Re: [PATCH V3 4/8] i2c: i2c-qcom-geni: Add interconnect support

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Hi  Matthias,

On 4/1/2020 12:19 AM, Matthias Kaehlcke wrote:
Hi Akash,

On Tue, Mar 31, 2020 at 04:39:32PM +0530, Akash Asthana wrote:
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@xxxxxxxxxxxxxx>
---
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.

  drivers/i2c/busses/i2c-qcom-geni.c | 30 +++++++++++++++++++++++++++++-
  1 file changed, 29 insertions(+), 1 deletion(-)

diff --git a/drivers/i2c/busses/i2c-qcom-geni.c b/drivers/i2c/busses/i2c-qcom-geni.c
index 18d1e4f..373c2ca 100644
--- a/drivers/i2c/busses/i2c-qcom-geni.c
+++ b/drivers/i2c/busses/i2c-qcom-geni.c
@@ -557,6 +557,26 @@ 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-core", "qup-config", "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, assume peak requirement
+	 * as twice of avg bw.
+	 */
+	gi2c->se.to_core.avg_bw = GENI_DEFAULT_BW;
+	gi2c->se.to_core.peak_bw = Bps_to_icc(CORE_2X_100_MHZ);
+	gi2c->se.from_cpu.avg_bw = GENI_DEFAULT_BW;
+	gi2c->se.from_cpu.peak_bw = GENI_DEFAULT_BW;
+	gi2c->se.to_ddr.avg_bw = Bps_to_icc(gi2c->clk_freq_out);
+	gi2c->se.to_ddr.peak_bw = Bps_to_icc(2 * gi2c->clk_freq_out);
+
+	ret = geni_icc_vote_on(&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);
I think you need to call geni_icc_vote_off() here and in other error paths.

No need to add geni_icc_vote_off() on error paths because we are using devm_of_icc_get to get ICC path handle.

If we are going to fail probe then "devm_icc_release---->icc_put" will set votes to 0 on each path. https://patchwork.kernel.org/patch/11467507/

Regards,

Akash

--
The Qualcomm Innovation Center, Inc. is a member of the Code Aurora Forum,\na Linux Foundation Collaborative Project



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