diff options
Diffstat (limited to 'target/linux/ipq806x/patches-4.4/006-mfd-qcom_rpm-Handle-message-RAM-clock.patch')
| -rw-r--r-- | target/linux/ipq806x/patches-4.4/006-mfd-qcom_rpm-Handle-message-RAM-clock.patch | 94 |
1 files changed, 94 insertions, 0 deletions
diff --git a/target/linux/ipq806x/patches-4.4/006-mfd-qcom_rpm-Handle-message-RAM-clock.patch b/target/linux/ipq806x/patches-4.4/006-mfd-qcom_rpm-Handle-message-RAM-clock.patch new file mode 100644 index 0000000000..01168bbb12 --- /dev/null +++ b/target/linux/ipq806x/patches-4.4/006-mfd-qcom_rpm-Handle-message-RAM-clock.patch @@ -0,0 +1,94 @@ +From 3526403353c2a1b94c3181f900582626d23c339b Mon Sep 17 00:00:00 2001 +From: Linus Walleij <linus.walleij@linaro.org> +Date: Thu, 18 Aug 2016 20:40:45 +0200 +Subject: mfd: qcom_rpm: Handle message RAM clock +MIME-Version: 1.0 +Content-Type: text/plain; charset=UTF-8 +Content-Transfer-Encoding: 8bit + +The MSM8660, APQ8060, IPQ806x and MSM8960 have a GCC clock +to the message RAM used by the RPM. This needs to be enabled +for messages to pass through. This is a crude solution that +simply prepare/enable at probe() and disable/unprepare +at remove(). More elaborate PM is probably possible to +add later. + +The construction uses IS_ERR() to gracefully handle the +platforms that do not provide a message RAM clock. It will +bail out of probe only if the clock is hitting a probe +deferral situation. + +Of course this requires the proper device tree set-up: + +rpm: rpm@104000 { + compatible = "qcom,rpm-msm8660"; + clocks = <&gcc RPM_MSG_RAM_H_CLK>; + clock-names = "ram"; + ... +}; + +I have provided this in the MSM8660 device tree, and will +provide patches for the other targets. + +Cc: Björn Andersson <bjorn.andersson@linaro.org> +Signed-off-by: Linus Walleij <linus.walleij@linaro.org> +Signed-off-by: Lee Jones <lee.jones@linaro.org> +--- + drivers/mfd/qcom_rpm.c | 20 ++++++++++++++++++++ + 1 file changed, 20 insertions(+) + +diff --git a/drivers/mfd/qcom_rpm.c b/drivers/mfd/qcom_rpm.c +index d330071..52fafea 100644 +--- a/drivers/mfd/qcom_rpm.c ++++ b/drivers/mfd/qcom_rpm.c +@@ -21,6 +21,7 @@ + #include <linux/mfd/qcom_rpm.h> + #include <linux/mfd/syscon.h> + #include <linux/regmap.h> ++#include <linux/clk.h> + + #include <dt-bindings/mfd/qcom-rpm.h> + +@@ -48,6 +49,7 @@ struct qcom_rpm { + struct regmap *ipc_regmap; + unsigned ipc_offset; + unsigned ipc_bit; ++ struct clk *ramclk; + + struct completion ack; + struct mutex lock; +@@ -552,6 +554,20 @@ static int qcom_rpm_probe(struct platform_device *pdev) + mutex_init(&rpm->lock); + init_completion(&rpm->ack); + ++ /* Enable message RAM clock */ ++ rpm->ramclk = devm_clk_get(&pdev->dev, "ram"); ++ if (IS_ERR(rpm->ramclk)) { ++ ret = PTR_ERR(rpm->ramclk); ++ if (ret == -EPROBE_DEFER) ++ return ret; ++ /* ++ * Fall through in all other cases, as the clock is ++ * optional. (Does not exist on all platforms.) ++ */ ++ rpm->ramclk = NULL; ++ } ++ clk_prepare_enable(rpm->ramclk); /* Accepts NULL */ ++ + irq_ack = platform_get_irq_byname(pdev, "ack"); + if (irq_ack < 0) { + dev_err(&pdev->dev, "required ack interrupt missing\n"); +@@ -672,7 +688,11 @@ static int qcom_rpm_probe(struct platform_device *pdev) + + static int qcom_rpm_remove(struct platform_device *pdev) + { ++ struct qcom_rpm *rpm = dev_get_drvdata(&pdev->dev); ++ + of_platform_depopulate(&pdev->dev); ++ clk_disable_unprepare(rpm->ramclk); ++ + return 0; + } + +-- +cgit v0.12 |