[PATCH 4/9] PCI: epf-mhi: Simulate async read/write using iATU

Manivannan Sadhasivam
2023-11-27T12:46:20Z

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 <manivannan.sadhasivam@linaro.org>
---
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;
}

--
2.25.1