On Wed, Aug 10, 2011 at 1:59 PM, Marek Vasut <marek.va...@gmail.com> wrote: > On Saturday, July 30, 2011 12:52:53 PM Marek Vasut wrote: >> On Saturday, July 30, 2011 08:42:19 AM Jason Hui wrote: >> > Hi, Marek, >> > >> > On Sat, Jul 30, 2011 at 1:09 AM, Marek Vasut <marek.va...@gmail.com> wrote: >> > > On Friday, July 29, 2011 01:24:49 PM Jason Hui wrote: >> > >> Hi, Marek, >> > >> >> > >> On Fri, Jul 29, 2011 at 5:32 PM, Marek Vasut <marek.va...@gmail.com> > wrote: >> > >> > Rewrite the mxc_i2c driver. >> > >> > >> > >> > * This version is much closer to Linux implementation. >> > >> > * Fixes IPG_PERCLK being incorrectly used as clock source >> > >> > * Fixes behaviour of the driver on iMX51 >> > >> > * Clean up coding style a bit ;-) >> > >> >> > >> I don't think you did the right thing by chaning IPG_PERCLK to IPG_CLK >> > >> As I said, the IPG_CLK is for IP register clock, while IPG_PERCLK is >> > >> for i2c function clock. >> > >> >> > >> if you run clock command from mx51evk, you will get: >> > >> ... >> > >> ipg clock : 66500000Hz >> > >> ipg per clock : 665000000Hz >> > >> MX51EVK U-Boot > >> > >> >> > >> It will give you that ipg per clock is 665M, which seems too big. It >> > >> is due to we configure >> > >> the pre-divider/pos-devider for perclk to zero, which leads to ipg_per >> > >> clock to be same as pll2 clock. >> > >> But I don't think this will have some issue. >> > > >> > > Yes it will, the divider will be computed to be maximum in all cases >> > > ... you won't be able it divide 665MHz by anything from the table 40-7 >> > > in MX51RM to achieve any reasonable frequency. >> > > >> > > On the contrary, 66.5MHz does give fine results. >> > >> > it that, we can change the ipg_perclk to low freq, but we should not >> > change the i2c clock to ipg_clk, this is not correct. >> > >> > >> BTW, I have applied your patch and test on mx53evk board, it seems the >> > >> i2c does not work correctly. >> > > >> > > Great. The clock used by the I2C module for this task are likely the >> > > module_clock, which are -- like on MX51 -- 66.5MHz. What do you get >> > > when you run the "clock" command on MX53EVK ? >> > >> > I'm not in the office for the whole next week, thus, I can't give you >> > the clock output for >> > mx53evk, but I'm sure the ipg_perclk on mx53evk is not set at 66.5Mhz. >> >> Yes, it's 33.3MHz on iMX53. I got a (remote) hand of a MX53 board. The IPG >> clock, on the other hand, are 66.5MHz on both MX51 and MX53. Maybe the >> issue with PMIC you're seeing is something else? >> >> btw. how did you obtain these results ? Can you check the FDR divider value >> with and without this patch?
You can use the clock command to get it. As for the FDR, you want me to check it on i.mx53evk board right? Jason >> >> Thanks > > >> >> > Jason >> > >> > > Thanks >> > > >> > >> After apply your patch: >> > >> MX53EVK U-Boot > pmic dump 30 >> > >> PMIC ID: 0x0000ffff [Rev: unknown] >> > >> >> > >> 0x00: 0001ffff 00ffffff 0039ffff 0000ffff 00ffffff 0000ffff 0000ffff >> > >> 0000ffff 0x08: 0000ffff 0000ffff 0000ffff 0000ffff 0000ffff 0000ffff >> > >> 0000ffff 0040ffff 0x10: 0000ffff 0000ffff 0000ffff 0000ffff 0000ffff >> > >> 0001ffff 0000ffff 0000ffff 0x18: 0045ffff 0045ffff 0000ffff 0080ffff >> > >> 0021ffff 0000ffff 0002ffff 0000ffff 0x20: 0004ffff 0000ffff 0021ffff >> > >> 0000ffff 0000ffff 0000ffff 0000ffff 0000ffff 0x28: 0000ffff 0000ffff >> > >> 0000ffff 0000ffff 0000ffff 0004ffff 0000ffff 00aeffff >> > >> >> > >> The old: >> > >> MX53EVK U-Boot > pmic dump 30 >> > >> PMIC ID: 0x000045d0 [Rev: 2.0] >> > >> >> > >> 0x00: 00015088 00ffffff 00395208 00000081 00fff7ff 0000401c 00000418 >> > >> 000045d0 0x08: 00000000 00000000 00000001 00000000 00000000 00000040 >> > >> 00000000 00400000 0x10: 00000000 00000000 00000000 00000000 00000011 >> > >> 0001ffff 00000000 00007fff 0x18: 00454a52 00456739 0000631a 0080739c >> > >> 0021284a 00000a0a 00024fd0 000001d8 0x20: 00049208 00000000 00218000 >> > >> 00000000 00000000 00000000 00000000 00000000 0x28: 00000000 00000000 >> > >> 00000000 00008000 00000000 00046046 000001c0 00aeeaee >> > >> >> > >> Jason > _______________________________________________ U-Boot mailing list U-Boot@lists.denx.de http://lists.denx.de/mailman/listinfo/u-boot
