On Mon, 28 Oct 2024 15:47:25 +0100 Marek Vasut <marex@xxxxxxx> wrote: > On 10/28/24 2:52 PM, Herve Codina wrote: > > Hi Marek, > > Hi, > > >>> On Sat, 26 Oct 2024 00:53:51 +0200 > >>> Marek Vasut <marex@xxxxxxx> wrote: > >>> > >>>> On 10/24/24 11:55 AM, Herve Codina wrote: > >>>>> In some cases observed during ESD tests, the TI SN65DSI83 cannot recover > >>>>> from errors by itself. A full restart of the bridge is needed in those > >>>>> cases to have the bridge output LVDS signals again. > >>>> > >>>> I have seen the bridge being flaky sometimes, do you have any more > >>>> details of what is going on when this irrecoverable error occurs ? > >>> > >>> The panel attached to the bridge goes and stays black. That's the behavior. > >>> A full reset brings the panel back displaying frames. > >> Is there some noticeable change in 0xe0/0xe1/0xe5 registers, esp. 0xe5, > >> do they indicate the error occurred somehow ? > > > > 0xe5 register can signal any DSI errors (depending on when the ESD affects > > the DSI bus) even PLL unlock bit was observed set but we didn't see any > > relationship between the bits set in 0xe5 register and the recoverable or > > unrecoverable behavior. > > > > Also, in some cases, reading the register was not even possible (i2c > > transaction nacked). > Oh, wow, I haven't seen that one before. But this is really useful > information, can you please add it into the commit message for V2 ? Yes, I will add this information in v2. Best regards, Hervé -- Hervé Codina, Bootlin Embedded Linux and Kernel engineering https://bootlin.com
