From: Kalle Valo Date: Thu, 27 Jul 2023 13:04:28 +0300 Subject: [PATCH] bus: mhi: host: allow MHI client drivers to provide the firmware via a pointer Currently MHI loads the firmware image from the path provided by client devices. ath11k needs to support firmware image embedded along with meta data (named as firmware-2.bin). So allow the client driver to request the firmware file from user space on it's own and provide the firmware image data and size to MHI via a pointer struct mhi_controller::fw_data. This is an optional feature, if fw_data is NULL MHI load the firmware using the name from struct mhi_controller::fw_image string as before. Tested with ath11k and WCN6855 hw2.0. Signed-off-by: Kalle Valo Reviewed-by: Manivannan Sadhasivam Reviewed-by: Jeffrey Hugo Link: https://lore.kernel.org/r/20230727100430.3603551-2-kvalo@kernel.org [mani: wrapped commit message to 75 columns] Signed-off-by: Manivannan Sadhasivam --- --- a/drivers/bus/mhi/host/boot.c +++ b/drivers/bus/mhi/host/boot.c @@ -367,12 +367,10 @@ error_alloc_mhi_buf: } static void mhi_firmware_copy(struct mhi_controller *mhi_cntrl, - const struct firmware *firmware, + const u8 *buf, size_t remainder, struct image_info *img_info) { - size_t remainder = firmware->size; size_t to_cpy; - const u8 *buf = firmware->data; struct mhi_buf *mhi_buf = img_info->mhi_buf; struct bhi_vec_entry *bhi_vec = img_info->bhi_vec; @@ -395,9 +393,10 @@ void mhi_fw_load_handler(struct mhi_cont struct device *dev = &mhi_cntrl->mhi_dev->dev; enum mhi_pm_state new_state; const char *fw_name; + const u8 *fw_data; void *buf; dma_addr_t dma_addr; - size_t size; + size_t size, fw_sz; int i, ret; if (MHI_PM_IN_ERROR_STATE(mhi_cntrl->pm_state)) { @@ -427,6 +426,20 @@ void mhi_fw_load_handler(struct mhi_cont fw_name = (mhi_cntrl->ee == MHI_EE_EDL) ? mhi_cntrl->edl_image : mhi_cntrl->fw_image; + /* check if the driver has already provided the firmware data */ + if (!fw_name && mhi_cntrl->fbc_download && + mhi_cntrl->fw_data && mhi_cntrl->fw_sz) { + if (!mhi_cntrl->sbl_size) { + dev_err(dev, "fw_data provided but no sbl_size\n"); + goto error_fw_load; + } + + size = mhi_cntrl->sbl_size; + fw_data = mhi_cntrl->fw_data; + fw_sz = mhi_cntrl->fw_sz; + goto skip_req_fw; + } + if (!fw_name || (mhi_cntrl->fbc_download && (!mhi_cntrl->sbl_size || !mhi_cntrl->seg_len))) { dev_err(dev, @@ -446,6 +459,10 @@ void mhi_fw_load_handler(struct mhi_cont if (size > firmware->size) size = firmware->size; + fw_data = firmware->data; + fw_sz = firmware->size; + +skip_req_fw: buf = dma_alloc_coherent(mhi_cntrl->cntrl_dev, size, &dma_addr, GFP_KERNEL); if (!buf) { @@ -454,7 +471,7 @@ void mhi_fw_load_handler(struct mhi_cont } /* Download image using BHI */ - memcpy(buf, firmware->data, size); + memcpy(buf, fw_data, size); ret = mhi_fw_load_bhi(mhi_cntrl, dma_addr, size); dma_free_coherent(mhi_cntrl->cntrl_dev, size, buf, dma_addr); @@ -466,7 +483,7 @@ void mhi_fw_load_handler(struct mhi_cont } /* Wait for ready since EDL image was loaded */ - if (fw_name == mhi_cntrl->edl_image) { + if (fw_name && fw_name == mhi_cntrl->edl_image) { release_firmware(firmware); goto fw_load_ready_state; } @@ -480,15 +497,14 @@ void mhi_fw_load_handler(struct mhi_cont * device transitioning into MHI READY state */ if (mhi_cntrl->fbc_download) { - ret = mhi_alloc_bhie_table(mhi_cntrl, &mhi_cntrl->fbc_image, - firmware->size); + ret = mhi_alloc_bhie_table(mhi_cntrl, &mhi_cntrl->fbc_image, fw_sz); if (ret) { release_firmware(firmware); goto error_fw_load; } /* Load the firmware into BHIE vec table */ - mhi_firmware_copy(mhi_cntrl, firmware, mhi_cntrl->fbc_image); + mhi_firmware_copy(mhi_cntrl, fw_data, fw_sz, mhi_cntrl->fbc_image); } release_firmware(firmware); --- a/include/linux/mhi.h +++ b/include/linux/mhi.h @@ -301,6 +301,10 @@ struct mhi_controller_config { * @iova_start: IOMMU starting address for data (required) * @iova_stop: IOMMU stop address for data (required) * @fw_image: Firmware image name for normal booting (optional) + * @fw_data: Firmware image data content for normal booting, used only + * if fw_image is NULL and fbc_download is true (optional) + * @fw_sz: Firmware image data size for normal booting, used only if fw_image + * is NULL and fbc_download is true (optional) * @edl_image: Firmware image name for emergency download mode (optional) * @rddm_size: RAM dump size that host should allocate for debugging purpose * @sbl_size: SBL image size downloaded through BHIe (optional) @@ -387,6 +391,8 @@ struct mhi_controller { dma_addr_t iova_start; dma_addr_t iova_stop; const char *fw_image; + const u8 *fw_data; + size_t fw_sz; const char *edl_image; size_t rddm_size; size_t sbl_size;