Patchwork [U-Boot] mmc: mx6qsabrelite: fsl_esdhc: Define maximum bus width supported by SabreLite board

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Submitter Abbas Raza
Date March 21, 2013, 11 a.m.
Message ID <1363863628-31707-1-git-send-email-abbas_raza@mentor.com>
Download mbox | patch
Permalink /patch/229623/
State Not Applicable
Delegated to: Stefano Babic
Headers show

Comments

Abbas Raza - March 21, 2013, 11 a.m.
From: Abbas Raza <Abbas_Raza@mentor.com>

Maximum bus width supported by SabreLite board is not 8bit like
all other mx6q specific boards. In case where both host controller
and card support 8bit transfers, they agree to communicate on 8bit
interface while boards like the SabreLite support only 4bit interface.
Due to this reason the mmc 8bit default mode fails on the SabreLite.
To rectify this, define maximum bus width supported by this board (4bit).
If max_bus_width is not defined, it is 0 by default and 8bit width support
will be enabled in host capabilities otherwise host capabilities are modified
accordingly.

It is tested with a MMCplus card.

Signed-off-by: Abbas Raza <Abbas_Raza@mentor.com>
cc: stefano Babic <sbabic@denx.de>
cc: Andy Fleming <afleming@gmail.com>
Acked-by: Dirk Behme <dirk.behme@de.bosch.com>
Acked-by: Andrew Gabbasov <andrew_gabbasov@mentor.com>
---
 board/freescale/mx6qsabrelite/mx6qsabrelite.c | 3 +++
 drivers/mmc/fsl_esdhc.c                       | 7 +++++++
 include/fsl_esdhc.h                           | 1 +
 3 files changed, 11 insertions(+)
Stefano Babic - April 3, 2013, 9:06 a.m.
On 21/03/2013 12:00, Abbas Raza wrote:
> From: Abbas Raza <Abbas_Raza@mentor.com>
> 
> Maximum bus width supported by SabreLite board is not 8bit like
> all other mx6q specific boards. In case where both host controller
> and card support 8bit transfers, they agree to communicate on 8bit
> interface while boards like the SabreLite support only 4bit interface.
> Due to this reason the mmc 8bit default mode fails on the SabreLite.
> To rectify this, define maximum bus width supported by this board (4bit).
> If max_bus_width is not defined, it is 0 by default and 8bit width support
> will be enabled in host capabilities otherwise host capabilities are modified
> accordingly.
> 
> It is tested with a MMCplus card.
> 
> Signed-off-by: Abbas Raza <Abbas_Raza@mentor.com>
> cc: stefano Babic <sbabic@denx.de>
> cc: Andy Fleming <afleming@gmail.com>
> Acked-by: Dirk Behme <dirk.behme@de.bosch.com>
> Acked-by: Andrew Gabbasov <andrew_gabbasov@mentor.com>
> ---

Applied to u-boot-imx, thanks.

FYI: of course, I will merge the same fix for max_bus_width for
Nitrogen6x and Wandboard if posted.

Best regards,
Stefano Babic
Dirk Behme - April 3, 2013, 9:18 a.m.
On 03.04.2013 11:06, Stefano Babic wrote:
> On 21/03/2013 12:00, Abbas Raza wrote:
>> From: Abbas Raza <Abbas_Raza@mentor.com>
>>
>> Maximum bus width supported by SabreLite board is not 8bit like
>> all other mx6q specific boards. In case where both host controller
>> and card support 8bit transfers, they agree to communicate on 8bit
>> interface while boards like the SabreLite support only 4bit interface.
>> Due to this reason the mmc 8bit default mode fails on the SabreLite.
>> To rectify this, define maximum bus width supported by this board (4bit).
>> If max_bus_width is not defined, it is 0 by default and 8bit width support
>> will be enabled in host capabilities otherwise host capabilities are modified
>> accordingly.
>>
>> It is tested with a MMCplus card.
>>
>> Signed-off-by: Abbas Raza <Abbas_Raza@mentor.com>
>> cc: stefano Babic <sbabic@denx.de>
>> cc: Andy Fleming <afleming@gmail.com>
>> Acked-by: Dirk Behme <dirk.behme@de.bosch.com>
>> Acked-by: Andrew Gabbasov <andrew_gabbasov@mentor.com>
>> ---
> 
> Applied to u-boot-imx, thanks.
> 
> FYI: of course, I will merge the same fix for max_bus_width for
> Nitrogen6x and Wandboard if posted.

Have you noticed v2 of this patch

http://lists.denx.de/pipermail/u-boot/2013-March/150119.html

?

Best regards

Dirk
Stefano Babic - April 3, 2013, 9:27 a.m.
On 03/04/2013 11:06, Stefano Babic wrote:
> On 21/03/2013 12:00, Abbas Raza wrote:
>> From: Abbas Raza <Abbas_Raza@mentor.com>
>>
>> Maximum bus width supported by SabreLite board is not 8bit like
>> all other mx6q specific boards. In case where both host controller
>> and card support 8bit transfers, they agree to communicate on 8bit
>> interface while boards like the SabreLite support only 4bit interface.
>> Due to this reason the mmc 8bit default mode fails on the SabreLite.
>> To rectify this, define maximum bus width supported by this board (4bit).
>> If max_bus_width is not defined, it is 0 by default and 8bit width support
>> will be enabled in host capabilities otherwise host capabilities are modified
>> accordingly.
>>
>> It is tested with a MMCplus card.
>>
>> Signed-off-by: Abbas Raza <Abbas_Raza@mentor.com>
>> cc: stefano Babic <sbabic@denx.de>
>> cc: Andy Fleming <afleming@gmail.com>
>> Acked-by: Dirk Behme <dirk.behme@de.bosch.com>
>> Acked-by: Andrew Gabbasov <andrew_gabbasov@mentor.com>
>> ---
> 
> Applied to u-boot-imx, thanks.
> 
> FYI: of course, I will merge the same fix for max_bus_width for
> Nitrogen6x and Wandboard if posted.
> 

Sorry for noise - I have missed V2. I will apply V2, not V1, fixing all
boards.

Best regards,
Stefano Babic
Stefano Babic - April 3, 2013, 9:52 a.m.
On 03/04/2013 11:18, Dirk Behme wrote:
> On 03.04.2013 11:06, Stefano Babic wrote:
>> On 21/03/2013 12:00, Abbas Raza wrote:
>>> From: Abbas Raza <Abbas_Raza@mentor.com>
>>>
>>> Maximum bus width supported by SabreLite board is not 8bit like
>>> all other mx6q specific boards. In case where both host controller
>>> and card support 8bit transfers, they agree to communicate on 8bit
>>> interface while boards like the SabreLite support only 4bit interface.
>>> Due to this reason the mmc 8bit default mode fails on the SabreLite.
>>> To rectify this, define maximum bus width supported by this board
>>> (4bit).
>>> If max_bus_width is not defined, it is 0 by default and 8bit width
>>> support
>>> will be enabled in host capabilities otherwise host capabilities are
>>> modified
>>> accordingly.
>>>
>>> It is tested with a MMCplus card.
>>>
>>> Signed-off-by: Abbas Raza <Abbas_Raza@mentor.com>
>>> cc: stefano Babic <sbabic@denx.de>
>>> cc: Andy Fleming <afleming@gmail.com>
>>> Acked-by: Dirk Behme <dirk.behme@de.bosch.com>
>>> Acked-by: Andrew Gabbasov <andrew_gabbasov@mentor.com>
>>> ---
>>
>> Applied to u-boot-imx, thanks.
>>
>> FYI: of course, I will merge the same fix for max_bus_width for
>> Nitrogen6x and Wandboard if posted.
> 
> Have you noticed v2 of this patch
> 
> http://lists.denx.de/pipermail/u-boot/2013-March/150119.html

Right, I noted after sending the e-mail ;-)

Regards,
Stefano

Patch

diff --git a/board/freescale/mx6qsabrelite/mx6qsabrelite.c b/board/freescale/mx6qsabrelite/mx6qsabrelite.c
index d563464..14c299b 100644
--- a/board/freescale/mx6qsabrelite/mx6qsabrelite.c
+++ b/board/freescale/mx6qsabrelite/mx6qsabrelite.c
@@ -110,6 +110,9 @@  int board_mmc_init(bd_t *bis)
 	usdhc_cfg[0].sdhc_clk = mxc_get_clock(MXC_ESDHC3_CLK);
 	usdhc_cfg[1].sdhc_clk = mxc_get_clock(MXC_ESDHC4_CLK);
 
+	usdhc_cfg[0].max_bus_width = 4;
+	usdhc_cfg[1].max_bus_width = 4;
+
 	for (index = 0; index < CONFIG_SYS_FSL_USDHC_NUM; ++index)
 		status |= fsl_esdhc_initialize(bis, &usdhc_cfg[index]);
 
diff --git a/drivers/mmc/fsl_esdhc.c b/drivers/mmc/fsl_esdhc.c
index 3d5c9c0..d2a505e 100644
--- a/drivers/mmc/fsl_esdhc.c
+++ b/drivers/mmc/fsl_esdhc.c
@@ -579,6 +579,13 @@  int fsl_esdhc_initialize(bd_t *bis, struct fsl_esdhc_cfg *cfg)
 
 	mmc->host_caps = MMC_MODE_4BIT | MMC_MODE_8BIT | MMC_MODE_HC;
 
+	if (cfg->max_bus_width > 0) {
+		if (cfg->max_bus_width < 8)
+			mmc->host_caps &= ~MMC_MODE_8BIT;
+		if (cfg->max_bus_width < 4)
+			mmc->host_caps &= ~MMC_MODE_4BIT;
+	}
+
 	if (caps & ESDHC_HOSTCAPBLT_HSS)
 		mmc->host_caps |= MMC_MODE_HS_52MHz | MMC_MODE_HS;
 
diff --git a/include/fsl_esdhc.h b/include/fsl_esdhc.h
index 47d2fe4..0a1a071 100644
--- a/include/fsl_esdhc.h
+++ b/include/fsl_esdhc.h
@@ -168,6 +168,7 @@ 
 struct fsl_esdhc_cfg {
 	u32	esdhc_base;
 	u32	sdhc_clk;
+	u8	max_bus_width;
 };
 
 /* Select the correct accessors depending on endianess */