linux-serial.vger.kernel.org archive mirror
 help / color / mirror / Atom feed
From: Akash Asthana <akashast@codeaurora.org>
To: gregkh@linuxfoundation.org, agross@kernel.org,
	bjorn.andersson@linaro.org, wsa@the-dreams.de,
	broonie@kernel.org, mark.rutland@arm.com, robh+dt@kernel.org
Cc: linux-i2c@vger.kernel.org, linux-spi@vger.kernel.org,
	devicetree@vger.kernel.org, swboyd@chromium.org,
	mgautam@codeaurora.org, linux-arm-msm@vger.kernel.org,
	linux-serial@vger.kernel.org, mka@chromium.org,
	dianders@chromium.org, evgreen@chromium.org,
	georgi.djakov@linaro.org, Akash Asthana <akashast@codeaurora.org>
Subject: [PATCH V5 4/7] spi: spi-geni-qcom: Add interconnect support
Date: Fri,  8 May 2020 12:03:36 +0530	[thread overview]
Message-ID: <1588919619-21355-5-git-send-email-akashast@codeaurora.org> (raw)
In-Reply-To: <1588919619-21355-1-git-send-email-akashast@codeaurora.org>

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

Signed-off-by: Akash Asthana <akashast@codeaurora.org>
---
Changes in V2:
 - As per Bjorn's comment, removed se == NULL check from geni_spi_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's comment, use helper ICC function from geni-se driver.

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.
 - Save some non-zero avg/peak value to ICC core by calling geni_icc_set_bw
   from probe so that when resume/icc_enable is called NOC are running at
   some non-zero value. No need to call icc_disable after BW vote because
   device will resume and suspend before probe return and will leave ICC in
   disabled state.

 drivers/spi/spi-geni-qcom.c | 32 +++++++++++++++++++++++++++++++-
 1 file changed, 31 insertions(+), 1 deletion(-)

diff --git a/drivers/spi/spi-geni-qcom.c b/drivers/spi/spi-geni-qcom.c
index c397242..5dfa1fb 100644
--- a/drivers/spi/spi-geni-qcom.c
+++ b/drivers/spi/spi-geni-qcom.c
@@ -234,6 +234,13 @@ static int setup_fifo_params(struct spi_device *spi_slv,
 		return ret;
 	}
 
+	/* Set BW quota for CPU as driver supports FIFO mode only. */
+	geni_icc_bw_init(&se->icc_paths[CPU_TO_GENI],
+				Bps_to_icc(mas->cur_speed_hz), 0);
+	ret = geni_icc_set_bw(se);
+	if (ret)
+		return ret;
+
 	clk_sel = idx & CLK_SEL_MSK;
 	m_clk_cfg = (div << CLK_DIV_SHFT) | SER_CLK_EN;
 	spi_setup_word_len(mas, spi_slv->mode, spi_slv->bits_per_word);
@@ -578,6 +585,19 @@ static int spi_geni_probe(struct platform_device *pdev)
 	spin_lock_init(&mas->lock);
 	pm_runtime_enable(dev);
 
+	ret = geni_icc_get(&mas->se, NULL);
+	if (ret)
+		goto spi_geni_probe_runtime_disable;
+	/* Set the bus quota to a reasonable value for register access */
+	geni_icc_bw_init(&mas->se.icc_paths[GENI_TO_CORE],
+			Bps_to_icc(CORE_2X_50_MHZ), 0);
+	geni_icc_bw_init(&mas->se.icc_paths[CPU_TO_GENI], GENI_DEFAULT_BW, 0);
+
+	/* Set BW for register access */
+	ret = geni_icc_set_bw(&mas->se);
+	if (ret)
+		goto spi_geni_probe_runtime_disable;
+
 	ret = spi_geni_init(mas);
 	if (ret)
 		goto spi_geni_probe_runtime_disable;
@@ -616,14 +636,24 @@ static int __maybe_unused spi_geni_runtime_suspend(struct device *dev)
 {
 	struct spi_master *spi = dev_get_drvdata(dev);
 	struct spi_geni_master *mas = spi_master_get_devdata(spi);
+	int ret;
+
+	ret = geni_se_resources_off(&mas->se);
+	if (ret)
+		return ret;
 
-	return geni_se_resources_off(&mas->se);
+	return geni_icc_disable(&mas->se);
 }
 
 static int __maybe_unused spi_geni_runtime_resume(struct device *dev)
 {
 	struct spi_master *spi = dev_get_drvdata(dev);
 	struct spi_geni_master *mas = spi_master_get_devdata(spi);
+	int ret;
+
+	ret = geni_icc_enable(&mas->se);
+	if (ret)
+		return ret;
 
 	return geni_se_resources_on(&mas->se);
 }
-- 
The Qualcomm Innovation Center, Inc. is a member of the Code Aurora Forum,\na Linux Foundation Collaborative Project

  parent reply	other threads:[~2020-05-08  6:34 UTC|newest]

Thread overview: 27+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-05-08  6:33 [PATCH V5 0/7] Add interconnect support to QSPI and QUP drivers Akash Asthana
2020-05-08  6:33 ` [PATCH V5 1/7] soc: qcom: geni: Support for ICC voting Akash Asthana
2020-05-08 17:13   ` Matthias Kaehlcke
2020-05-12 14:02     ` Akash Asthana
2020-05-08 19:03   ` Matthias Kaehlcke
2020-05-12 14:26     ` Akash Asthana
2020-05-08  6:33 ` [PATCH V5 2/7] soc: qcom-geni-se: Add interconnect support to fix earlycon crash Akash Asthana
2020-05-08 17:59   ` Matthias Kaehlcke
2020-05-08 19:14     ` Matthias Kaehlcke
2020-05-14  7:03       ` Akash Asthana
2020-05-14  6:45     ` Akash Asthana
2020-05-09 12:11   ` Andy Shevchenko
2020-05-14  7:34     ` Akash Asthana
2020-05-08  6:33 ` [PATCH V5 3/7] i2c: i2c-qcom-geni: Add interconnect support Akash Asthana
2020-05-08 18:16   ` Matthias Kaehlcke
2020-05-15 10:03   ` Wolfram Sang
2020-05-08  6:33 ` Akash Asthana [this message]
2020-05-08 10:16   ` [PATCH V5 4/7] spi: spi-geni-qcom: " Mark Brown
2020-05-08 18:25   ` Matthias Kaehlcke
2020-05-14  7:37     ` Akash Asthana
2020-05-08  6:33 ` [PATCH V5 5/7] tty: serial: qcom_geni_serial: " Akash Asthana
2020-05-08 18:38   ` Matthias Kaehlcke
2020-05-08  6:33 ` [PATCH V5 6/7] spi: spi-qcom-qspi: " Akash Asthana
2020-05-08 10:16   ` Mark Brown
2020-05-08 18:53   ` Matthias Kaehlcke
2020-05-18 13:10     ` Akash Asthana
2020-05-08  6:33 ` [PATCH V5 7/7] arm64: dts: sc7180: Add interconnect for QUP and QSPI Akash Asthana

Reply instructions:

You may reply publicly to this message via plain-text email
using any one of the following methods:

* Save the following mbox file, import it into your mail client,
  and reply-to-all from there: mbox

  Avoid top-posting and favor interleaved quoting:
  https://en.wikipedia.org/wiki/Posting_style#Interleaved_style

* Reply using the --to, --cc, and --in-reply-to
  switches of git-send-email(1):

  git send-email \
    --in-reply-to=1588919619-21355-5-git-send-email-akashast@codeaurora.org \
    --to=akashast@codeaurora.org \
    --cc=agross@kernel.org \
    --cc=bjorn.andersson@linaro.org \
    --cc=broonie@kernel.org \
    --cc=devicetree@vger.kernel.org \
    --cc=dianders@chromium.org \
    --cc=evgreen@chromium.org \
    --cc=georgi.djakov@linaro.org \
    --cc=gregkh@linuxfoundation.org \
    --cc=linux-arm-msm@vger.kernel.org \
    --cc=linux-i2c@vger.kernel.org \
    --cc=linux-serial@vger.kernel.org \
    --cc=linux-spi@vger.kernel.org \
    --cc=mark.rutland@arm.com \
    --cc=mgautam@codeaurora.org \
    --cc=mka@chromium.org \
    --cc=robh+dt@kernel.org \
    --cc=swboyd@chromium.org \
    --cc=wsa@the-dreams.de \
    /path/to/YOUR_REPLY

  https://kernel.org/pub/software/scm/git/docs/git-send-email.html

* If your mail client supports setting the In-Reply-To header
  via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).