From 0092a1e3f7636ff4e202a41b0320690699247e22 Mon Sep 17 00:00:00 2001 From: Loic Poulain Date: Mon, 2 Aug 2021 10:42:46 +0530 Subject: bus: mhi: Add inbound buffers allocation flag Currently, the MHI controller driver defines which channels should have their inbound buffers allocated and queued. But ideally, this is something that should be decided by the MHI device driver instead, which actually deals with that buffers. Add a flag parameter to mhi_prepare_for_transfer allowing to specify if buffers have to be allocated and queued by the MHI stack. Keep auto_queue flag for now, but should be removed at some point. Link: https://lore.kernel.org/r/1624566520-20406-1-git-send-email-loic.poulain@linaro.org Tested-by: Bhaumik Bhatt Reviewed-by: Bhaumik Bhatt Reviewed-by: Hemant Kumar Reviewed-by: Manivannan Sadhasivam Acked-by: Jakub Kicinski Signed-off-by: Loic Poulain Signed-off-by: Manivannan Sadhasivam Link: https://lore.kernel.org/r/20210802051255.5771-2-manivannan.sadhasivam@linaro.org Signed-off-by: Greg Kroah-Hartman --- drivers/bus/mhi/core/internal.h | 2 +- drivers/bus/mhi/core/main.c | 9 ++++++--- 2 files changed, 7 insertions(+), 4 deletions(-) (limited to 'drivers/bus') diff --git a/drivers/bus/mhi/core/internal.h b/drivers/bus/mhi/core/internal.h index 5b9ea66b92dc..bc239a11aa69 100644 --- a/drivers/bus/mhi/core/internal.h +++ b/drivers/bus/mhi/core/internal.h @@ -682,7 +682,7 @@ void mhi_rddm_prepare(struct mhi_controller *mhi_cntrl, struct image_info *img_info); void mhi_fw_load_handler(struct mhi_controller *mhi_cntrl); int mhi_prepare_channel(struct mhi_controller *mhi_cntrl, - struct mhi_chan *mhi_chan); + struct mhi_chan *mhi_chan, unsigned int flags); int mhi_init_chan_ctxt(struct mhi_controller *mhi_cntrl, struct mhi_chan *mhi_chan); void mhi_deinit_chan_ctxt(struct mhi_controller *mhi_cntrl, diff --git a/drivers/bus/mhi/core/main.c b/drivers/bus/mhi/core/main.c index fc9196f11cb7..26bbc812121d 100644 --- a/drivers/bus/mhi/core/main.c +++ b/drivers/bus/mhi/core/main.c @@ -1430,7 +1430,7 @@ exit_unprepare_channel: } int mhi_prepare_channel(struct mhi_controller *mhi_cntrl, - struct mhi_chan *mhi_chan) + struct mhi_chan *mhi_chan, unsigned int flags) { int ret = 0; struct device *dev = &mhi_chan->mhi_dev->dev; @@ -1455,6 +1455,9 @@ int mhi_prepare_channel(struct mhi_controller *mhi_cntrl, if (ret) goto error_pm_state; + if (mhi_chan->dir == DMA_FROM_DEVICE) + mhi_chan->pre_alloc = !!(flags & MHI_CH_INBOUND_ALLOC_BUFS); + /* Pre-allocate buffer for xfer ring */ if (mhi_chan->pre_alloc) { int nr_el = get_nr_avail_ring_elements(mhi_cntrl, @@ -1610,7 +1613,7 @@ void mhi_reset_chan(struct mhi_controller *mhi_cntrl, struct mhi_chan *mhi_chan) } /* Move channel to start state */ -int mhi_prepare_for_transfer(struct mhi_device *mhi_dev) +int mhi_prepare_for_transfer(struct mhi_device *mhi_dev, unsigned int flags) { int ret, dir; struct mhi_controller *mhi_cntrl = mhi_dev->mhi_cntrl; @@ -1621,7 +1624,7 @@ int mhi_prepare_for_transfer(struct mhi_device *mhi_dev) if (!mhi_chan) continue; - ret = mhi_prepare_channel(mhi_cntrl, mhi_chan); + ret = mhi_prepare_channel(mhi_cntrl, mhi_chan, flags); if (ret) goto error_open_chan; } -- cgit v1.2.3