On Wed, Sep 11, 2024 at 02:12:12PM +0300, Svyatoslav Ryhel wrote: > ср, 11 вер. 2024 р. о 14:01 Marek Vasut <ma...@denx.de> пише: > > > > On 9/11/24 7:57 AM, Svyatoslav Ryhel wrote: > > > > [...] > > > > >>>> You did mention something regarding I2C/PMIC driver probe timing, but > > >>>> it > > >>>> seems the I2C driver and PMIC drivers probe roughly around the same > > >>>> time > > >>>> in both pass and fail cases ? > > >>> > > >>> Yes, here I agree that they both probe and probe passes, but I assume > > >>> timing of i2c call is critical and there may be some dependency which > > >>> is not ready. > > >> > > >> My guess would be pinmux or clock, maybe the i2c controller is marked as > > >> bootph-* in DT and its pinmux/clock is not? Maybe the i2c on tegra works > > >> by sheer coincidence right now? Can you have a look? > > > > > > Power i2c line (one that hosts PMIC) is configured extremely early in > > > SPL since it is needed for cpu and core voltage setup so even if, as > > > you say, tegra works by sheer coincidence, specifically this i2c line > > > should work non the less, since it has all its pre-requisites (clock > > > and pinmux) configured on early stage. > > > > Is it possible that this configuration is somehow reset or reconfigured > > from DT early on in U-Boot proper ? > > No > > > Do you have serial console output in board_f.c time in U-Boot proper , > > possibly using DEUBG_UART , to check if there might be some prior > > failing I2C transfer at that board_f.c time ? > > Haven't spotted anything weird there. > > > > As I have told, I was not able to determine exact reason why this > > > happens, it should not and yet it does. This is why I have abandoned > > > my attempt to implement same changes you are currently proposing. > > > > If tegra has a problem, it should be fixed on tegra side and not block > > core plumbing. I am not seeing the problem on stm32 or imx systems, so I > > am banking toward tegra-specific issue. > > > > And yet you are pushing tegra breaking stuff. I will insist on > reverting this is it passes. > > > Are you able to debug this ? > > No, I am not able find exact cuse of this behavior.
How do you propose we resolve this then, Svyatoslav? I threw this patch at some TI platforms as well and they're all fine. Are you unable to get some early debuging information out like Marek was asking? Thanks. -- Tom
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