Arindam Nath
03ea364c8e
There is a hard hang observed during resume from S3 when the system receives a DP short pulse interrupt. This is because there are two code paths contending for GPIO access for AUX channel transactions. One such path is through amdgpu_dm_display_resume() function which is invoked from the regular system resume code path. The other path is through handle_hpd_rx_irq(), which is invoked in response to system receiving DP short pulse interrupt. handle_hpd_rx_irq() guards against conflicting GPIO access using hpd_lock, but the GPIO access from amdgpu_dm_display_resume() remains unguarded. This patch makes sure we use hpd_lock inside amdgpu_dm_display_resume() to avoid race conditions for GPIO access. Signed-off-by: Arindam Nath <arindam.nath@amd.com> Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
Linux kernel ============ This file was moved to Documentation/admin-guide/README.rst Please notice that there are several guides for kernel developers and users. These guides can be rendered in a number of formats, like HTML and PDF. In order to build the documentation, use ``make htmldocs`` or ``make pdfdocs``. There are various text files in the Documentation/ subdirectory, several of them using the Restructured Text markup notation. See Documentation/00-INDEX for a list of what is contained in each file. 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.