MHI protocol supports downloading RDDM (RAM Dump) image from the device through BHIE. This is useful to debugging as the RDDM image can capture the firmware state. This is based on the patch submitted by Sujeev Dias: https://lkml.org/lkml/2018/7/9/989
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| @@ -283,9 +283,11 @@ struct mhi_controller_config { · 282 unmodified lines | |||
| 283 | * @iova_stop: IOMMU stop address for data (required) | 283 | * @iova_stop: IOMMU stop address for data (required) |
| 284 | * @fw_image: Firmware image name for normal booting (required) | 284 | * @fw_image: Firmware image name for normal booting (required) |
| 285 | * @edl_image: Firmware image name for emergency download mode (optional) | 285 | * @edl_image: Firmware image name for emergency download mode (optional) |
| 286 | * @rddm_size: RAM dump size that host should allocate for debugging purpose | ||
| 286 | * @sbl_size: SBL image size downloaded through BHIe (optional) | 287 | * @sbl_size: SBL image size downloaded through BHIe (optional) |
| 287 | * @seg_len: BHIe vector size (optional) | 288 | * @seg_len: BHIe vector size (optional) |
| 288 | * @fbc_image: Points to firmware image buffer | 289 | * @fbc_image: Points to firmware image buffer |
| 290 | * @rddm_image: Points to RAM dump buffer | ||
| 289 | * @mhi_chan: Points to the channel configuration table | 291 | * @mhi_chan: Points to the channel configuration table |
| 290 | * @lpm_chans: List of channels that require LPM notifications | 292 | * @lpm_chans: List of channels that require LPM notifications |
| 291 | * @irq: base irq # to request (required) | 293 | * @irq: base irq # to request (required) |
| @@ -343,9 +345,11 @@ struct mhi_controller { · 51 unmodified lines | |||
| 343 | dma_addr_t iova_stop; | 345 | dma_addr_t iova_stop; |
| 344 | const char *fw_image; | 346 | const char *fw_image; |
| 345 | const char *edl_image; | 347 | const char *edl_image; |
| 348 | size_t rddm_size; | ||
| 346 | size_t sbl_size; | 349 | size_t sbl_size; |
| 347 | size_t seg_len; | 350 | size_t seg_len; |
| 348 | struct image_info *fbc_image; | 351 | struct image_info *fbc_image; |
| 352 | struct image_info *rddm_image; | ||
| 349 | struct mhi_chan *mhi_chan; | 353 | struct mhi_chan *mhi_chan; |
| 350 | struct list_head lpm_chans; | 354 | struct list_head lpm_chans; |
| 351 | int *irq; | 355 | int *irq; |
| @@ -545,4 +549,24 @@ void mhi_power_down(struct mhi_controller *mhi_cntrl, bool graceful); · 193 unmodified lines | |||
| 545 | */ | 549 | */ |
| 546 | void mhi_unprepare_after_power_down(struct mhi_controller *mhi_cntrl); | 550 | void mhi_unprepare_after_power_down(struct mhi_controller *mhi_cntrl); |
| 547 | 551 | ||
| 552 | /** | ||
| 553 | * mhi_download_rddm_img - Download ramdump image from device for | ||
| 554 | * debugging purpose. | ||
| 555 | * @mhi_cntrl: MHI controller | ||
| 556 | * @in_panic: Download rddm image during kernel panic | ||
| 557 | */ | ||
| 558 | int mhi_download_rddm_img(struct mhi_controller *mhi_cntrl, bool in_panic); | ||
| 559 | |||
| 560 | /** | ||
| 561 | * mhi_force_rddm_mode - Force device into rddm mode | ||
| 562 | * @mhi_cntrl: MHI controller | ||
| 563 | */ | ||
| 564 | int mhi_force_rddm_mode(struct mhi_controller *mhi_cntrl); | ||
| 565 | |||
| 566 | /** | ||
| 567 | * mhi_get_mhi_state - Get MHI state of the device | ||
| 568 | * @mhi_cntrl: MHI controller | ||
| 569 | */ | ||
| 570 | enum mhi_state mhi_get_mhi_state(struct mhi_controller *mhi_cntrl); | ||
| 571 | |||
| 548 | #endif /* _MHI_H_ */ | 572 | #endif /* _MHI_H_ */ |