-----Original Message----- From: Tom Rini [mailto:trini@konsulko.com] Sent: Tuesday, January 19, 2016 11:59 PM To: Yangbo Lu Cc: york sun; Andy Fleming; U-Boot list Subject: Re: [U-Boot] [v2] mmc: fsl_esdhc: fix mmc read/write error on T4080
On Mon, Jan 18, 2016 at 07:18:59AM +0000, Yangbo Lu wrote:
-----Original Message----- From: Tom Rini [mailto:trini@konsulko.com] Sent: Friday, January 15, 2016 2:09 AM To: york sun Cc: Andy Fleming; Yangbo Lu; U-Boot list Subject: Re: [U-Boot] [v2] mmc: fsl_esdhc: fix mmc read/write error on T4080
On Thu, Jan 14, 2016 at 05:51:32PM +0000, york sun wrote:
On 01/08/2016 04:23 PM, Andy Fleming wrote:
On Thu, Jan 7, 2016 at 2:50 AM, Yangbo Lu yangbo.lu@nxp.com
wrote:
Fill the right command type when using CMD12 to stop data
transfer.
Signed-off-by: Yangbo Lu yangbo.lu@nxp.com
Changes for v2: - Removed fix for T4160 because other patch had done that
drivers/mmc/fsl_esdhc.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/drivers/mmc/fsl_esdhc.c b/drivers/mmc/fsl_esdhc.c index c5054d6..16fb01a 100644 --- a/drivers/mmc/fsl_esdhc.c +++ b/drivers/mmc/fsl_esdhc.c @@ -107,7 +107,7 @@ static uint esdhc_xfertyp(struct mmc_cmd *cmd, struct mmc_data *data)
#if defined(CONFIG_MX53) || defined(CONFIG_PPC_T4240) || \ defined(CONFIG_LS102XA) || defined(CONFIG_FSL_LAYERSCAPE) ||
\
defined(CONFIG_PPC_T4160)
defined(CONFIG_PPC_T4160) || defined(CONFIG_PPC_T4080) if (cmd->cmdidx == MMC_CMD_STOP_TRANSMISSION) xfertyp |= XFERTYP_CMDTYP_ABORT; #endifThese sorts of chip-specific #ifdefs are very hard to maintain. It would be far better if there were a single define, like:
#ifdef CONFIG_FSL_ESDHC_USES_ABORT_TO_STOP
And then define that on any system that needs this code. With the current version, I have no idea why this code is needed. I have guesses, but in order to be sure, I'd have to check several reference manuals. With my suggestion, it is obvious to everyone why this code is here, and it gives a hint to those who are adding support to new chips.
Now, I'm not saying you should use my suggestion precisely. Perhaps every version of the esdhc after some point uses this mechanism. Then you could use that information. And perhaps my naming doesn't reflect what is happening. My point is, you're going to have to do this again when you release LS232XB, and that
seems like a poor use of your time.
:)
Yangbo,
I agree with Andy on this. Please make the suggested change.
... as some sort of Kconfig entry that's ideally selected rather than prmopted for when applicable. Like it would be done in the kernel :)
-- Tom
[Lu Yangbo-B47093] Hi Tom, I want to reconfirm whether your suggestion
is same with Andy and York's.
Could I define it in include/configs/xxxx.h? Or use Kconfig?
I'm agreeing with what Andy/York say and noting that the right way to fix this is not to add something to include/configs/ but to use Kconfig and have the platforms select the symbol (rather than prompt for it), similar to how flags like this would work in the Linux kernel.
-- Tom
[Lu Yangbo-B47093] Thank you. But I just find I need to remove all the #ifdef rather than add one. Because the MMC_CMD_STOP_TRANSMISSION command must be set a XFERTYP_CMDTYP_ABORT command type according to SD spec.
A new version patch would be sent later.
Best regards, Yangbo Lu