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Mon, 27 Nov 2023 04:46:02 -0800 (PST) Received: from localhost.localdomain ([117.213.103.241]) by smtp.gmail.com with ESMTPSA id er10-20020a056214190a00b0067a204b4688sm2832231qvb.18.2023.11.27.04.45.58 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 27 Nov 2023 04:46:01 -0800 (PST) From: Manivannan Sadhasivam To: lpieralisi@kernel.org, kw@linux.com Cc: kishon@kernel.org, bhelgaas@google.com, mhi@lists.linux.dev, linux-arm-msm@vger.kernel.org, linux-pci@vger.kernel.org, linux-kernel@vger.kernel.org, Manivannan Sadhasivam Subject: [PATCH 4/9] PCI: epf-mhi: Simulate async read/write using iATU Date: Mon, 27 Nov 2023 18:15:24 +0530 Message-Id: <20231127124529.78203-5-manivannan.sadhasivam@linaro.org> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20231127124529.78203-1-manivannan.sadhasivam@linaro.org> References: <20231127124529.78203-1-manivannan.sadhasivam@linaro.org> Precedence: bulk X-Mailing-List: linux-pci@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Even though iATU only supports synchronous read/write, the MHI stack may call async read/write callbacks without knowing the limitations of the controller driver. So in order to maintain compatibility, let's simulate async read/write operation with iATU by invoking the completion callback after memcpy. Signed-off-by: Manivannan Sadhasivam Reviewed-by: Krzysztof Wilczyński --- drivers/pci/endpoint/functions/pci-epf-mhi.c | 6 ++++++ 1 file changed, 6 insertions(+) diff --git a/drivers/pci/endpoint/functions/pci-epf-mhi.c b/drivers/pci/endpoint/functions/pci-epf-mhi.c index 34e7191f9508..7214f4da733b 100644 --- a/drivers/pci/endpoint/functions/pci-epf-mhi.c +++ b/drivers/pci/endpoint/functions/pci-epf-mhi.c @@ -234,6 +234,9 @@ static int pci_epf_mhi_iatu_read(struct mhi_ep_cntrl *mhi_cntrl, mutex_unlock(&epf_mhi->lock); + if (buf_info->cb) + buf_info->cb(buf_info); + return 0; } @@ -262,6 +265,9 @@ static int pci_epf_mhi_iatu_write(struct mhi_ep_cntrl *mhi_cntrl, mutex_unlock(&epf_mhi->lock); + if (buf_info->cb) + buf_info->cb(buf_info); + return 0; }