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drm_bridge_hpd_enable()/drm_bridge_hpd_disable() callbacks call into the respective driver's hpd_enable()/hpd_disable() ops. These ops control the HPD enable/disable logic which in some cases like MSM can be a dedicate hardware block to control the HPD. During probe_defer cases, a connector can be initialized and then later destroyed till the probe is retried. During connector destroy in these cases, the hpd_disable() callback gets called without a corresponding hpd_enable() leading to an unbalanced state potentially causing even a crash. This can be avoided by the respective drivers maintaining their own state logic to ensure that a hpd_disable() without a corresponding hpd_enable() just returns without doing anything. However, to have a generic fix it would be better to avoid the hpd_disable() callback from the connector destroy path and let the hpd_enable() / hpd_disable() balance be maintained by the corresponding drm_bridge_connector_enable_hpd() / drm_bridge_connector_disable_hpd() APIs which should get called by drm_kms_helper_disable_hpd(). changes in v2: - minor change in commit text (Dmitry) Signed-off-by: Abhinav Kumar <quic_abhinavk@quicinc.com> Reviewed-by: Dmitry Baryshkov <dmitry.baryshkov@linaro.org> Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com> Signed-off-by: Dmitry Baryshkov <dmitry.baryshkov@linaro.org> Link: https://patchwork.freedesktop.org/patch/msgid/20230919174813.26958-1-quic_abhinavk@quicinc.com
Linux kernel
============
There are several guides for kernel developers and users. These guides can
be rendered in a number of formats, like HTML and PDF. Please read
Documentation/admin-guide/README.rst first.
In order to build the documentation, use ``make htmldocs`` or
``make pdfdocs``. The formatted documentation can also be read online at:
https://www.kernel.org/doc/html/latest/
There are various text files in the Documentation/ subdirectory,
several of them using the Restructured Text markup notation.
Please read the Documentation/process/changes.rst file, as it contains the
requirements for building and running the kernel, and information about
the problems which may result by upgrading your kernel.