[U-Boot] [PATCH v0] davinci, mmc: Added a delay reading ext CSD register

[U-Boot] [PATCH v0] davinci, mmc: Added a delay reading ext CSD register

[Davide Bonfanti]

Without this additional delay, some eMMC don't negotiate properly bus width
Tested on:
 - Toshiba THGBM2G8D8FBAIB
 - Toshiba THGBM4G4D1HBAR
 - Micron MTFC4GMVEA (the one giving the problem)
 - Hynix H26M64002BNR
 - SanDisk SDIN5E1-32G

Signed-off-by: Davide Bonfanti <davide.bonfanti@bticino.it>
---
 drivers/mmc/davinci_mmc.c |    5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/drivers/mmc/davinci_mmc.c b/drivers/mmc/davinci_mmc.c
index ee8f261..d5a38a7 100644
--- a/drivers/mmc/davinci_mmc.c
+++ b/drivers/mmc/davinci_mmc.c
@@ -285,8 +285,11 @@ dmmc_send_cmd(struct mmc *mmc, struct mmc_cmd *cmd, struct mmc_data *data)
     */
    if (bytes_left > fifo_bytes)
     dmmc_wait_fifo_status(regs, 0x4a);
-   else if (bytes_left == fifo_bytes)
+   else if (bytes_left == fifo_bytes) {
     dmmc_wait_fifo_status(regs, 0x40);
+    if (cmd->cmdidx == MMC_CMD_SEND_EXT_CSD)
+     udelay(600);
+   }
 
    for (i = 0; bytes_left && (i < fifo_words); i++) {
     cmddata = get_val(&regs->mmcdrr);
-- 
1.7.9.5



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[U-Boot] [PATCH v0] davinci, mmc: Added a delay reading ext CSD register

[Tom Rini]

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On 11/29/12 06:06, Davide Bonfanti wrote:
> Without this additional delay, some eMMC don't negotiate properly
> bus width Tested on: - Toshiba THGBM2G8D8FBAIB - Toshiba
> THGBM4G4D1HBAR - Micron MTFC4GMVEA (the one giving the problem) -
> Hynix H26M64002BNR - SanDisk SDIN5E1-32G
> 
> Signed-off-by: Davide Bonfanti <davide.bonfanti@bticino.it>

Acked-by: Tom Rini <trini@ti.com>

Andy, please take this for your MMC tree, thanks!

- -- 
Tom
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[U-Boot] [PATCH v0] davinci, mmc: Added a delay reading ext CSD register

[Andy Fleming]

On Thu, Nov 29, 2012 at 5:06 AM, Davide Bonfanti <davide.bonfanti@bticino.it
> wrote:

> Without this additional delay, some eMMC don't negotiate properly bus width
> Tested on:
>  - Toshiba THGBM2G8D8FBAIB
>  - Toshiba THGBM4G4D1HBAR
>  - Micron MTFC4GMVEA (the one giving the problem)
>  - Hynix H26M64002BNR
>  - SanDisk SDIN5E1-32G
>
> Signed-off-by: Davide Bonfanti <davide.bonfanti@bticino.it>
> ---
>  drivers/mmc/davinci_mmc.c |    5 ++++-
>  1 file changed, 4 insertions(+), 1 deletion(-)
>


In the future, please make sure your patches haven't been mangled. The tabs
are broken, and git was at a loss as to how to resolve the "merge
conflicts" from that. I have applied it by hand.




>
>
>
> Ce message, ainsi que tous les fichiers joints ? ce message,
> peuvent contenir des informations sensibles et/ ou confidentielles
> ne devant pas ?tre divulgu?es. Si vous n'?tes pas le destinataire
> de ce message (ou que vous recevez ce message par erreur), nous
> vous remercions de le notifier imm?diatement ? son exp?diteur, et
> de d?truire ce message. Toute copie, divulgation, modification,
> utilisation ou diffusion, non autoris?e, directe ou indirecte, de
> tout ou partie de ce message, est strictement interdite.
>
> This e-mail, and any document attached hereby, may contain
> confidential and/or privileged information. If you are not the
> intended recipient (or have received this e-mail in error) please
> notify the sender immediately and destroy this e-mail. Any
> unauthorized, direct or indirect, copying, disclosure, distribution
> or other use of the material or parts thereof is strictly
> forbidden.
>
>
Also, note that I have chosen to ignore this warning, but really wish you
wouldn't put me in an awkward legal position by declaring that copying your
open-source code is forbidden. In French, even.