[PATCH 21/38] mmc: sdhci: hack up driver to make it more compliant with UHS-1
Russell King - ARM Linux
linux at arm.linux.org.uk
Fri Apr 25 06:15:30 PDT 2014
On Fri, Apr 25, 2014 at 03:08:49PM +0200, Markus Pargmann wrote:
> I just tried the different parts of the patch. Without the following
> change, emmc works:
> --- a/drivers/mmc/host/sdhci.c
> +++ b/drivers/mmc/host/sdhci.c
> @@ -1507,12 +1507,6 @@ static void sdhci_do_set_ios(struct sdhci_host *host, struct mmc_ios *ios)
> host->ops->set_clock(host, host->clock);
> - /* Reset SD Clock Enable */
> - clk = sdhci_readw(host, SDHCI_CLOCK_CONTROL);
> - clk &= ~SDHCI_CLOCK_CARD_EN;
> - sdhci_writew(host, clk, SDHCI_CLOCK_CONTROL);
So the bit which stops us violating the SD spec stops eMMC from working...
that's... just great.
Okay, I'll look deeper at this and see what can be done, but I suspect it
will turn out to require more patches and be more invasive.
FTTC broadband for 0.8mile line: now at 9.7Mbps down 460kbps up... slowly
improving, and getting towards what was expected from it.
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