linux-kernel - Re: [PATCH] bus: mhi: pci_generic: Apply no-op for wake using inband wake support flag

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Date:   Fri, 18 Jun 2021 10:06:28 -0700
From:   Bhaumik Bhatt <bbhatt@...eaurora.org>
To:     Manivannan Sadhasivam <manivannan.sadhasivam@...aro.org>
Cc:     linux-arm-msm@...r.kernel.org, hemantk@...eaurora.org,
        jhugo@...eaurora.org, linux-kernel@...r.kernel.org,
        carl.yin@...ctel.com, naveen.kumar@...ctel.com,
        loic.poulain@...aro.org
Subject: Re: [PATCH] bus: mhi: pci_generic: Apply no-op for wake using inband
 wake support flag

Hi Mani,
On 2021-06-17 11:52 PM, Manivannan Sadhasivam wrote:
> On Thu, Jun 17, 2021 at 11:23:53AM -0700, Bhaumik Bhatt wrote:
>> Devices such as SDX24 do not have the provision for inband wake
>> doorbell in the form of channel 127. Newer devices such as SDX55
>> or SDX65 have it by default. Ensure the functionality is used
>> based on this such that device wake stays held when a client
>> driver uses mhi_device_get() API or the equivalent debugfs entry.
>> 
>> Fixes: e3e5e6508fc1 ("bus: mhi: pci_generic: No-Op for device_wake 
>> operations")
>> Signed-off-by: Bhaumik Bhatt <bbhatt@...eaurora.org>
>> ---
>>  drivers/bus/mhi/pci_generic.c | 26 ++++++++++++++++++--------
>>  1 file changed, 18 insertions(+), 8 deletions(-)
>> 
>> diff --git a/drivers/bus/mhi/pci_generic.c 
>> b/drivers/bus/mhi/pci_generic.c
>> index d84b743..31360a2 100644
>> --- a/drivers/bus/mhi/pci_generic.c
>> +++ b/drivers/bus/mhi/pci_generic.c
>> @@ -32,6 +32,7 @@
>>   * @edl: emergency download mode firmware path (if any)
>>   * @bar_num: PCI base address register to use for MHI MMIO register 
>> space
>>   * @dma_data_width: DMA transfer word size (32 or 64 bits)
>> + * @no_inband_wake: Devices without inband wake support (such as 
>> sdx24)
> 
> I'd rather like this field to be "inband_wake" and set to false/true
> based on the capability of the devices. Rest looks good.
> 
> Thanks,
> Mani
> 
I should have known this was coming :)

Can I use sideband_wake instead of no_inband_wake and leave the booleans 
as is?
By default, inband_wake will have to be true for any and all devices 
moving
forward.

Please let me know your preference.
>>   */
>>  struct mhi_pci_dev_info {
>>  	const struct mhi_controller_config *config;
>> @@ -40,6 +41,7 @@ struct mhi_pci_dev_info {
>>  	const char *edl;
>>  	unsigned int bar_num;
>>  	unsigned int dma_data_width;
>> +	bool no_inband_wake;
>>  };
>> 
>>  #define MHI_CHANNEL_CONFIG_UL(ch_num, ch_name, el_count, ev_ring) \
>> @@ -242,7 +244,8 @@ static const struct mhi_pci_dev_info 
>> mhi_qcom_sdx65_info = {
>>  	.edl = "qcom/sdx65m/edl.mbn",
>>  	.config = &modem_qcom_v1_mhiv_config,
>>  	.bar_num = MHI_PCI_DEFAULT_BAR_NUM,
>> -	.dma_data_width = 32
>> +	.dma_data_width = 32,
>> +	.no_inband_wake = false
>>  };
>> 
>>  static const struct mhi_pci_dev_info mhi_qcom_sdx55_info = {
>> @@ -251,7 +254,8 @@ static const struct mhi_pci_dev_info 
>> mhi_qcom_sdx55_info = {
>>  	.edl = "qcom/sdx55m/edl.mbn",
>>  	.config = &modem_qcom_v1_mhiv_config,
>>  	.bar_num = MHI_PCI_DEFAULT_BAR_NUM,
>> -	.dma_data_width = 32
>> +	.dma_data_width = 32,
>> +	.no_inband_wake = false
>>  };
>> 
>>  static const struct mhi_pci_dev_info mhi_qcom_sdx24_info = {
>> @@ -259,7 +263,8 @@ static const struct mhi_pci_dev_info 
>> mhi_qcom_sdx24_info = {
>>  	.edl = "qcom/prog_firehose_sdx24.mbn",
>>  	.config = &modem_qcom_v1_mhiv_config,
>>  	.bar_num = MHI_PCI_DEFAULT_BAR_NUM,
>> -	.dma_data_width = 32
>> +	.dma_data_width = 32,
>> +	.no_inband_wake = true
>>  };
>> 
>>  static const struct mhi_channel_config mhi_quectel_em1xx_channels[] = 
>> {
>> @@ -301,7 +306,8 @@ static const struct mhi_pci_dev_info 
>> mhi_quectel_em1xx_info = {
>>  	.edl = "qcom/prog_firehose_sdx24.mbn",
>>  	.config = &modem_quectel_em1xx_config,
>>  	.bar_num = MHI_PCI_DEFAULT_BAR_NUM,
>> -	.dma_data_width = 32
>> +	.dma_data_width = 32,
>> +	.no_inband_wake = true
>>  };
>> 
>>  static const struct mhi_channel_config mhi_foxconn_sdx55_channels[] = 
>> {
>> @@ -339,7 +345,8 @@ static const struct mhi_pci_dev_info 
>> mhi_foxconn_sdx55_info = {
>>  	.edl = "qcom/sdx55m/edl.mbn",
>>  	.config = &modem_foxconn_sdx55_config,
>>  	.bar_num = MHI_PCI_DEFAULT_BAR_NUM,
>> -	.dma_data_width = 32
>> +	.dma_data_width = 32,
>> +	.no_inband_wake = false
>>  };
>> 
>>  static const struct pci_device_id mhi_pci_id_table[] = {
>> @@ -640,9 +647,12 @@ static int mhi_pci_probe(struct pci_dev *pdev, 
>> const struct pci_device_id *id)
>>  	mhi_cntrl->status_cb = mhi_pci_status_cb;
>>  	mhi_cntrl->runtime_get = mhi_pci_runtime_get;
>>  	mhi_cntrl->runtime_put = mhi_pci_runtime_put;
>> -	mhi_cntrl->wake_get = mhi_pci_wake_get_nop;
>> -	mhi_cntrl->wake_put = mhi_pci_wake_put_nop;
>> -	mhi_cntrl->wake_toggle = mhi_pci_wake_toggle_nop;
>> +
>> +	if (info->no_inband_wake) {
>> +		mhi_cntrl->wake_get = mhi_pci_wake_get_nop;
>> +		mhi_cntrl->wake_put = mhi_pci_wake_put_nop;
>> +		mhi_cntrl->wake_toggle = mhi_pci_wake_toggle_nop;
>> +	}
>> 
>>  	err = mhi_pci_claim(mhi_cntrl, info->bar_num, 
>> DMA_BIT_MASK(info->dma_data_width));
>>  	if (err)
>> --
>> The Qualcomm Innovation Center, Inc. is a member of the Code Aurora 
>> Forum,
>> a Linux Foundation Collaborative Project
>> 

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