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Thu, 27 Jun 2024 16:58:29 -0700 (PDT) Received: from google.com ([2620:15c:9d:2:c929:2998:720d:a104]) by smtp.gmail.com with ESMTPSA id d2e1a72fcca58-708044ae395sm299712b3a.144.2024.06.27.16.58.28 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 27 Jun 2024 16:58:29 -0700 (PDT) Date: Thu, 27 Jun 2024 16:58:26 -0700 From: Dmitry Torokhov To: Daisuke Nojiri Cc: Benson Leung , Tzung-Bi Shih , Guenter Roeck , Rob Herring , Krzysztof Kozlowski , Conor Dooley , Reka Norman , Hans Verkuil , Gwendal Grignou , Pavan Holla , Lukasz Majczak , Ching-Kang Yen , Stephen Boyd , Prashant Malani , chrome-platform@lists.linux.dev, linux-kernel@vger.kernel.org, linux-input@vger.kernel.org, devicetree@vger.kernel.org Subject: Re: [PATCH v5 1/2] cros_ec_proto: Consolidate ec_response_get_next_event Message-ID: References: Precedence: bulk X-Mailing-List: linux-input@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: On Thu, Jun 27, 2024 at 04:53:07PM -0700, Daisuke Nojiri wrote: > Consolidate struct ec_response_get_next_event_v*. > > Let X->Y indicate kernel X sending EC_CMD_GET_NEXT_EVENT to FW Y. > > Old->New: > Existing kernels send a smaller container (e.g. > ec_response_get_next_data) which may or may not fit the last few > bytes. The FW copies as many bytes as possible to the container. The > kernel processes as many leading bytes as it can understand. > > New->Old: > New kernels send a bigger container. Existing FW copies as many bytes > as it wants, leaving the last few bytes empty. The kernel knows it > didn't receive full size data from the returned data length. > > Signed-off-by: Daisuke Nojiri Reviewed-by: Dmitry Torokhov Thanks. -- Dmitry