SD/MMC Card Detect Interrupt in Dm365 EVM

Ravindra

All,

We are adding WinCE Support for the Dm365 EVM. While adding the SD/MMC Driver, we see that the Card detect interrupt does not fire inspite of the correct CPLD configuration.

We are referring to the Register 7 in the CPLD Registers [Media Status Reg] at EMIF CE1. As anybody faced the same issue with the Card detect interrupt not firing?

Thanks,

Ravi

over 15 years ago

0 Miguel A. Alanis over 15 years ago

TI__Genius 9490 points

Ravi,

I am not sure if our linux side drivers have seen/faced this. From the hardware perspective I have not heard of any reported issues on this MMC/SD interrupts.

regards,

miguel

0 Ravindra over 15 years ago in reply to Miguel A. Alanis

Intellectual 870 points

Miguel,

Thanks for the response. I am going through the LInux Driver currently. But just to confirm that this is not the case, is the Linux Driver employing a software based polling method to read the current status of the Media Status Register from the CPLD?

Regards,

Ravi

0 Anshuman Saxena over 15 years ago in reply to Ravindra

TI__Mastermind 19985 points

Ravi,

I dont think the current linux driver for MMC/SD on DM365 LSP 2.10.xx has support for card detection interrupt. I am not sure about LSP 3.xx open source software. I will ask this question with our internal linux drivers team.

Regards,

Anshuman

0 Anshuman Saxena over 15 years ago in reply to Anshuman Saxena

TI__Mastermind 19985 points

Hi Ravi,

I confirmed with the drivers team that we do not have interrupt based card detection in LSP 2.10 and even in open source LSP 3.x. We do a fixed interval polling to detect the card. It is done by sending commands to SD interface and wait for response. You can refer to the source code in drivers/mmc/host/davinci-mmc.c

Regards,

Anshuman

PS: If this post answers your questions, please mark it verified.

0 Ravindra over 15 years ago in reply to Anshuman Saxena

Intellectual 870 points

Anshuman,

Thanks for the response. This helps us for now.

Regards,

Ravi

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SD/MMC Card Detect Interrupt in Dm365 EVM