Re: [PATCH] drm/i915: Add a policy note for removing workarounds

[Jani Nikula <jani.nikula@intel.com>]

On Fri, 17 Nov 2017, Chris Wilson <chris@chris-wilson.co.uk> wrote:
> Rodrigo gave a persuasive argument for keeping workarounds: that they
> serve as a good guide for the bring up of the next generation. Not only
> do workarounds persist into the early revisions, they show where the
> workarounds were previously added to the code flow and sometimes the old
> workarounds have an explanation that give insight into their wider
> implications.
>
> Based on his suggestion, document the policy that we want to keep the
> workarounds from the current generation to guide the next. Older
> preproduction workarounds we still want to remove to keep the code
> clean.
>
> Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
> Cc: Jani Nikula <jani.nikula@intel.com>
> Cc: Rodrigo Vivi <rodrigo.vivi@intel.com>
> Cc: Daniel Vetter <daniel.vetter@ffwll.ch>

Acked-by: Jani Nikula <jani.nikula@intel.com>

> ---
>  drivers/gpu/drm/i915/i915_drv.c | 5 +++++
>  1 file changed, 5 insertions(+)
>
> diff --git a/drivers/gpu/drm/i915/i915_drv.c b/drivers/gpu/drm/i915/i915_drv.c
> index 57dfaf04d819..fbfa9434c1d1 100644
> --- a/drivers/gpu/drm/i915/i915_drv.c
> +++ b/drivers/gpu/drm/i915/i915_drv.c
> @@ -833,6 +833,11 @@ static void i915_workqueues_cleanup(struct drm_i915_private *dev_priv)
>   * We don't keep the workarounds for pre-production hardware, so we expect our
>   * driver to fail on these machines in one way or another. A little warning on
>   * dmesg may help both the user and the bug triagers.
> + *
> + * Our policy for removing pre-production workarounds is to keep the
> + * current gen workarounds as a guide to the bring-up of the next gen
> + * (workarounds have a habit of persisting!). Anything older than that
> + * should be removed along with the complications they introduce.
>   */
>  static void intel_detect_preproduction_hw(struct drm_i915_private *dev_priv)
>  {

-- 
Jani Nikula, Intel Open Source Technology Center
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