From: Yong Li <[email protected]>
Signed-off-by: Yong Li <[email protected]>
---
drivers/mmc/card/block.c | 3 ++-
1 file changed, 2 insertions(+), 1 deletion(-)
diff --git a/drivers/mmc/card/block.c b/drivers/mmc/card/block.c
index 452782b..d9e3c45 100644
--- a/drivers/mmc/card/block.c
+++ b/drivers/mmc/card/block.c
@@ -1366,7 +1366,8 @@ static void mmc_blk_rw_rq_prep(struct mmc_queue_req *mqrq,
bool do_rel_wr = ((req->cmd_flags & REQ_FUA) ||
(req->cmd_flags & REQ_META)) &&
(rq_data_dir(req) == WRITE) &&
- (md->flags & MMC_BLK_REL_WR);
+ (md->flags & MMC_BLK_REL_WR) &&
+ !(card->quirks & MMC_QUIRK_BLK_NO_CMD23);
memset(brq, 0, sizeof(struct mmc_blk_request));
brq->mrq.cmd = &brq->cmd;
--
2.1.0
?? 2015/8/14 15:30, [email protected] д??:
> From: Yong Li <[email protected]>
>
> Signed-off-by: Yong Li <[email protected]>
> ---
> drivers/mmc/card/block.c | 3 ++-
> 1 file changed, 2 insertions(+), 1 deletion(-)
>
> diff --git a/drivers/mmc/card/block.c b/drivers/mmc/card/block.c
> index 452782b..d9e3c45 100644
> --- a/drivers/mmc/card/block.c
> +++ b/drivers/mmc/card/block.c
> @@ -1366,7 +1366,8 @@ static void mmc_blk_rw_rq_prep(struct mmc_queue_req *mqrq,
> bool do_rel_wr = ((req->cmd_flags & REQ_FUA) ||
> (req->cmd_flags & REQ_META)) &&
> (rq_data_dir(req) == WRITE) &&
> - (md->flags & MMC_BLK_REL_WR);
> + (md->flags & MMC_BLK_REL_WR) &&
> + !(card->quirks & MMC_QUIRK_BLK_NO_CMD23);
Hi Yong,
pls check that code below.
MMC_BLK_REL_WR will not be enabled if we know this card CANNOT support
CMD23 form SCR. AND?? "card->quirks & MMC_QUIRK_BLK_NO_CMD23" would be
checked here as well. So I think your code is unnecessary.
if ((md->flags & MMC_BLK_CMD23) && mmc_op_multi(brq->cmd.opcode) &&
(do_rel_wr || !(card->quirks & MMC_QUIRK_BLK_NO_CMD23) ||
do_data_tag)) {
brq->sbc.opcode = MMC_SET_BLOCK_COUNT;
brq->sbc.arg = brq->data.blocks |
(do_rel_wr ? (1 << 31) : 0) |
(do_data_tag ? (1 << 29) : 0);
brq->sbc.flags = MMC_RSP_R1 | MMC_CMD_AC;
brq->mrq.sbc = &brq->sbc;
}
Thanks.
Shawn
>
> memset(brq, 0, sizeof(struct mmc_blk_request));
> brq->mrq.cmd = &brq->cmd;
>
--
Shawn Lin
Thanks Shawn. Please help to check the below in the mmc_blk_rw_rq_prep:
if (do_rel_wr)
mmc_apply_rel_rw(brq, card, req);
I think we need to set the do_rel_wr to false( at the beginning of this function) if the card does not support the CMD23. The above code is executed before the "if ((md->flags & MMC_BLK_CMD23)" code.
Thanks,
Yong Li
----------------------------------------
> Subject: Re: [PATCH] mmc: block: disable the reliable write If the card does not support CMD23
> To: [email protected]; [email protected]; [email protected]; [email protected]; [email protected]
> CC: [email protected]
> From: [email protected]
> Date: Fri, 14 Aug 2015 16:13:02 +0800
>
> 在 2015/8/14 15:30, [email protected] 写道:
>> From: Yong Li <[email protected]>
>>
>> Signed-off-by: Yong Li <[email protected]>
>> ---
>> drivers/mmc/card/block.c | 3 ++-
>> 1 file changed, 2 insertions(+), 1 deletion(-)
>>
>> diff --git a/drivers/mmc/card/block.c b/drivers/mmc/card/block.c
>> index 452782b..d9e3c45 100644
>> --- a/drivers/mmc/card/block.c
>> +++ b/drivers/mmc/card/block.c
>> @@ -1366,7 +1366,8 @@ static void mmc_blk_rw_rq_prep(struct mmc_queue_req *mqrq,
>> bool do_rel_wr = ((req->cmd_flags & REQ_FUA) ||
>> (req->cmd_flags & REQ_META)) &&
>> (rq_data_dir(req) == WRITE) &&
>> - (md->flags & MMC_BLK_REL_WR);
>> + (md->flags & MMC_BLK_REL_WR) &&
>> + !(card->quirks & MMC_QUIRK_BLK_NO_CMD23);
>
> Hi Yong,
>
> pls check that code below.
>
> MMC_BLK_REL_WR will not be enabled if we know this card CANNOT support
> CMD23 form SCR. AND， "card->quirks & MMC_QUIRK_BLK_NO_CMD23" would be
> checked here as well. So I think your code is unnecessary.
>
> if ((md->flags & MMC_BLK_CMD23) && mmc_op_multi(brq->cmd.opcode) &&
> (do_rel_wr || !(card->quirks & MMC_QUIRK_BLK_NO_CMD23) ||
> do_data_tag)) {
> brq->sbc.opcode = MMC_SET_BLOCK_COUNT;
> brq->sbc.arg = brq->data.blocks |
> (do_rel_wr ? (1 << 31) : 0) |
> (do_data_tag ? (1 << 29) : 0);
> brq->sbc.flags = MMC_RSP_R1 | MMC_CMD_AC;
> brq->mrq.sbc = &brq->sbc;
> }
>
> Thanks.
> Shawn
>
>>
>> memset(brq, 0, sizeof(struct mmc_blk_request));
>> brq->mrq.cmd = &brq->cmd;
>>
>
>
> --
> Shawn Lin
>
????{.n?+???????+%?????ݶ??w??{.n?+????{??G?????{ay? ʇڙ?,j??f???h?????????z_??(?階?ݢj"???m??????G????????????&???~???iO???z??v?^?m???? ????????I?
On 2015/8/15 20:14, LIYONG wrote:
> Thanks Shawn. Please help to check the below in the mmc_blk_rw_rq_prep:
> if (do_rel_wr)
> mmc_apply_rel_rw(brq, card, req);
>
> I think we need to set the do_rel_wr to false( at the beginning of this function) if the card does not support the CMD23. The above code is executed before the "if ((md->flags & MMC_BLK_CMD23)" code.
>
ok, it makes sense.:)
> Thanks,
> Yong Li
> ----------------------------------------
>> Subject: Re: [PATCH] mmc: block: disable the reliable write If the card does not support CMD23
>> To: [email protected]; [email protected]; [email protected]; [email protected]; [email protected]
>> CC: [email protected]
>> From: [email protected]
>> Date: Fri, 14 Aug 2015 16:13:02 +0800
>>
>> 在 2015/8/14 15:30, [email protected] 写道:
>>> From: Yong Li <[email protected]>
>>>
>>> Signed-off-by: Yong Li <[email protected]>
>>> ---
>>> drivers/mmc/card/block.c | 3 ++-
>>> 1 file changed, 2 insertions(+), 1 deletion(-)
>>>
>>> diff --git a/drivers/mmc/card/block.c b/drivers/mmc/card/block.c
>>> index 452782b..d9e3c45 100644
>>> --- a/drivers/mmc/card/block.c
>>> +++ b/drivers/mmc/card/block.c
>>> @@ -1366,7 +1366,8 @@ static void mmc_blk_rw_rq_prep(struct mmc_queue_req *mqrq,
>>> bool do_rel_wr = ((req->cmd_flags & REQ_FUA) ||
>>> (req->cmd_flags & REQ_META)) &&
>>> (rq_data_dir(req) == WRITE) &&
>>> - (md->flags & MMC_BLK_REL_WR);
>>> + (md->flags & MMC_BLK_REL_WR) &&
>>> + !(card->quirks & MMC_QUIRK_BLK_NO_CMD23);
>>
>> Hi Yong,
>>
>> pls check that code below.
>>
>> MMC_BLK_REL_WR will not be enabled if we know this card CANNOT support
>> CMD23 form SCR. AND， "card->quirks & MMC_QUIRK_BLK_NO_CMD23" would be
>> checked here as well. So I think your code is unnecessary.
>>
>> if ((md->flags & MMC_BLK_CMD23) && mmc_op_multi(brq->cmd.opcode) &&
>> (do_rel_wr || !(card->quirks & MMC_QUIRK_BLK_NO_CMD23) ||
>> do_data_tag)) {
>> brq->sbc.opcode = MMC_SET_BLOCK_COUNT;
>> brq->sbc.arg = brq->data.blocks |
>> (do_rel_wr ? (1 << 31) : 0) |
>> (do_data_tag ? (1 << 29) : 0);
>> brq->sbc.flags = MMC_RSP_R1 | MMC_CMD_AC;
>> brq->mrq.sbc = &brq->sbc;
>> }
>>
>> Thanks.
>> Shawn
>>
>>>
>>> memset(brq, 0, sizeof(struct mmc_blk_request));
>>> brq->mrq.cmd = &brq->cmd;
>>>
>>
>>
>> --
>> Shawn Lin
>>
> N�����r��y���b�X��ǧv�^�){.n�+����{��g"��^n�r���z���h����&�� �G���h�(�階�ݢj"���m�����z�ޖ���f���h���~�mml==
>
--
Shawn Lin
On 14 August 2015 at 09:30, <[email protected]> wrote:
> From: Yong Li <[email protected]>
>
> Signed-off-by: Yong Li <[email protected]>
> ---
> drivers/mmc/card/block.c | 3 ++-
> 1 file changed, 2 insertions(+), 1 deletion(-)
>
> diff --git a/drivers/mmc/card/block.c b/drivers/mmc/card/block.c
> index 452782b..d9e3c45 100644
> --- a/drivers/mmc/card/block.c
> +++ b/drivers/mmc/card/block.c
> @@ -1366,7 +1366,8 @@ static void mmc_blk_rw_rq_prep(struct mmc_queue_req *mqrq,
> bool do_rel_wr = ((req->cmd_flags & REQ_FUA) ||
> (req->cmd_flags & REQ_META)) &&
> (rq_data_dir(req) == WRITE) &&
> - (md->flags & MMC_BLK_REL_WR);
> + (md->flags & MMC_BLK_REL_WR) &&
> + !(card->quirks & MMC_QUIRK_BLK_NO_CMD23);
Further down in mmc_blk_rw_rq_prep() we check for
MMC_QUIRK_BLK_NO_CMD23. That check becomes redundant after this
change, please remove that check as a part of this patch as well.
>
> memset(brq, 0, sizeof(struct mmc_blk_request));
> brq->mrq.cmd = &brq->cmd;
> --
> 2.1.0
>
Kind regards
Uffe
Hi Uffe,
The bool variable?do_rel_wr is used on line 1408 and line 1436:
if (brq->data.blocks> 1 || do_rel_wr) {
/* SPI multiblock writes terminate using a special
* token, not a STOP_TRANSMISSION request.
*/
if (do_rel_wr)
mmc_apply_rel_rw(brq, card, req);
If a card does not support CMD23, I think we need to set the do_rel_wr to false at the beginning of this?mmc_blk_rw_rq_prep function
Thanks,
Yong Li
----------------------------------------
> Date: Tue, 25 Aug 2015 14:06:43 +0200
> Subject: Re: [PATCH] mmc: block: disable the reliable write If the card does not support CMD23
> From: [email protected]
> To: [email protected]
> CC: [email protected]; [email protected]; [email protected]
>
> On 14 August 2015 at 09:30, <[email protected]> wrote:
>> From: Yong Li <[email protected]>
>>
>> Signed-off-by: Yong Li <[email protected]>
>> ---
>> drivers/mmc/card/block.c | 3 ++-
>> 1 file changed, 2 insertions(+), 1 deletion(-)
>>
>> diff --git a/drivers/mmc/card/block.c b/drivers/mmc/card/block.c
>> index 452782b..d9e3c45 100644
>> --- a/drivers/mmc/card/block.c
>> +++ b/drivers/mmc/card/block.c
>> @@ -1366,7 +1366,8 @@ static void mmc_blk_rw_rq_prep(struct mmc_queue_req *mqrq,
>> bool do_rel_wr = ((req->cmd_flags & REQ_FUA) ||
>> (req->cmd_flags & REQ_META)) &&
>> (rq_data_dir(req) == WRITE) &&
>> - (md->flags & MMC_BLK_REL_WR);
>> + (md->flags & MMC_BLK_REL_WR) &&
>> + !(card->quirks & MMC_QUIRK_BLK_NO_CMD23);
>
> Further down in mmc_blk_rw_rq_prep() we check for
> MMC_QUIRK_BLK_NO_CMD23. That check becomes redundant after this
> change, please remove that check as a part of this patch as well.
>
>>
>> memset(brq, 0, sizeof(struct mmc_blk_request));
>> brq->mrq.cmd = &brq->cmd;
>> --
>> 2.1.0
>>
>
> Kind regards
> Uffe
-
On 2015/8/26 14:15, LIYONG wrote:
> Hi Uffe,
>
> The bool variable do_rel_wr is used on line 1408 and line 1436:
> if (brq->data.blocks> 1 || do_rel_wr) {
> /* SPI multiblock writes terminate using a special
> * token, not a STOP_TRANSMISSION request.
> */
>
> if (do_rel_wr)
> mmc_apply_rel_rw(brq, card, req);
>
> If a card does not support CMD23, I think we need to set the do_rel_wr to false at the beginning of this mmc_blk_rw_rq_prep function
Hi Yong,
You miss the point, Ulf means you should remove
"(do_rel_wr || !(card->quirks & MMC_QUIRK_BLK_NO_CMD23)" as well.
No need to check card->quirks & MMC_QUIRK_BLK_NO_CMD23 twice, you have
did it while checking do_rel_wr, right?
bool do_rel_wr = ((req->cmd_flags & REQ_FUA) ||
(req->cmd_flags & REQ_META)) &&
(rq_data_dir(req) == WRITE) &&
- (md->flags & MMC_BLK_REL_WR);
+ (md->flags & MMC_BLK_REL_WR) &&
+ !(card->quirks & MMC_QUIRK_BLK_NO_CMD23);
>
> Thanks,
> Yong Li
> ----------------------------------------
>> Date: Tue, 25 Aug 2015 14:06:43 +0200
>> Subject: Re: [PATCH] mmc: block: disable the reliable write If the card does not support CMD23
>> From: [email protected]
>> To: [email protected]
>> CC: [email protected]; [email protected]; [email protected]
>>
>> On 14 August 2015 at 09:30, <[email protected]> wrote:
>>> From: Yong Li <[email protected]>
>>>
>>> Signed-off-by: Yong Li <[email protected]>
>>> ---
>>> drivers/mmc/card/block.c | 3 ++-
>>> 1 file changed, 2 insertions(+), 1 deletion(-)
>>>
>>> diff --git a/drivers/mmc/card/block.c b/drivers/mmc/card/block.c
>>> index 452782b..d9e3c45 100644
>>> --- a/drivers/mmc/card/block.c
>>> +++ b/drivers/mmc/card/block.c
>>> @@ -1366,7 +1366,8 @@ static void mmc_blk_rw_rq_prep(struct mmc_queue_req *mqrq,
>>> bool do_rel_wr = ((req->cmd_flags & REQ_FUA) ||
>>> (req->cmd_flags & REQ_META)) &&
>>> (rq_data_dir(req) == WRITE) &&
>>> - (md->flags & MMC_BLK_REL_WR);
>>> + (md->flags & MMC_BLK_REL_WR) &&
>>> + !(card->quirks & MMC_QUIRK_BLK_NO_CMD23);
>>
>> Further down in mmc_blk_rw_rq_prep() we check for
>> MMC_QUIRK_BLK_NO_CMD23. That check becomes redundant after this
>> change, please remove that check as a part of this patch as well.
>>
>>>
>>> memset(brq, 0, sizeof(struct mmc_blk_request));
>>> brq->mrq.cmd = &brq->cmd;
>>> --
>>> 2.1.0
>>>
>>
>> Kind regards
>> Uffe
> --
> To unsubscribe from this list: send the line "unsubscribe linux-mmc" in
> the body of a message to [email protected]
> More majordomo info at http://vger.kernel.org/majordomo-info.html
>
>
>
--
Best Regards
Shawn Lin
Thanks Shawn. I got your point. You mean we can remove the?|| !(card->quirks & MMC_QUIRK_BLK_NO_CMD23) at line 1468.
But considering this case: The do_rel_wr = false and the card does support CMD23.
do_rel_wr = false;?
!(card->quirks & MMC_QUIRK_BLK_NO_CMD23) = true;
At line 1468,?do_rel_wr || !(card->quirks & MMC_QUIRK_BLK_NO_CMD23) should be true;
If re remove the?|| !(card->quirks & MMC_QUIRK_BLK_NO_CMD23), it will be false
It seems that we cannot modify the line 1468?
Thanks,
Yong Li
----------------------------------------
> Subject: Re: [PATCH] mmc: block: disable the reliable write If the card does not support CMD23
> To: [email protected]; [email protected]
> CC: [email protected]; [email protected]; [email protected]; [email protected]
> From: [email protected]
> Date: Wed, 26 Aug 2015 15:20:11 +0800
>
> On 2015/8/26 14:15, LIYONG wrote:
>> Hi Uffe,
>>
>> The bool variable do_rel_wr is used on line 1408 and line 1436:
>> if (brq->data.blocks> 1 || do_rel_wr) {
>> /* SPI multiblock writes terminate using a special
>> * token, not a STOP_TRANSMISSION request.
>> */
>>
>> if (do_rel_wr)
>> mmc_apply_rel_rw(brq, card, req);
>>
>> If a card does not support CMD23, I think we need to set the do_rel_wr to false at the beginning of this mmc_blk_rw_rq_prep function
>
> Hi Yong,
>
> You miss the point, Ulf means you should remove
> "(do_rel_wr || !(card->quirks & MMC_QUIRK_BLK_NO_CMD23)" as well.
>
> No need to check card->quirks & MMC_QUIRK_BLK_NO_CMD23 twice, you have
> did it while checking do_rel_wr, right?
>
> bool do_rel_wr = ((req->cmd_flags & REQ_FUA) ||
> (req->cmd_flags & REQ_META)) &&
> (rq_data_dir(req) == WRITE) &&
> - (md->flags & MMC_BLK_REL_WR);
> + (md->flags & MMC_BLK_REL_WR) &&
> + !(card->quirks & MMC_QUIRK_BLK_NO_CMD23);
>
>>
>> Thanks,
>> Yong Li
>> ----------------------------------------
>>> Date: Tue, 25 Aug 2015 14:06:43 +0200
>>> Subject: Re: [PATCH] mmc: block: disable the reliable write If the card does not support CMD23
>>> From: [email protected]
>>> To: [email protected]
>>> CC: [email protected]; [email protected]; [email protected]
>>>
>>> On 14 August 2015 at 09:30, <[email protected]> wrote:
>>>> From: Yong Li <[email protected]>
>>>>
>>>> Signed-off-by: Yong Li <[email protected]>
>>>> ---
>>>> drivers/mmc/card/block.c | 3 ++-
>>>> 1 file changed, 2 insertions(+), 1 deletion(-)
>>>>
>>>> diff --git a/drivers/mmc/card/block.c b/drivers/mmc/card/block.c
>>>> index 452782b..d9e3c45 100644
>>>> --- a/drivers/mmc/card/block.c
>>>> +++ b/drivers/mmc/card/block.c
>>>> @@ -1366,7 +1366,8 @@ static void mmc_blk_rw_rq_prep(struct mmc_queue_req *mqrq,
>>>> bool do_rel_wr = ((req->cmd_flags & REQ_FUA) ||
>>>> (req->cmd_flags & REQ_META)) &&
>>>> (rq_data_dir(req) == WRITE) &&
>>>> - (md->flags & MMC_BLK_REL_WR);
>>>> + (md->flags & MMC_BLK_REL_WR) &&
>>>> + !(card->quirks & MMC_QUIRK_BLK_NO_CMD23);
>>>
>>> Further down in mmc_blk_rw_rq_prep() we check for
>>> MMC_QUIRK_BLK_NO_CMD23. That check becomes redundant after this
>>> change, please remove that check as a part of this patch as well.
>>>
>>>>
>>>> memset(brq, 0, sizeof(struct mmc_blk_request));
>>>> brq->mrq.cmd = &brq->cmd;
>>>> --
>>>> 2.1.0
>>>>
>>>
>>> Kind regards
>>> Uffe
>> --
>> To unsubscribe from this list: send the line "unsubscribe linux-mmc" in
>> the body of a message to [email protected]
>> More majordomo info at http://vger.kernel.org/majordomo-info.html
>>
>>
>>
>
>
> --
> Best Regards
> Shawn Lin
>
-
On 25 August 2015 at 14:06, Ulf Hansson <[email protected]> wrote:
> On 14 August 2015 at 09:30, <[email protected]> wrote:
>> From: Yong Li <[email protected]>
>>
>> Signed-off-by: Yong Li <[email protected]>
>> ---
>> drivers/mmc/card/block.c | 3 ++-
>> 1 file changed, 2 insertions(+), 1 deletion(-)
>>
>> diff --git a/drivers/mmc/card/block.c b/drivers/mmc/card/block.c
>> index 452782b..d9e3c45 100644
>> --- a/drivers/mmc/card/block.c
>> +++ b/drivers/mmc/card/block.c
>> @@ -1366,7 +1366,8 @@ static void mmc_blk_rw_rq_prep(struct mmc_queue_req *mqrq,
>> bool do_rel_wr = ((req->cmd_flags & REQ_FUA) ||
>> (req->cmd_flags & REQ_META)) &&
>> (rq_data_dir(req) == WRITE) &&
>> - (md->flags & MMC_BLK_REL_WR);
>> + (md->flags & MMC_BLK_REL_WR) &&
>> + !(card->quirks & MMC_QUIRK_BLK_NO_CMD23);
>
> Further down in mmc_blk_rw_rq_prep() we check for
> MMC_QUIRK_BLK_NO_CMD23. That check becomes redundant after this
> change, please remove that check as a part of this patch as well.
>
>>
>> memset(brq, 0, sizeof(struct mmc_blk_request));
>> brq->mrq.cmd = &brq->cmd;
>> --
>> 2.1.0
>>
>
Please ignore my previous answer. MMC_QUIRK_BLK_NO_CMD23 is intended
to indicate to the mmc block layer whether using CMD23 for regular
block IO request could have a performance impact for some cards. If
that's the case we don't use it - except when using reliable write!
So this patch is just plain wrong.
Kind regards
Uffe
Hi Uffe,
Since?Reliable Write depends on the CMD23. I think we need to disable?Reliable Write if the card does not support CMD23(due to performance impact issue), so I add this patch.
Do you think we still need to enable?Reliable Write even if the card does not support CMD23?
Thanks,
Yong Li
----------------------------------------
> Date: Thu, 27 Aug 2015 15:22:44 +0200
> Subject: Re: [PATCH] mmc: block: disable the reliable write If the card does not support CMD23
> From: [email protected]
> To: [email protected]
> CC: [email protected]; [email protected]; [email protected]
>
> On 25 August 2015 at 14:06, Ulf Hansson <[email protected]> wrote:
>> On 14 August 2015 at 09:30, <[email protected]> wrote:
>>> From: Yong Li <[email protected]>
>>>
>>> Signed-off-by: Yong Li <[email protected]>
>>> ---
>>> drivers/mmc/card/block.c | 3 ++-
>>> 1 file changed, 2 insertions(+), 1 deletion(-)
>>>
>>> diff --git a/drivers/mmc/card/block.c b/drivers/mmc/card/block.c
>>> index 452782b..d9e3c45 100644
>>> --- a/drivers/mmc/card/block.c
>>> +++ b/drivers/mmc/card/block.c
>>> @@ -1366,7 +1366,8 @@ static void mmc_blk_rw_rq_prep(struct mmc_queue_req *mqrq,
>>> bool do_rel_wr = ((req->cmd_flags & REQ_FUA) ||
>>> (req->cmd_flags & REQ_META)) &&
>>> (rq_data_dir(req) == WRITE) &&
>>> - (md->flags & MMC_BLK_REL_WR);
>>> + (md->flags & MMC_BLK_REL_WR) &&
>>> + !(card->quirks & MMC_QUIRK_BLK_NO_CMD23);
>>
>> Further down in mmc_blk_rw_rq_prep() we check for
>> MMC_QUIRK_BLK_NO_CMD23. That check becomes redundant after this
>> change, please remove that check as a part of this patch as well.
>>
>>>
>>> memset(brq, 0, sizeof(struct mmc_blk_request));
>>> brq->mrq.cmd = &brq->cmd;
>>> --
>>> 2.1.0
>>>
>>
>
> Please ignore my previous answer. MMC_QUIRK_BLK_NO_CMD23 is intended
> to indicate to the mmc block layer whether using CMD23 for regular
> block IO request could have a performance impact for some cards. If
> that's the case we don't use it - except when using reliable write!
>
> So this patch is just plain wrong.
>
> Kind regards
> Uffe
-