linux-kernel - Re: [PATCH v1 3/4] serial: qcom-geni: Enable PM runtime for serial driver

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Message-ID: <8a51bb87-ce81-4adc-92b3-9a077f124ff8@oss.qualcomm.com>
Date: Wed, 31 Dec 2025 07:51:18 +0200
From: Dmitry Baryshkov <dmitry.baryshkov@....qualcomm.com>
To: Praveen Talari <praveen.talari@....qualcomm.com>
Cc: Bjorn Andersson <andersson@...nel.org>,
        Konrad Dybcio <konradybcio@...nel.org>, Rob Herring <robh@...nel.org>,
        Krzysztof Kozlowski <krzk+dt@...nel.org>,
        Conor Dooley
 <conor+dt@...nel.org>,
        Linus Walleij <linus.walleij@...aro.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Jiri Slaby <jirislaby@...nel.org>, Dmitry Baryshkov <lumag@...nel.org>,
        linux-arm-msm@...r.kernel.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-gpio@...r.kernel.org,
        linux-serial@...r.kernel.org, alexey.klimov@...aro.org,
        krzk@...nel.org, bryan.odonoghue@...aro.org,
        jorge.ramirez@....qualcomm.com,
        Konrad Dybcio <konrad.dybcio@....qualcomm.com>, psodagud@...cinc.com,
        djaggi@...cinc.com, quic_msavaliy@...cinc.com,
        quic_vtanuku@...cinc.com, quic_arandive@...cinc.com,
        quic_shazhuss@...cinc.com, quic_cchiluve@...cinc.com
Subject: Re: [PATCH v1 3/4] serial: qcom-geni: Enable PM runtime for serial
 driver

On 31/12/2025 07:49, Praveen Talari wrote:
> Hi Dmitry,
> 
> On 12/31/2025 8:30 AM, Dmitry Baryshkov wrote:
>> On 31/12/2025 05:00, Praveen Talari wrote:
>>> Hi Dmitry,
>>>
>>> On 12/30/2025 11:53 PM, Dmitry Baryshkov wrote:
>>>> On Mon, Nov 10, 2025 at 03:40:42PM +0530, Praveen Talari wrote:
>>>>> The GENI serial driver currently handles power resource management
>>>>> through calls to the statically defined geni_serial_resources_on() and
>>>>> geni_serial_resources_off() functions. This approach reduces 
>>>>> modularity
>>>>> and limits support for platforms with diverse power management
>>>>> mechanisms, including resource managed by firmware.
>>>>>
>>>>> Improve modularity and enable better integration with platform- 
>>>>> specific
>>>>> power management, introduce support for runtime PM. Use
>>>>> pm_runtime_resume_and_get() and pm_runtime_put_sync() within the
>>>>> qcom_geni_serial_pm() callback to control resource power state
>>>>> transitions based on UART power state changes.
>>>>>
>>>>> Signed-off-by: Praveen Talari <praveen.talari@....qualcomm.com>
>>>>> ---
>>>>>   drivers/tty/serial/qcom_geni_serial.c | 24 ++++++++++++++++++++++--
>>>>>   1 file changed, 22 insertions(+), 2 deletions(-)
>>>>>
>>>>
>>>> This breaks BT support on the Qualcomm RB2 platform. With this patch
>>>> applied, I'm getting the following:
>>>>
>>>> root@...m-armv8a:~# dmesg | grep tty\\\|hci0
>>>> [    0.000000] Kernel command line:  ignore_loglevel 
>>>> console=ttyMSM0,115200n8 earlycon root=PARTLABEL=rootfs rootwait 
>>>> systemd.mask=pd-mapper.service -- 
>>>> androidboot.bootdevice=4744000.sdhci androidboot.serialno=2b89b520 
>>>> androidboot.baseband=apq 
>>>> msm_drm.dsi_display0=qcom,mdss_dsi_ext_bridge_1080p:
>>>> [    4.074354] 4a8c000.serial: ttyHS1 at MMIO 0x4a8c000 (irq = 140, 
>>>> base_baud = 0) is a MSM
>>>> [    4.099410] serial serial0: tty port ttyHS1 registered
>>>> [    4.131200] Bluetooth: hci0: setting up wcn399x
>>>> [    4.149847] 4a90000.serial: ttyMSM0 at MMIO 0x4a90000 (irq = 142, 
>>>> base_baud = 0) is a MSM
>>>> [    4.229099] printk: legacy console [ttyMSM0] enabled
>>>> [    6.499519] Bluetooth: hci0: command 0xfc00 tx timeout
>>>> [    6.514347] Bluetooth: hci0: Reading QCA version information 
>>>> failed (-110)
>>>> [    6.559933] Bluetooth: hci0: Retry BT power ON:0
>>>> [    8.016330] systemd[1]: Created slice Slice /system/getty.
>>>> [    8.066194] systemd[1]: Created slice Slice /system/serial-getty.
>>>> [    8.148389] systemd[1]: Expecting device /dev/ttyMSM0...
>>>> [    8.956804] Bluetooth: hci0: command 0xfc00 tx timeout
>>>> [    8.962447] Bluetooth: hci0: Reading QCA version information 
>>>> failed (-110)
>>>> [    8.976917] Bluetooth: hci0: Retry BT power ON:1
>>>> [   11.296715] Bluetooth: hci0: command 0xfc00 tx timeout
>>>> [   11.302340] Bluetooth: hci0: Reading QCA version information 
>>>> failed (-110)
>>>> [   11.309534] Bluetooth: hci0: Retry BT power ON:2
>>>> [   13.660078] Bluetooth: hci0: command 0xfc00 tx timeout
>>>> [   13.665814] Bluetooth: hci0: Reading QCA version information 
>>>> failed (-110)
>>>
>>> Sure, will check and update.
>>>
>>> If possible, can you share what is DT filename for RB2.
>>
>> qrb4210-rb2.dts
> 
> Can you please try below change on target since i didn't get target yet?

Yes, I have this patch too. It didn't help.

> 
> diff --git a/arch/arm64/boot/dts/qcom/qrb4210-rb2.dts b/arch/arm64/boot/ 
> dts/qcom/qrb4210-rb2.dts
> index 0cd36c54632f..5f8613150bdd 100644
> --- a/arch/arm64/boot/dts/qcom/qrb4210-rb2.dts
> +++ b/arch/arm64/boot/dts/qcom/qrb4210-rb2.dts
> @@ -694,7 +694,7 @@ sdc2_card_det_n: sd-card-det-n-state {
> 
>   &uart3 {
>          interrupts-extended = <&intc GIC_SPI 330 IRQ_TYPE_LEVEL_HIGH>,
> -                             <&tlmm 11 IRQ_TYPE_LEVEL_HIGH>;
> +                             <&tlmm 11 IRQ_TYPE_EDGE_FALLING>;
>          pinctrl-0 = <&uart3_default>;
>          pinctrl-1 = <&uart3_sleep>;
>          pinctrl-names = "default", "sleep";
> 
> Thanks,
> Praveen Talari
> 
>>
>>>
>>> Earlier I had validated on RB1 and Kodiak.
>>>
>>> Thanks,
>>> Praveen
>>>
>>>>
>>>> After reverting the next and this patches, BT is back to normal:
>>>>
>>>> [    4.067201] 4a8c000.serial: ttyHS1 at MMIO 0x4a8c000 (irq = 140, 
>>>> base_baud = 0) is a MSM
>>>> [    4.082426] serial serial0: tty port ttyHS1 registered
>>>> [    4.106122] 4a90000.serial: ttyMSM0 at MMIO 0x4a90000 (irq = 142, 
>>>> base_baud = 0) is a MSM
>>>> [    4.108647] Bluetooth: hci0: setting up wcn399x
>>>> [    4.125371] printk: legacy console [ttyMSM0] enabled
>>>> [    4.445205] Bluetooth: hci0: QCA Product ID   :0x0000000a
>>>> [    4.450927] Bluetooth: hci0: QCA SOC Version  :0x40020150
>>>> [    4.456470] Bluetooth: hci0: QCA ROM Version  :0x00000201
>>>> [    4.462006] Bluetooth: hci0: QCA Patch Version:0x00000001
>>>> [    4.509408] Bluetooth: hci0: QCA controller version 0x01500201
>>>> [    4.515656] Bluetooth: hci0: QCA Downloading qca/apbtfw11.tlv
>>>> [    5.488739] Bluetooth: hci0: QCA Downloading qca/apnv11.bin
>>>> [    5.671740] Bluetooth: hci0: QCA setup on UART is completed
>>>> [    7.993368] systemd[1]: Created slice Slice /system/getty.
>>>> [    8.045612] systemd[1]: Created slice Slice /system/serial-getty.
>>>> [    8.125418] systemd[1]: Expecting device /dev/ttyMSM0...
>>>>
>>>>
>>
>>
> 


-- 
With best wishes
Dmitry