Hi Tushar, On Tue, Apr 9, 2013 at 3:23 PM, Jaehoon Chung <jh80.ch...@samsung.com> wrote: > On 04/09/2013 06:41 PM, Jagan Teki wrote: >> Hi Tushar, >> >> On Mon, Apr 8, 2013 at 9:22 AM, Tushar Behera <tushar.beh...@linaro.org> >> wrote: >>> On 04/07/2013 10:27 AM, Jagan Teki wrote: >>>> Hi, >>>> >>>> I saw that you have been added the SDHCI_QUIRK_WAIT_SEND_CMD on below >>>> commit >>>> http://git.denx.de/?p=u-boot.git;a=commitdiff;h=13243f2eafc4292917178051fe1bb5aab2774dca >>>> >>>> I need few quires regarding the QUIRK delay. >>>> 1. Why the delay is 1000 >>>> + if (host->quirks & SDHCI_QUIRK_WAIT_SEND_CMD) >>>> + udelay(1000); >>>> + >>>> 2. is this delay specific to s5p_sdhci controller? >>> >> >> BTW: >> Can you please help me out what is the reason for max and min clocks >> are at 52000000 and 400000 respectively. >> >> As per my knowledge the max clock of sdhci on spec-2 is 50000000 >> (50Mhz), I may be in correct. > Right..But eMMC can use up to 52MHz. > And see into the drivers/mmc/mmc.c..SD-card's max_dtr is set to 50MHz, if > card is supported HS_MODE.
Ok, Thanks for your information. means the max_clk 52MHz will handle eMMC as well.. is it? What is this min_clk as 400000? Any idea if the max_clk and min_clk value are initialized to 0 so-that sdhci will re-init based on the capabilities register Base_Clock_Frequency_for_SD_Clock[13:8].? Thanks, Jagan. >> >> Request for your help. >> >> Thanks, >> Jagan. >> >>> This was specific to s5p_sdhci driver so as to replicate the behavior of >>> s5p_mmc driver. >>> >>>> 3. I have an issue "Controller never released inhibit bit(s)" >>>> but when I enable this quirk on my driver with udelay(10000), it's >>>> working. >>> >>> I am not sure about the exact delay as per the spec. I have added >>> Jaehoon to CC who might have additional information about this. >>> >>>> >>>> Could you please help me. >>>> >>>> Thanks, >>>> Jagan. >>>> >>> >>> >>> -- >>> Tushar Behera >> > _______________________________________________ U-Boot mailing list U-Boot@lists.denx.de http://lists.denx.de/mailman/listinfo/u-boot
