linux-kernel - drm/etnaviv: Add support for running a PPU flop reset

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Message-ID: <20250618204400.21808-1-gert.wollny@collabora.com>
Date: Wed, 18 Jun 2025 22:43:28 +0200
From: Gert Wollny <gert.wollny@...labora.com>
To: Lucas Stach <l.stach@...gutronix.de>,
	Russell King <linux+etnaviv@...linux.org.uk>,
	Christian Gmeiner <christian.gmeiner@...il.com>
Cc: etnaviv@...ts.freedesktop.org,
	dri-devel@...ts.freedesktop.org,
	linux-kernel@...r.kernel.org
Subject: drm/etnaviv: Add support for running a PPU flop reset

Dear all, 

this is the second version of the patches to add a PPU flop reset to 
drm/etnaviv. The first version of the series was send as an RFC to
etnaviv@...ts.freedesktop.org only.  

This series adds running the PPU flop reset which is required for some
hardware. This implementation was tested with the STM vendor kernel based on
linux-6.6.48 that is provided with
  https://github.com/STMicroelectronics/oe-manifest/
  Release: openstlinux-6.6-yocto-scarthgap-mpu-v25.04.30

The command stream is based on the stream that is emitted in the acccording
code of the galcore kernel. Since I have only a stm32mp257f-ev1 board t
test this for all parts that are emitted conditionally in the galcore kernel
only the part that is required for this board is submitted here.

Changes since v1 (RFC): 
 - clean up some code according to comments by Lucas,
 - move the ppu flop reset data into drm_private as suggested by Lucas
-  initialize flop reset data only once if any GPU needs it,
   For this is was also required to move the identification 
   of the hardware to etnaviv_gpu_bind,
 - move VIVS_ definitions out of etnaviv_flop_reset.c,
 - add a module parameter that makes it possible to force running the 
   PPU flop reset. 

Thanks for any comments,
Gert