].avg_bw = Bps_to_icc(gi2c->clk_freq_out);
+
+	ret = geni_icc_set_bw(&gi2c->se);
+	if (ret)
+		return ret;
+
 	ret = geni_se_resources_on(&gi2c->se);
 	if (ret) {
 		dev_err(dev, "Error turning on resources %d\n", ret);
@@ -579,6 +595,10 @@ static int geni_i2c_probe(struct platform_device *pdev)
 		return ret;
 	}
 
+	ret = geni_icc_disable(&gi2c->se);
+	if (ret)
+		return ret;
+
 	dev_dbg(dev, "i2c fifo/se-dma mode. fifo depth:%d\n", tx_depth);
 
 	gi2c->suspended = 1;
@@ -623,7 +643,7 @@ static int __maybe_unused geni_i2c_runtime_suspend(struct device *dev)
 		gi2c->suspended = 1;
 	}
 
-	return 0;
+	return geni_icc_disable(&gi2c->se);
 }
 
 static int __maybe_unused geni_i2c_runtime_resume(struct device *dev)
@@ -631,6 +651,10 @@ static int __maybe_unused geni_i2c_runtime_resume(struct device *dev)
 	int ret;
 	struct geni_i2c_dev *gi2c = dev_get_drvdata(dev);
 
+	ret = geni_icc_enable(&gi2c->se);
+	if (ret)
+		return ret;
+
 	ret = geni_se_resources_on(&gi2c->se);
 	if (ret)
 		return ret;
-- 
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