Re: [PATCH v8 08/10] gpu: host1x: mipi: Keep MIPI clock enabled till calibration is done

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On 8/5/20 10:34 AM, Dmitry Osipenko wrote:
05.08.2020 20:29, Sowjanya Komatineni пишет:
...
UART_FST_MIPI_CAL is the clock used for calibration logic which is FSM
that goes thru sequence codes and when done waits for pads to be in
LP-11 to apply results.

MIPI_CLK is controller gate clock which is also need to be kept enabled
as incase if it sees LP-11 it updates registers so its recommended to
have this clock enabled.

We can cancel_calibration() in CSI only when csi/sensor stream on fails
and in which case there will be no LP-11 so we can unconditionally
disable MIPI_CLK.

There is no guarantee that the fail comes before the LP-11. For example,
some odd camera driver may have a complicated enable sequence which may
fail after enabling the hardware streaming.

MIPI_CLK to keep enable is for calibration logic to update results, but like I said calibration logic uses UART_FST_MIPI_CAL clock. So even in case if fail happens from sensor after having pads in LP-11 then, calibration logic will still be running but result update will not happen with clock disabled. But HW will not stuck as this is confirmed from HW designer.







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