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Message-ID: <10a208f1f34817a756bb20052537c683@codeaurora.org>
Date: Thu, 04 Nov 2021 15:00:28 +0800
From: tjiang@...eaurora.org
To: Marcel Holtmann <marcel@...tmann.org>
Cc: Johan Hedberg <johan.hedberg@...il.com>,
Luiz Augusto von Dentz <luiz.dentz@...il.com>,
Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
linux-bluetooth <linux-bluetooth@...r.kernel.org>,
MSM <linux-arm-msm@...r.kernel.org>,
Balakrishna Godavarthi <bgodavar@...eaurora.org>,
c-hbandi@...eaurora.org, Hemantg <hemantg@...eaurora.org>,
Matthias Kaehlcke <mka@...omium.org>,
Rocky Liao <rjliao@...eaurora.org>, zijuhu@...eaurora.org
Subject: Re: [PATCH v2] Bluetooth: btusb: using big-endian definition for
board_id in struct qca_version
Hi Marcel:
yeah , you are right, but in fact we mixing little-endian and
big-endian is defined by qc btsoc(have some reason), so host only should
be align with it , I will make another change , need your help to
review, thank you.
regards.
tim
On 2021-11-03 22:24, Marcel Holtmann wrote:
> Hi Tim,
>
>> As we name nvm file by using big-endian for boardID, so align host
>> with it.
>>
>> Signed-off-by: Tim Jiang <tjiang@...eaurora.org>
>> ---
>> drivers/bluetooth/btusb.c | 4 ++--
>> 1 file changed, 2 insertions(+), 2 deletions(-)
>>
>> diff --git a/drivers/bluetooth/btusb.c b/drivers/bluetooth/btusb.c
>> index 46d892bbde62..08a1c6d8390f 100644
>> --- a/drivers/bluetooth/btusb.c
>> +++ b/drivers/bluetooth/btusb.c
>> @@ -2883,7 +2883,7 @@ struct qca_version {
>> __le32 rom_version;
>> __le32 patch_version;
>> __le32 ram_version;
>> - __le16 board_id;
>> + __be16 board_id;
>> __le16 flag;
>> __u8 reserved[4];
>> } __packed;
>> @@ -3072,7 +3072,7 @@ static void btusb_generate_qca_nvm_name(char
>> *fwname, size_t max_size,
>> u16 flag = le16_to_cpu(ver->flag);
>>
>> if (((flag >> 8) & 0xff) == QCA_FLAG_MULTI_NVM) {
>> - u16 board_id = le16_to_cpu(ver->board_id);
>> + u16 board_id = be16_to_cpu(ver->board_id);
>> const char *variant;
>
> my original comment still stands. Are you sure you are doing this
> correctly. The in-memory layout of your NVM is mixed little-endian and
> big-endian? Really? Or do you want to convert back from host endian to
> big endian?
>
> You commit message text suggest that you have to do this:
>
> diff --git a/drivers/bluetooth/btusb.c b/drivers/bluetooth/btusb.c
> index 46d892bbde62..55a33a5fea56 100644
> --- a/drivers/bluetooth/btusb.c
> +++ b/drivers/bluetooth/btusb.c
> @@ -3090,7 +3090,7 @@ static void btusb_generate_qca_nvm_name(char
> *fwname, size_t max_size,
> rom_version, variant);
> } else {
> snprintf(fwname, max_size,
> "qca/nvm_usb_%08x%s_%04x.bin",
> - rom_version, variant, board_id);
> + rom_version, variant,
> cpu_to_be16(board_id));
> }
> } else {
> snprintf(fwname, max_size, "qca/nvm_usb_%08x.bin”,
>
> And really, I can not do this anymore. Write lengthy commit messages
> explaining your change in detail. I am not looking a patches anymore
> until they have a proper paragraph explaining the change and why it is
> correct.
>
> Also this change had v16 before I merged and even in that version I
> had to fix issues. Please stop wasting my time. I have no idea why
> this wasn’t caught earlier. It is a fundamental flaw. I am close to
> just reverting the previous patch since it seems it clearly needs more
> testing.
>
> Regards
>
> Marcel
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