summaryrefslogtreecommitdiff
path: root/drivers/pci
diff options
context:
space:
mode:
authorManivannan Sadhasivam <manivannan.sadhasivam@linaro.org>2023-07-17 09:54:58 +0300
committerKrzysztof Wilczyński <kwilczynski@kernel.org>2023-08-26 19:54:46 +0300
commit127c66c3b95feddda664d1d76cae424a592ceac5 (patch)
tree709f868152e32d6eebb66525343fe5c7a1777aa1 /drivers/pci
parent8ab8a31645b83c6446da6254c099032bab871b23 (diff)
downloadlinux-127c66c3b95feddda664d1d76cae424a592ceac5.tar.xz
PCI: epf-mhi: Use iATU for small transfers
For transfers below 4K, let's use iATU since using eDMA for such small transfers is inefficient. This is mainly because setting up an eDMA transfer and waiting for completion adds some latency. This latency is negligible for large transfers but not for the smaller ones. With using iATU, there is an increase in ~50Mbps throughput on both MHI UL (Uplink) and DL (Downlink) channels. [kwilczynski: commit log] Link: https://lore.kernel.org/linux-pci/20230717065459.14138-7-manivannan.sadhasivam@linaro.org Signed-off-by: Manivannan Sadhasivam <manivannan.sadhasivam@linaro.org> Signed-off-by: Krzysztof Wilczyński <kwilczynski@kernel.org>
Diffstat (limited to 'drivers/pci')
-rw-r--r--drivers/pci/endpoint/functions/pci-epf-mhi.c6
1 files changed, 6 insertions, 0 deletions
diff --git a/drivers/pci/endpoint/functions/pci-epf-mhi.c b/drivers/pci/endpoint/functions/pci-epf-mhi.c
index fec9743a63f0..b7b9d3e21f97 100644
--- a/drivers/pci/endpoint/functions/pci-epf-mhi.c
+++ b/drivers/pci/endpoint/functions/pci-epf-mhi.c
@@ -284,6 +284,9 @@ static int pci_epf_mhi_edma_read(struct mhi_ep_cntrl *mhi_cntrl, u64 from,
dma_addr_t dst_addr;
int ret;
+ if (size < SZ_4K)
+ return pci_epf_mhi_iatu_read(mhi_cntrl, from, to, size);
+
mutex_lock(&epf_mhi->lock);
config.direction = DMA_DEV_TO_MEM;
@@ -350,6 +353,9 @@ static int pci_epf_mhi_edma_write(struct mhi_ep_cntrl *mhi_cntrl, void *from,
dma_addr_t src_addr;
int ret;
+ if (size < SZ_4K)
+ return pci_epf_mhi_iatu_write(mhi_cntrl, from, to, size);
+
mutex_lock(&epf_mhi->lock);
config.direction = DMA_MEM_TO_DEV;