[PATCH] mtd: rawnand: stm32_fmc2: do not support EDO mode

[PATCH] mtd: rawnand: stm32_fmc2: do not support EDO mode

[Christophe Kerello]

FMC2 controller does not support EDO mode (timings mode 4 and 5).

Signed-off-by: Christophe Kerello <christophe.kerello@foss.st.com>
Fixes: 2cd457f328c1 ("mtd: rawnand: stm32_fmc2: add STM32 FMC2 NAND flash controller driver")
---
 drivers/mtd/nand/raw/stm32_fmc2_nand.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/drivers/mtd/nand/raw/stm32_fmc2_nand.c b/drivers/mtd/nand/raw/stm32_fmc2_nand.c
index 5d627048c420..3abb63d00a0b 100644
--- a/drivers/mtd/nand/raw/stm32_fmc2_nand.c
+++ b/drivers/mtd/nand/raw/stm32_fmc2_nand.c
@@ -1531,6 +1531,9 @@ static int stm32_fmc2_nfc_setup_interface(struct nand_chip *chip, int chipnr,
 	if (IS_ERR(sdrt))
 		return PTR_ERR(sdrt);
 
+	if (sdrt->tRC_min < 30000)
+		return -EOPNOTSUPP;
+
 	if (chipnr == NAND_DATA_IFACE_CHECK_ONLY)
 		return 0;
 
-- 
2.25.1

Re: [PATCH] mtd: rawnand: stm32_fmc2: do not support EDO mode

[Miquel Raynal]

Hi Christophe,

christophe.kerello@foss.st.com wrote on Fri, 24 Mar 2023 17:09:18 +0100:

> FMC2 controller does not support EDO mode (timings mode 4 and 5).
> 
> Signed-off-by: Christophe Kerello <christophe.kerello@foss.st.com>
> Fixes: 2cd457f328c1 ("mtd: rawnand: stm32_fmc2: add STM32 FMC2 NAND flash controller driver")
> ---
>  drivers/mtd/nand/raw/stm32_fmc2_nand.c | 3 +++
>  1 file changed, 3 insertions(+)
> 
> diff --git a/drivers/mtd/nand/raw/stm32_fmc2_nand.c b/drivers/mtd/nand/raw/stm32_fmc2_nand.c
> index 5d627048c420..3abb63d00a0b 100644
> --- a/drivers/mtd/nand/raw/stm32_fmc2_nand.c
> +++ b/drivers/mtd/nand/raw/stm32_fmc2_nand.c
> @@ -1531,6 +1531,9 @@ static int stm32_fmc2_nfc_setup_interface(struct nand_chip *chip, int chipnr,
>  	if (IS_ERR(sdrt))
>  		return PTR_ERR(sdrt);
>  
> +	if (sdrt->tRC_min < 30000)

When introducing NV-DDR support we as well added a timings.mode field,
perhaps you could use it?

> +		return -EOPNOTSUPP;
> +
>  	if (chipnr == NAND_DATA_IFACE_CHECK_ONLY)
>  		return 0;
>  


Thanks,
Miquèl

Re: [PATCH] mtd: rawnand: stm32_fmc2: do not support EDO mode

[Christophe Kerello]

Hello Miquel,

On 3/24/23 17:25, Miquel Raynal wrote:
> Hi Christophe,
> 
> christophe.kerello@foss.st.com wrote on Fri, 24 Mar 2023 17:09:18 +0100:
> 
>> FMC2 controller does not support EDO mode (timings mode 4 and 5).
>>
>> Signed-off-by: Christophe Kerello <christophe.kerello@foss.st.com>
>> Fixes: 2cd457f328c1 ("mtd: rawnand: stm32_fmc2: add STM32 FMC2 NAND flash controller driver")
>> ---
>>   drivers/mtd/nand/raw/stm32_fmc2_nand.c | 3 +++
>>   1 file changed, 3 insertions(+)
>>
>> diff --git a/drivers/mtd/nand/raw/stm32_fmc2_nand.c b/drivers/mtd/nand/raw/stm32_fmc2_nand.c
>> index 5d627048c420..3abb63d00a0b 100644
>> --- a/drivers/mtd/nand/raw/stm32_fmc2_nand.c
>> +++ b/drivers/mtd/nand/raw/stm32_fmc2_nand.c
>> @@ -1531,6 +1531,9 @@ static int stm32_fmc2_nfc_setup_interface(struct nand_chip *chip, int chipnr,
>>   	if (IS_ERR(sdrt))
>>   		return PTR_ERR(sdrt);
>>   
>> +	if (sdrt->tRC_min < 30000)
> 
> When introducing NV-DDR support we as well added a timings.mode field,
> perhaps you could use it?

Yes, I can use it. It will be done in V2.

Regards,
Christophe Kerello.

> 
>> +		return -EOPNOTSUPP;
>> +
>>   	if (chipnr == NAND_DATA_IFACE_CHECK_ONLY)
>>   		return 0;
>>   
> 
> 
> Thanks,
> Miquèl

Re: [PATCH] mtd: rawnand: stm32_fmc2: do not support EDO mode

[Christophe Kerello]

Hello Miquel,

On 3/24/23 17:34, Christophe Kerello wrote:
> Hello Miquel,
> 
> On 3/24/23 17:25, Miquel Raynal wrote:
>> Hi Christophe,
>>
>> christophe.kerello@foss.st.com wrote on Fri, 24 Mar 2023 17:09:18 +0100:
>>
>>> FMC2 controller does not support EDO mode (timings mode 4 and 5).
>>>
>>> Signed-off-by: Christophe Kerello <christophe.kerello@foss.st.com>
>>> Fixes: 2cd457f328c1 ("mtd: rawnand: stm32_fmc2: add STM32 FMC2 NAND 
>>> flash controller driver")
>>> ---
>>>   drivers/mtd/nand/raw/stm32_fmc2_nand.c | 3 +++
>>>   1 file changed, 3 insertions(+)
>>>
>>> diff --git a/drivers/mtd/nand/raw/stm32_fmc2_nand.c 
>>> b/drivers/mtd/nand/raw/stm32_fmc2_nand.c
>>> index 5d627048c420..3abb63d00a0b 100644
>>> --- a/drivers/mtd/nand/raw/stm32_fmc2_nand.c
>>> +++ b/drivers/mtd/nand/raw/stm32_fmc2_nand.c
>>> @@ -1531,6 +1531,9 @@ static int 
>>> stm32_fmc2_nfc_setup_interface(struct nand_chip *chip, int chipnr,
>>>       if (IS_ERR(sdrt))
>>>           return PTR_ERR(sdrt);
>>> +    if (sdrt->tRC_min < 30000)
>>
>> When introducing NV-DDR support we as well added a timings.mode field,
>> perhaps you could use it?
> 
> Yes, I can use it. It will be done in V2.
> 
> Regards,
> Christophe Kerello.
> 

I had a look at Kernel LTS, and timings.mode was introduced on Kernel 
LTS 5.10. As this patch has also to be applied on Kernel LTS 5.4, my 
proposal is to send a new patch set. The first patch will be the current 
patch (fix for all Kernel LTS) and the second patch will use 
timings.mode instead of checking tRC_min timings for next Kernel 
delivery. Is this proposal acceptable?

Regards,
Christophe Kerello.

>>
>>> +        return -EOPNOTSUPP;
>>> +
>>>       if (chipnr == NAND_DATA_IFACE_CHECK_ONLY)
>>>           return 0;
>>
>>
>> Thanks,
>> Miquèl

Re: [PATCH] mtd: rawnand: stm32_fmc2: do not support EDO mode

[Miquel Raynal]

Hi Christophe,

christophe.kerello@foss.st.com wrote on Mon, 27 Mar 2023 10:02:13 +0200:

> Hello Miquel,
> 
> On 3/24/23 17:34, Christophe Kerello wrote:
> > Hello Miquel,
> > 
> > On 3/24/23 17:25, Miquel Raynal wrote:  
> >> Hi Christophe,
> >>
> >> christophe.kerello@foss.st.com wrote on Fri, 24 Mar 2023 17:09:18 +0100:
> >>  
> >>> FMC2 controller does not support EDO mode (timings mode 4 and 5).
> >>>
> >>> Signed-off-by: Christophe Kerello <christophe.kerello@foss.st.com>
> >>> Fixes: 2cd457f328c1 ("mtd: rawnand: stm32_fmc2: add STM32 FMC2 NAND >>> flash controller driver")
> >>> ---
> >>>   drivers/mtd/nand/raw/stm32_fmc2_nand.c | 3 +++
> >>>   1 file changed, 3 insertions(+)
> >>>
> >>> diff --git a/drivers/mtd/nand/raw/stm32_fmc2_nand.c >>> b/drivers/mtd/nand/raw/stm32_fmc2_nand.c
> >>> index 5d627048c420..3abb63d00a0b 100644
> >>> --- a/drivers/mtd/nand/raw/stm32_fmc2_nand.c
> >>> +++ b/drivers/mtd/nand/raw/stm32_fmc2_nand.c
> >>> @@ -1531,6 +1531,9 @@ static int >>> stm32_fmc2_nfc_setup_interface(struct nand_chip *chip, int chipnr,
> >>>       if (IS_ERR(sdrt))
> >>>           return PTR_ERR(sdrt);
> >>> +    if (sdrt->tRC_min < 30000)  
> >>
> >> When introducing NV-DDR support we as well added a timings.mode field,
> >> perhaps you could use it?  
> > 
> > Yes, I can use it. It will be done in V2.
> > 
> > Regards,
> > Christophe Kerello.
> >   
> 
> I had a look at Kernel LTS, and timings.mode was introduced on Kernel LTS 5.10. As this patch has also to be applied on Kernel LTS 5.4, my proposal is to send a new patch set. The first patch will be the current patch (fix for all Kernel LTS) and the second patch will use timings.mode instead of checking tRC_min timings for next Kernel delivery. Is this proposal acceptable?

Works for me!

Thanks,
Miquèl