From: cchiluve <cchiluve@codeaurora.org>
To: balbi@kernel.org, agross@kernel.org, david.brown@linaro.org
Cc: linux-usb@vger.kernel.org,
Chandana Kishori Chiluveru <cchiluve@codeaurora.org>
Subject: [PATCH V4 2/3] usb: dwc3: qcom: Add interconnect support in dwc3 driver
Date: Fri, 20 Sep 2019 18:23:16 +0530 [thread overview]
Message-ID: <1568983997-20004-3-git-send-email-cchiluve@codeaurora.org> (raw)
In-Reply-To: <1568983997-20004-1-git-send-email-cchiluve@codeaurora.org>
From: Chandana Kishori Chiluveru <cchiluve@codeaurora.org>
Add interconnect support in dwc3-qcom driver to vote for bus
bandwidth.
This requires for two different paths - from USB master to
DDR slave. The other is from APPS master to USB slave.
Signed-off-by: Chandana Kishori Chiluveru <cchiluve@codeaurora.org>
---
drivers/usb/dwc3/dwc3-qcom.c | 145 ++++++++++++++++++++++++++++++++++++++++++-
1 file changed, 143 insertions(+), 2 deletions(-)
diff --git a/drivers/usb/dwc3/dwc3-qcom.c b/drivers/usb/dwc3/dwc3-qcom.c
index 184df4d..3a540f7 100644
--- a/drivers/usb/dwc3/dwc3-qcom.c
+++ b/drivers/usb/dwc3/dwc3-qcom.c
@@ -12,6 +12,7 @@
#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/extcon.h>
+#include <linux/interconnect.h>
#include <linux/of_platform.h>
#include <linux/platform_device.h>
#include <linux/phy/phy.h>
@@ -59,8 +60,13 @@ struct dwc3_qcom {
enum usb_dr_mode mode;
bool is_suspended;
bool pm_suspended;
+ struct icc_path *usb_ddr_icc_path;
+ struct icc_path *apps_usb_icc_path;
};
+static int dwc3_qcom_interconnect_enable(struct dwc3_qcom *qcom);
+static int dwc3_qcom_interconnect_disable(struct dwc3_qcom *qcom);
+
static inline void dwc3_qcom_setbits(void __iomem *base, u32 offset, u32 val)
{
u32 reg;
@@ -222,7 +228,7 @@ static void dwc3_qcom_enable_interrupts(struct dwc3_qcom *qcom)
static int dwc3_qcom_suspend(struct dwc3_qcom *qcom)
{
u32 val;
- int i;
+ int i, ret;
if (qcom->is_suspended)
return 0;
@@ -234,6 +240,10 @@ static int dwc3_qcom_suspend(struct dwc3_qcom *qcom)
for (i = qcom->num_clocks - 1; i >= 0; i--)
clk_disable_unprepare(qcom->clks[i]);
+ ret = dwc3_qcom_interconnect_disable(qcom);
+ if (ret)
+ dev_warn(qcom->dev, "failed to disable interconnect %d\n", ret);
+
qcom->is_suspended = true;
dwc3_qcom_enable_interrupts(qcom);
@@ -259,6 +269,10 @@ static int dwc3_qcom_resume(struct dwc3_qcom *qcom)
}
}
+ ret = dwc3_qcom_interconnect_enable(qcom);
+ if (ret)
+ dev_warn(qcom->dev, "failed to enable interconnect %d\n", ret);
+
/* Clear existing events from PHY related to L2 in/out */
dwc3_qcom_setbits(qcom->qscratch_base, PWR_EVNT_IRQ_STAT_REG,
PWR_EVNT_LPM_IN_L2_MASK | PWR_EVNT_LPM_OUT_L2_MASK);
@@ -268,6 +282,124 @@ static int dwc3_qcom_resume(struct dwc3_qcom *qcom)
return 0;
}
+/* Interconnect path bandwidths in MBps */
+#define USB_MEMORY_AVG_HS_BW MBps_to_icc(240)
+#define USB_MEMORY_PEAK_HS_BW MBps_to_icc(700)
+#define USB_MEMORY_AVG_SS_BW MBps_to_icc(1000)
+#define USB_MEMORY_PEAK_SS_BW MBps_to_icc(2500)
+#define APPS_USB_AVG_BW 0
+#define APPS_USB_PEAK_BW MBps_to_icc(40)
+
+/**
+ * dwc3_qcom_interconnect_init() - Initialize the interconnect
+ * @qcom: Pointer to the concerned usb core.
+ *
+ */
+static int dwc3_qcom_interconnect_init(struct dwc3_qcom *qcom)
+{
+ struct device *dev = qcom->dev;
+ struct dwc3 *dwc;
+ int ret;
+
+ if (!device_is_bound(&qcom->dwc3->dev)) {
+ dev_err(qcom->dev, "device is not bound\n");
+ return -EPROBE_DEFER;
+ }
+
+ qcom->usb_ddr_icc_path = of_icc_get(dev, "usb-ddr");
+ if (IS_ERR(qcom->usb_ddr_icc_path)) {
+ dev_err(dev, "Error: (%ld) failed getting usb-ddr path\n",
+ PTR_ERR(qcom->usb_ddr_icc_path));
+ return PTR_ERR(qcom->usb_ddr_icc_path);
+ }
+
+ qcom->apps_usb_icc_path = of_icc_get(dev, "apps-usb");
+ if (IS_ERR(qcom->apps_usb_icc_path)) {
+ dev_err(dev, "Error: (%ld) failed getting apps-usb path\n",
+ PTR_ERR(qcom->apps_usb_icc_path));
+ return PTR_ERR(qcom->apps_usb_icc_path);
+ }
+
+ ret = dwc3_qcom_interconnect_enable(qcom);
+ if (ret) {
+ dev_err(dev, "failed to enable interconnect: %d\n", ret);
+ return ret;
+ }
+
+ return 0;
+}
+
+/**
+ * dwc3_qcom_interconnect_exit() - Release interconnect path handles
+ * @qcom: Pointer to the concerned usb core.
+ *
+ * This function is used to release interconnect path handle.
+ */
+static void dwc3_qcom_interconnect_exit(struct dwc3_qcom *qcom)
+{
+ icc_put(qcom->usb_ddr_icc_path);
+ icc_put(qcom->apps_usb_icc_path);
+}
+
+/* Currently we only use bandwidth level, so just "enable" interconnects */
+static int dwc3_qcom_interconnect_enable(struct dwc3_qcom *qcom)
+{
+ struct dwc3 *dwc = platform_get_drvdata(qcom->dwc3);
+ int ret;
+
+ if (dwc->maximum_speed == USB_SPEED_SUPER) {
+ ret = icc_set_bw(qcom->usb_ddr_icc_path,
+ USB_MEMORY_AVG_SS_BW, USB_MEMORY_PEAK_SS_BW);
+ if (ret)
+ return ret;
+ } else {
+ ret = icc_set_bw(qcom->usb_ddr_icc_path,
+ USB_MEMORY_AVG_HS_BW, USB_MEMORY_PEAK_HS_BW);
+ if (ret)
+ return ret;
+ }
+
+ ret = icc_set_bw(qcom->apps_usb_icc_path,
+ APPS_USB_AVG_BW, APPS_USB_PEAK_BW);
+ if (ret)
+ goto err_disable_mem_path;
+
+ return 0;
+
+err_disable_mem_path:
+ icc_set_bw(qcom->usb_ddr_icc_path, 0, 0);
+
+ return ret;
+}
+
+/* To disable an interconnect, we just set its bandwidth to 0 */
+static int dwc3_qcom_interconnect_disable(struct dwc3_qcom *qcom)
+{
+ struct dwc3 *dwc = platform_get_drvdata(qcom->dwc3);
+ int ret;
+
+ ret = icc_set_bw(qcom->usb_ddr_icc_path, 0, 0);
+ if (ret)
+ return ret;
+
+ ret = icc_set_bw(qcom->apps_usb_icc_path, 0, 0);
+ if (ret)
+ goto err_reenable_memory_path;
+
+ return 0;
+
+ /* Re-enable things in the event of an error */
+err_reenable_memory_path:
+ if (dwc->maximum_speed == USB_SPEED_SUPER)
+ icc_set_bw(qcom->usb_ddr_icc_path,
+ USB_MEMORY_AVG_SS_BW, USB_MEMORY_PEAK_SS_BW);
+ else
+ icc_set_bw(qcom->usb_ddr_icc_path,
+ USB_MEMORY_AVG_HS_BW, USB_MEMORY_PEAK_HS_BW);
+
+ return ret;
+}
+
static irqreturn_t qcom_dwc3_resume_irq(int irq, void *data)
{
struct dwc3_qcom *qcom = data;
@@ -494,6 +626,12 @@ static int dwc3_qcom_probe(struct platform_device *pdev)
goto depopulate;
}
+ ret = dwc3_qcom_interconnect_init(qcom);
+ if (ret) {
+ dev_err(dev, "failed to init interconnect: %d\n", ret);
+ goto depopulate;
+ }
+
qcom->mode = usb_get_dr_mode(&qcom->dwc3->dev);
/* enable vbus override for device mode */
@@ -503,7 +641,7 @@ static int dwc3_qcom_probe(struct platform_device *pdev)
/* register extcon to override sw_vbus on Vbus change later */
ret = dwc3_qcom_register_extcon(qcom);
if (ret)
- goto depopulate;
+ goto interconnect_exit;
device_init_wakeup(&pdev->dev, 1);
qcom->is_suspended = false;
@@ -513,6 +651,8 @@ static int dwc3_qcom_probe(struct platform_device *pdev)
return 0;
+interconnect_exit:
+ dwc3_qcom_interconnect_exit(qcom);
depopulate:
of_platform_depopulate(&pdev->dev);
clk_disable:
@@ -540,6 +680,7 @@ static int dwc3_qcom_remove(struct platform_device *pdev)
}
qcom->num_clocks = 0;
+ dwc3_qcom_interconnect_exit(qcom);
reset_control_assert(qcom->resets);
pm_runtime_allow(dev);
--
Qualcomm India Private Limited, on behalf of Qualcomm Innovation Center, Inc.,
is a member of Code Aurora Forum, a Linux Foundation Collaborative Project.
next prev parent reply other threads:[~2019-09-20 12:53 UTC|newest]
Thread overview: 7+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-09-20 12:53 [PATCH V4 0/3] ADD interconnect support for Qualcomm DWC3 driver cchiluve
2019-09-20 12:53 ` [PATCH V4 1/3] dt-bindings: Introduce interconnect properties " cchiluve
2020-01-31 17:13 ` Matthias Kaehlcke
2019-09-20 12:53 ` cchiluve [this message]
2020-01-31 17:53 ` [PATCH V4 2/3] usb: dwc3: qcom: Add interconnect support in dwc3 driver Matthias Kaehlcke
2019-09-20 12:53 ` [PATCH V4 3/3] arm64: dts: sdm845: Add interconnect properties for USB cchiluve
2020-02-03 23:52 ` Matthias Kaehlcke
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=1568983997-20004-3-git-send-email-cchiluve@codeaurora.org \
--to=cchiluve@codeaurora.org \
--cc=agross@kernel.org \
--cc=balbi@kernel.org \
--cc=david.brown@linaro.org \
--cc=linux-usb@vger.kernel.org \
/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).