Hi,
On Wed, Mar 29, 2023 at 1:18 PM Mario Limonciello
<[email protected]> wrote:
>
> When the BIOS has been configured for Fast Boot, systems with mt7921e
> have non-functional wifi. Turning on Fast boot caused both bus master
> enable and memory space enable bits in PCI_COMMAND not to get configured.
>
> The mt7921 driver already sets bus master enable, but explicitly check
> and set memory access enable as well to fix this problem.
>
> Tested-by: Anson Tsao <[email protected]>
> Signed-off-by: Mario Limonciello <[email protected]>
> ---
> Original patch was submitted ~3 weeks ago with no comments.
> Link: https://lore.kernel.org/all/[email protected]/
> ---
> drivers/net/wireless/mediatek/mt76/mt7921/pci.c | 6 ++++++
> 1 file changed, 6 insertions(+)
>
> diff --git a/drivers/net/wireless/mediatek/mt76/mt7921/pci.c b/drivers/net/wireless/mediatek/mt76/mt7921/pci.c
> index cb72ded37256..aa1a427b16c2 100644
> --- a/drivers/net/wireless/mediatek/mt76/mt7921/pci.c
> +++ b/drivers/net/wireless/mediatek/mt76/mt7921/pci.c
> @@ -263,6 +263,7 @@ static int mt7921_pci_probe(struct pci_dev *pdev,
> struct mt76_dev *mdev;
> u8 features;
> int ret;
> + u16 cmd;
>
> ret = pcim_enable_device(pdev);
> if (ret)
> @@ -272,6 +273,11 @@ static int mt7921_pci_probe(struct pci_dev *pdev,
> if (ret)
> return ret;
>
> + pci_read_config_word(pdev, PCI_COMMAND, &cmd);
> + if (!(cmd & PCI_COMMAND_MEMORY)) {
> + cmd |= PCI_COMMAND_MEMORY;
> + pci_write_config_word(pdev, PCI_COMMAND, cmd);
> + }
If PCI_COMMAND_MEMORY is required in any circumstance, then we don't
need to add a conditional check and OR it with PCI_COMMAND_MEMORY.
Also, I will try the patch on another Intel machine to see if it worked.
Sean
> pci_set_master(pdev);
>
> ret = pci_alloc_irq_vectors(pdev, 1, 1, PCI_IRQ_ALL_TYPES);
> --
> 2.34.1
>
On 3/29/2023 18:24, Sean Wang wrote:
> Hi,
>
> On Wed, Mar 29, 2023 at 1:18 PM Mario Limonciello
> <[email protected]> wrote:
>>
>> When the BIOS has been configured for Fast Boot, systems with mt7921e
>> have non-functional wifi. Turning on Fast boot caused both bus master
>> enable and memory space enable bits in PCI_COMMAND not to get configured.
>>
>> The mt7921 driver already sets bus master enable, but explicitly check
>> and set memory access enable as well to fix this problem.
>>
>> Tested-by: Anson Tsao <[email protected]>
>> Signed-off-by: Mario Limonciello <[email protected]>
>> ---
>> Original patch was submitted ~3 weeks ago with no comments.
>> Link: https://lore.kernel.org/all/[email protected]/
>> ---
>> drivers/net/wireless/mediatek/mt76/mt7921/pci.c | 6 ++++++
>> 1 file changed, 6 insertions(+)
>>
>> diff --git a/drivers/net/wireless/mediatek/mt76/mt7921/pci.c b/drivers/net/wireless/mediatek/mt76/mt7921/pci.c
>> index cb72ded37256..aa1a427b16c2 100644
>> --- a/drivers/net/wireless/mediatek/mt76/mt7921/pci.c
>> +++ b/drivers/net/wireless/mediatek/mt76/mt7921/pci.c
>> @@ -263,6 +263,7 @@ static int mt7921_pci_probe(struct pci_dev *pdev,
>> struct mt76_dev *mdev;
>> u8 features;
>> int ret;
>> + u16 cmd;
>>
>> ret = pcim_enable_device(pdev);
>> if (ret)
>> @@ -272,6 +273,11 @@ static int mt7921_pci_probe(struct pci_dev *pdev,
>> if (ret)
>> return ret;
>>
>> + pci_read_config_word(pdev, PCI_COMMAND, &cmd);
>> + if (!(cmd & PCI_COMMAND_MEMORY)) {
>> + cmd |= PCI_COMMAND_MEMORY;
>> + pci_write_config_word(pdev, PCI_COMMAND, cmd);
>> + }
>
> If PCI_COMMAND_MEMORY is required in any circumstance, then we don't
> need to add a conditional check and OR it with PCI_COMMAND_MEMORY.
Generally it seemed advantageous to avoid an extra PCI write if it's not
needed. For example that's how bus mastering works too (see
__pci_set_master).
> Also, I will try the patch on another Intel machine to see if it worked.
Thanks.
>
> Sean
>
>> pci_set_master(pdev);
>>
>> ret = pci_alloc_irq_vectors(pdev, 1, 1, PCI_IRQ_ALL_TYPES);
>> --
>> 2.34.1
>>
[Public]
> On 3/29/2023 18:24, Sean Wang wrote:
> > Hi,
> >
> > On Wed, Mar 29, 2023 at 1:18 PM Mario Limonciello
> > <[email protected]> wrote:
> >>
> >> When the BIOS has been configured for Fast Boot, systems with mt7921e
> >> have non-functional wifi. Turning on Fast boot caused both bus master
> >> enable and memory space enable bits in PCI_COMMAND not to get
> configured.
> >>
> >> The mt7921 driver already sets bus master enable, but explicitly check
> >> and set memory access enable as well to fix this problem.
> >>
> >> Tested-by: Anson Tsao <[email protected]>
> >> Signed-off-by: Mario Limonciello <[email protected]>
> >> ---
> >> Original patch was submitted ~3 weeks ago with no comments.
> >> Link: https://lore.kernel.org/all/20230310170002.200-1-
> [email protected]/
> >> ---
> >> drivers/net/wireless/mediatek/mt76/mt7921/pci.c | 6 ++++++
> >> 1 file changed, 6 insertions(+)
> >>
> >> diff --git a/drivers/net/wireless/mediatek/mt76/mt7921/pci.c
> b/drivers/net/wireless/mediatek/mt76/mt7921/pci.c
> >> index cb72ded37256..aa1a427b16c2 100644
> >> --- a/drivers/net/wireless/mediatek/mt76/mt7921/pci.c
> >> +++ b/drivers/net/wireless/mediatek/mt76/mt7921/pci.c
> >> @@ -263,6 +263,7 @@ static int mt7921_pci_probe(struct pci_dev *pdev,
> >> struct mt76_dev *mdev;
> >> u8 features;
> >> int ret;
> >> + u16 cmd;
> >>
> >> ret = pcim_enable_device(pdev);
> >> if (ret)
> >> @@ -272,6 +273,11 @@ static int mt7921_pci_probe(struct pci_dev
> *pdev,
> >> if (ret)
> >> return ret;
> >>
> >> + pci_read_config_word(pdev, PCI_COMMAND, &cmd);
> >> + if (!(cmd & PCI_COMMAND_MEMORY)) {
> >> + cmd |= PCI_COMMAND_MEMORY;
> >> + pci_write_config_word(pdev, PCI_COMMAND, cmd);
> >> + }
> >
> > If PCI_COMMAND_MEMORY is required in any circumstance, then we
> don't
> > need to add a conditional check and OR it with PCI_COMMAND_MEMORY.
>
> Generally it seemed advantageous to avoid an extra PCI write if it's not
> needed. For example that's how bus mastering works too (see
> __pci_set_master).
>
>
> > Also, I will try the patch on another Intel machine to see if it worked.
>
> Thanks.
Did you get a chance to try this on an Intel system?
>
> >
> > Sean
> >
> >> pci_set_master(pdev);
> >>
> >> ret = pci_alloc_irq_vectors(pdev, 1, 1, PCI_IRQ_ALL_TYPES);
> >> --
> >> 2.34.1
> >>
On Mon, Apr 3, 2023 at 6:42 AM Limonciello, Mario
<[email protected]> wrote:
>
> [Public]
>
> > On 3/29/2023 18:24, Sean Wang wrote:
> > > Hi,
> > >
> > > On Wed, Mar 29, 2023 at 1:18 PM Mario Limonciello
> > > <[email protected]> wrote:
> > >>
> > >> When the BIOS has been configured for Fast Boot, systems with mt7921e
> > >> have non-functional wifi. Turning on Fast boot caused both bus master
> > >> enable and memory space enable bits in PCI_COMMAND not to get
> > configured.
> > >>
> > >> The mt7921 driver already sets bus master enable, but explicitly check
> > >> and set memory access enable as well to fix this problem.
> > >>
> > >> Tested-by: Anson Tsao <[email protected]>
> > >> Signed-off-by: Mario Limonciello <[email protected]>
> > >> ---
> > >> Original patch was submitted ~3 weeks ago with no comments.
> > >> Link: https://lore.kernel.org/all/20230310170002.200-1-
> > [email protected]/
> > >> ---
> > >> drivers/net/wireless/mediatek/mt76/mt7921/pci.c | 6 ++++++
> > >> 1 file changed, 6 insertions(+)
> > >>
> > >> diff --git a/drivers/net/wireless/mediatek/mt76/mt7921/pci.c
> > b/drivers/net/wireless/mediatek/mt76/mt7921/pci.c
> > >> index cb72ded37256..aa1a427b16c2 100644
> > >> --- a/drivers/net/wireless/mediatek/mt76/mt7921/pci.c
> > >> +++ b/drivers/net/wireless/mediatek/mt76/mt7921/pci.c
> > >> @@ -263,6 +263,7 @@ static int mt7921_pci_probe(struct pci_dev *pdev,
> > >> struct mt76_dev *mdev;
> > >> u8 features;
> > >> int ret;
> > >> + u16 cmd;
> > >>
> > >> ret = pcim_enable_device(pdev);
> > >> if (ret)
> > >> @@ -272,6 +273,11 @@ static int mt7921_pci_probe(struct pci_dev
> > *pdev,
> > >> if (ret)
> > >> return ret;
> > >>
> > >> + pci_read_config_word(pdev, PCI_COMMAND, &cmd);
> > >> + if (!(cmd & PCI_COMMAND_MEMORY)) {
> > >> + cmd |= PCI_COMMAND_MEMORY;
> > >> + pci_write_config_word(pdev, PCI_COMMAND, cmd);
> > >> + }
> > >
> > > If PCI_COMMAND_MEMORY is required in any circumstance, then we
> > don't
> > > need to add a conditional check and OR it with PCI_COMMAND_MEMORY.
> >
> > Generally it seemed advantageous to avoid an extra PCI write if it's not
> > needed. For example that's how bus mastering works too (see
> > __pci_set_master).
> >
> >
> > > Also, I will try the patch on another Intel machine to see if it worked.
> >
> > Thanks.
>
> Did you get a chance to try this on an Intel system?
Hi,
Sorry for the late response. We have tested the related Intel platform
and it worked fine. You can add the tag from me like
Acked-by: Sean Wang <[email protected]>
>
> >
> > >
> > > Sean
> > >
> > >> pci_set_master(pdev);
> > >>
> > >> ret = pci_alloc_irq_vectors(pdev, 1, 1, PCI_IRQ_ALL_TYPES);
> > >> --
> > >> 2.34.1
> > >>