* [U-Boot] [PATCH] s5p-mmc: Fix ambiguous setting of data transfer width
@ 2011-08-30 10:55 Chander Kashyap
2011-08-31 8:33 ` Jaehoon Chung
2011-09-01 1:23 ` Andy Fleming
0 siblings, 2 replies; 6+ messages in thread
From: Chander Kashyap @ 2011-08-30 10:55 UTC (permalink / raw)
To: u-boot
mmc data transfer width is set as following:
WIDE8[5]:
0 = Depend on WIDE4
1 = 8-bit mode
WIDE4[1]:
1 = 4-bit mode
0 = 1-bit mode
In case of 4-bit mode reset 8-bit mode and
in case of 1-bit mode reset 8-bit mode and 4-bit mode
Signed-off-by: Chander Kashyap <chander.kashyap@linaro.org>
---
drivers/mmc/s5p_mmc.c | 10 +++++++---
1 files changed, 7 insertions(+), 3 deletions(-)
diff --git a/drivers/mmc/s5p_mmc.c b/drivers/mmc/s5p_mmc.c
index 7786ecf..6e6ad08 100644
--- a/drivers/mmc/s5p_mmc.c
+++ b/drivers/mmc/s5p_mmc.c
@@ -368,12 +368,16 @@ static void mmc_set_ios(struct mmc *mmc)
* 1 = 4-bit mode
* 0 = 1-bit mode
*/
- if (mmc->bus_width == 8)
+ if (mmc->bus_width == 8) {
ctrl |= (1 << 5);
- else if (mmc->bus_width == 4)
+ ctrl &= ~(1 << 1);
+ } else if (mmc->bus_width == 4) {
ctrl |= (1 << 1);
- else
+ ctrl &= ~(1 << 5);
+ } else {
ctrl &= ~(1 << 1);
+ ctrl &= ~(1 << 5);
+ }
/*
* OUTEDGEINV[2]
--
1.7.4.1
^ permalink raw reply related [flat|nested] 6+ messages in thread* [U-Boot] [PATCH] s5p-mmc: Fix ambiguous setting of data transfer width
2011-08-30 10:55 [U-Boot] [PATCH] s5p-mmc: Fix ambiguous setting of data transfer width Chander Kashyap
@ 2011-08-31 8:33 ` Jaehoon Chung
2011-09-01 1:23 ` Andy Fleming
1 sibling, 0 replies; 6+ messages in thread
From: Jaehoon Chung @ 2011-08-31 8:33 UTC (permalink / raw)
To: u-boot
Hi Chander.
this patch is correct.
Acked-by: Jaehoon Chung <jh80.chung@samsung.com>
Chander Kashyap wrote:
> mmc data transfer width is set as following:
> WIDE8[5]:
> 0 = Depend on WIDE4
> 1 = 8-bit mode
> WIDE4[1]:
> 1 = 4-bit mode
> 0 = 1-bit mode
>
> In case of 4-bit mode reset 8-bit mode and
> in case of 1-bit mode reset 8-bit mode and 4-bit mode
>
> Signed-off-by: Chander Kashyap <chander.kashyap@linaro.org>
> ---
> drivers/mmc/s5p_mmc.c | 10 +++++++---
> 1 files changed, 7 insertions(+), 3 deletions(-)
>
> diff --git a/drivers/mmc/s5p_mmc.c b/drivers/mmc/s5p_mmc.c
> index 7786ecf..6e6ad08 100644
> --- a/drivers/mmc/s5p_mmc.c
> +++ b/drivers/mmc/s5p_mmc.c
> @@ -368,12 +368,16 @@ static void mmc_set_ios(struct mmc *mmc)
> * 1 = 4-bit mode
> * 0 = 1-bit mode
> */
> - if (mmc->bus_width == 8)
> + if (mmc->bus_width == 8) {
> ctrl |= (1 << 5);
> - else if (mmc->bus_width == 4)
> + ctrl &= ~(1 << 1);
> + } else if (mmc->bus_width == 4) {
> ctrl |= (1 << 1);
> - else
> + ctrl &= ~(1 << 5);
> + } else {
> ctrl &= ~(1 << 1);
> + ctrl &= ~(1 << 5);
> + }
>
> /*
> * OUTEDGEINV[2]
^ permalink raw reply [flat|nested] 6+ messages in thread* [U-Boot] [PATCH] s5p-mmc: Fix ambiguous setting of data transfer width
2011-08-30 10:55 [U-Boot] [PATCH] s5p-mmc: Fix ambiguous setting of data transfer width Chander Kashyap
2011-08-31 8:33 ` Jaehoon Chung
@ 2011-09-01 1:23 ` Andy Fleming
2011-09-01 2:26 ` Minkyu Kang
1 sibling, 1 reply; 6+ messages in thread
From: Andy Fleming @ 2011-09-01 1:23 UTC (permalink / raw)
To: u-boot
On Tue, Aug 30, 2011 at 5:55 AM, Chander Kashyap
<chander.kashyap@linaro.org> wrote:
> mmc data transfer width is set as following:
> WIDE8[5]:
> 0 = Depend on WIDE4
> 1 = 8-bit mode
> WIDE4[1]:
> 1 = 4-bit mode
> 0 = 1-bit mode
>
> In case of 4-bit mode reset 8-bit mode and
> in case of 1-bit mode reset 8-bit mode and 4-bit mode
>
> Signed-off-by: Chander Kashyap <chander.kashyap@linaro.org>
> ---
> ?drivers/mmc/s5p_mmc.c | ? 10 +++++++---
> ?1 files changed, 7 insertions(+), 3 deletions(-)
>
> diff --git a/drivers/mmc/s5p_mmc.c b/drivers/mmc/s5p_mmc.c
> index 7786ecf..6e6ad08 100644
> --- a/drivers/mmc/s5p_mmc.c
> +++ b/drivers/mmc/s5p_mmc.c
> @@ -368,12 +368,16 @@ static void mmc_set_ios(struct mmc *mmc)
> ? ? ? ? * 1 = 4-bit mode
> ? ? ? ? * 0 = 1-bit mode
> ? ? ? ? */
> - ? ? ? if (mmc->bus_width == 8)
> + ? ? ? if (mmc->bus_width == 8) {
> ? ? ? ? ? ? ? ?ctrl |= (1 << 5);
> - ? ? ? else if (mmc->bus_width == 4)
> + ? ? ? ? ? ? ? ctrl &= ~(1 << 1);
I know these were like this before, but those numbers are awfully
magical. You should really define constants for them.
Also, this seems like a very confusing way to do this? Why not clear
both bits@the start, and then set the one that is needed?
Andy
^ permalink raw reply [flat|nested] 6+ messages in thread* [U-Boot] [PATCH] s5p-mmc: Fix ambiguous setting of data transfer width
2011-09-01 1:23 ` Andy Fleming
@ 2011-09-01 2:26 ` Minkyu Kang
2011-09-01 5:51 ` Wolfgang Denk
0 siblings, 1 reply; 6+ messages in thread
From: Minkyu Kang @ 2011-09-01 2:26 UTC (permalink / raw)
To: u-boot
Dear Andy Fleming,
On 1 September 2011 10:23, Andy Fleming <afleming@gmail.com> wrote:
> On Tue, Aug 30, 2011 at 5:55 AM, Chander Kashyap
> <chander.kashyap@linaro.org> wrote:
>> mmc data transfer width is set as following:
>> WIDE8[5]:
>> 0 = Depend on WIDE4
>> 1 = 8-bit mode
>> WIDE4[1]:
>> 1 = 4-bit mode
>> 0 = 1-bit mode
>>
>> In case of 4-bit mode reset 8-bit mode and
>> in case of 1-bit mode reset 8-bit mode and 4-bit mode
>>
>> Signed-off-by: Chander Kashyap <chander.kashyap@linaro.org>
>> ---
>> ?drivers/mmc/s5p_mmc.c | ? 10 +++++++---
>> ?1 files changed, 7 insertions(+), 3 deletions(-)
>>
>> diff --git a/drivers/mmc/s5p_mmc.c b/drivers/mmc/s5p_mmc.c
>> index 7786ecf..6e6ad08 100644
>> --- a/drivers/mmc/s5p_mmc.c
>> +++ b/drivers/mmc/s5p_mmc.c
>> @@ -368,12 +368,16 @@ static void mmc_set_ios(struct mmc *mmc)
>> ? ? ? ? * 1 = 4-bit mode
>> ? ? ? ? * 0 = 1-bit mode
>> ? ? ? ? */
>> - ? ? ? if (mmc->bus_width == 8)
>> + ? ? ? if (mmc->bus_width == 8) {
>> ? ? ? ? ? ? ? ?ctrl |= (1 << 5);
>> - ? ? ? else if (mmc->bus_width == 4)
>> + ? ? ? ? ? ? ? ctrl &= ~(1 << 1);
>
>
> I know these were like this before, but those numbers are awfully
> magical. You should really define constants for them.
We decided to use comments instead of defines.
>
> Also, this seems like a very confusing way to do this? Why not clear
> both bits at the start, and then set the one that is needed?
Agreed.
Thanks
Minkyu Kang
--
from. prom.
www.promsoft.net
^ permalink raw reply [flat|nested] 6+ messages in thread* [U-Boot] [PATCH] s5p-mmc: Fix ambiguous setting of data transfer width
2011-09-01 2:26 ` Minkyu Kang
@ 2011-09-01 5:51 ` Wolfgang Denk
2011-09-02 8:09 ` Minkyu Kang
0 siblings, 1 reply; 6+ messages in thread
From: Wolfgang Denk @ 2011-09-01 5:51 UTC (permalink / raw)
To: u-boot
Dear Minkyu Kang,
In message <CALrBrZ3H+k8bu-1OwF5C5BNHuphj_J8jXXV2xgu6jPO5gmJELg@mail.gmail.com> you wrote:
>
> > I know these were like this before, but those numbers are awfully
> > magical. You should really define constants for them.
>
> We decided to use comments instead of defines.
And now we ask you to fix this, because we don;t want such magic
constants. So please go on and change this.
Thanks.
Wolfgang Denk
--
DENX Software Engineering GmbH, MD: Wolfgang Denk & Detlev Zundel
HRB 165235 Munich, Office: Kirchenstr.5, D-82194 Groebenzell, Germany
Phone: (+49)-8142-66989-10 Fax: (+49)-8142-66989-80 Email: wd at denx.de
About the use of language: it is impossible to sharpen a pencil with
a blunt ax. It is equally vain to try to do it with ten blunt axes
instead. -- Edsger Dijkstra
^ permalink raw reply [flat|nested] 6+ messages in thread
* [U-Boot] [PATCH] s5p-mmc: Fix ambiguous setting of data transfer width
2011-09-01 5:51 ` Wolfgang Denk
@ 2011-09-02 8:09 ` Minkyu Kang
0 siblings, 0 replies; 6+ messages in thread
From: Minkyu Kang @ 2011-09-02 8:09 UTC (permalink / raw)
To: u-boot
Dear Wolfgang Denk,
On 1 September 2011 14:51, Wolfgang Denk <wd@denx.de> wrote:
> Dear Minkyu Kang,
>
> In message <CALrBrZ3H+k8bu-1OwF5C5BNHuphj_J8jXXV2xgu6jPO5gmJELg@mail.gmail.com> you wrote:
>>
>> > I know these were like this before, but those numbers are awfully
>> > magical. You should really define constants for them.
>>
>> We decided to use comments instead of defines.
>
> And now we ask you to fix this, because we don;t want such magic
> constants. ?So please go on and change this.
>
OK.
Thanks.
Minkyu Kang
--
from. prom.
www.promsoft.net
^ permalink raw reply [flat|nested] 6+ messages in thread
end of thread, other threads:[~2011-09-02 8:09 UTC | newest]
Thread overview: 6+ messages (download: mbox.gz / follow: Atom feed)
-- links below jump to the message on this page --
2011-08-30 10:55 [U-Boot] [PATCH] s5p-mmc: Fix ambiguous setting of data transfer width Chander Kashyap
2011-08-31 8:33 ` Jaehoon Chung
2011-09-01 1:23 ` Andy Fleming
2011-09-01 2:26 ` Minkyu Kang
2011-09-01 5:51 ` Wolfgang Denk
2011-09-02 8:09 ` Minkyu Kang
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