Re: [PATCH v3 07/15] media: qcom: camss: Capture VFE CSID dependency in a helper function

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On 28/08/2023 20:40, Laurent Pinchart wrote:
On Mon, Aug 28, 2023 at 08:37:44PM +0100, Bryan O'Donoghue wrote:
On 28/08/2023 19:47, Laurent Pinchart wrote:
Hi Bryan,

Thank you for the patch.

On Wed, Aug 23, 2023 at 11:44:36AM +0100, Bryan O'Donoghue wrote:
  From sdm845 onwards we need to ensure the VFE is powered on prior to
switching on the CSID.

Based on the discussions with Konrad in the mail thread, I would record
here the reason for this requirement.

What happens if you unconditionally power up the VFE prior to switching
the CSID on ? Will this break something on platforms older than SDM845 ?

vfe->power_count will bump and you will be fine.

Then maybe that would be a simpler solution than having a
device-specific power sequence ?


A fair point.

Worth a try.

---
bod



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