diff mbox series

[2/7] bus: mhi: host: Add a policy to enable image transfer via BHIe in PBL

Message ID 20241213213340.2551697-3-quic_jhugo@quicinc.com (mailing list archive)
State New, archived
Headers show
Series accel/qaic: Initial AIC200 support | expand

Commit Message

Jeffrey Hugo Dec. 13, 2024, 9:33 p.m. UTC 
From: Matthew Leung <quic_mattleun@quicinc.com>

Currently, mhi host only performs firmware transfer via BHI in PBL and
BHIe from SBL. To support BHIe transfer directly from PBL, a policy
needs to be added.

With this policy, BHIe will be used to transfer firmware in PBL if the
mhi controller has bhie regs, sets seg_len, and does not set
fbc_download. The intention is to transfer firmware using BHIe in PBL
without further BHIe transfers in SBL.

Signed-off-by: Matthew Leung <quic_mattleun@quicinc.com>
Reviewed-by: Youssef Samir <quic_yabdulra@quicinc.com>
Reviewed-by: Jeffrey Hugo <quic_jhugo@quicinc.com>
Signed-off-by: Jeffrey Hugo <quic_jhugo@quicinc.com>
---
 drivers/bus/mhi/host/boot.c     | 80 +++++++++++++++++++++++++++------
 drivers/bus/mhi/host/init.c     |  2 +-
 drivers/bus/mhi/host/internal.h |  8 ++++
 3 files changed, 75 insertions(+), 15 deletions(-)
diff mbox series

Patch

diff --git a/drivers/bus/mhi/host/boot.c b/drivers/bus/mhi/host/boot.c
index e3f3c07166ad..c9ecb6427209 100644
--- a/drivers/bus/mhi/host/boot.c
+++ b/drivers/bus/mhi/host/boot.c
@@ -452,12 +452,62 @@  static void mhi_firmware_copy_bhie(struct mhi_controller *mhi_cntrl,
 	}
 }
 
+static enum mhi_fw_load_type mhi_fw_load_type_get(const struct mhi_controller *mhi_cntrl)
+{
+	enum mhi_fw_load_type ret = MHI_FW_LOAD_UNKNOWN;
+
+	if (mhi_cntrl->fbc_download) {
+		if (mhi_cntrl->bhie && mhi_cntrl->seg_len)
+			ret = MHI_FW_LOAD_FBC;
+	} else {
+		if (mhi_cntrl->bhie && mhi_cntrl->seg_len)
+			ret = MHI_FW_LOAD_BHIE;
+		else
+			ret = MHI_FW_LOAD_BHI;
+	}
+	return ret;
+}
+
+static int mhi_send_image_bhi(struct mhi_controller *mhi_cntrl, const u8 *fw_data, size_t size)
+{
+	struct image_info *image;
+	int ret;
+
+	ret = mhi_alloc_bhi_buffer(mhi_cntrl, &image, size);
+	if (ret)
+		return ret;
+
+	mhi_firmware_copy_bhi(mhi_cntrl, fw_data, size, image);
+
+	ret = mhi_fw_load_bhi(mhi_cntrl, &image->mhi_buf[image->entries - 1]);
+	mhi_free_bhi_buffer(mhi_cntrl, image);
+
+	return ret;
+}
+
+static int mhi_send_image_bhie(struct mhi_controller *mhi_cntrl, const u8 *fw_data, size_t size)
+{
+	struct image_info *image;
+	int ret;
+
+	ret = mhi_alloc_bhie_table(mhi_cntrl, &image, size);
+	if (ret)
+		return ret;
+
+	mhi_firmware_copy_bhie(mhi_cntrl, fw_data, size, image);
+
+	ret = mhi_fw_load_bhie(mhi_cntrl, &image->mhi_buf[image->entries - 1]);
+	mhi_free_bhie_table(mhi_cntrl, image);
+
+	return ret;
+}
+
 void mhi_fw_load_handler(struct mhi_controller *mhi_cntrl)
 {
 	const struct firmware *firmware = NULL;
 	struct device *dev = &mhi_cntrl->mhi_dev->dev;
+	enum mhi_fw_load_type fw_load_type;
 	enum mhi_pm_state new_state;
-	struct image_info *image;
 	const char *fw_name;
 	const u8 *fw_data;
 	size_t size, fw_sz;
@@ -481,6 +531,12 @@  void mhi_fw_load_handler(struct mhi_controller *mhi_cntrl)
 	fw_name = (mhi_cntrl->ee == MHI_EE_EDL) ?
 		mhi_cntrl->edl_image : mhi_cntrl->fw_image;
 
+	fw_load_type = mhi_fw_load_type_get(mhi_cntrl);
+	if (fw_load_type == MHI_FW_LOAD_UNKNOWN) {
+		dev_err(dev, "Cannot load FW as load type is UNKNOWN\n");
+		return;
+	}
+
 	/* 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) {
@@ -518,20 +574,16 @@  void mhi_fw_load_handler(struct mhi_controller *mhi_cntrl)
 	fw_sz = firmware->size;
 
 skip_req_fw:
-	ret = mhi_alloc_bhi_buffer(mhi_cntrl, &image, size);
-	if (ret) {
-		release_firmware(firmware);
-		goto error_fw_load;
-	}
-	mhi_firmware_copy_bhi(mhi_cntrl, fw_data, size, image);
-
-	/* Download image using BHI */
-	ret = mhi_fw_load_bhi(mhi_cntrl, image->mhi_buf);
-	mhi_free_bhi_buffer(mhi_cntrl, image);
+	if (fw_load_type == MHI_FW_LOAD_BHIE)
+		ret = mhi_send_image_bhie(mhi_cntrl, fw_data, size);
+	else
+		ret = mhi_send_image_bhi(mhi_cntrl, fw_data, size);
 
 	/* Error or in EDL mode, we're done */
 	if (ret) {
-		dev_err(dev, "MHI did not load image over BHI, ret: %d\n", ret);
+		dev_err(dev, "MHI did not load image over BHI%s, ret: %d\n",
+			fw_load_type == MHI_FW_LOAD_BHIE ? "e" : "",
+			ret);
 		release_firmware(firmware);
 		goto error_fw_load;
 	}
@@ -550,7 +602,7 @@  void mhi_fw_load_handler(struct mhi_controller *mhi_cntrl)
 	 * If we're doing fbc, populate vector tables while
 	 * device transitioning into MHI READY state
 	 */
-	if (mhi_cntrl->fbc_download) {
+	if (fw_load_type == MHI_FW_LOAD_FBC) {
 		ret = mhi_alloc_bhie_table(mhi_cntrl, &mhi_cntrl->fbc_image, fw_sz);
 		if (ret) {
 			release_firmware(firmware);
@@ -575,7 +627,7 @@  void mhi_fw_load_handler(struct mhi_controller *mhi_cntrl)
 	return;
 
 error_ready_state:
-	if (mhi_cntrl->fbc_download) {
+	if (fw_load_type == MHI_FW_LOAD_FBC) {
 		mhi_free_bhie_table(mhi_cntrl, mhi_cntrl->fbc_image);
 		mhi_cntrl->fbc_image = NULL;
 	}
diff --git a/drivers/bus/mhi/host/init.c b/drivers/bus/mhi/host/init.c
index a9b1f8beee7b..13e7a55f54ff 100644
--- a/drivers/bus/mhi/host/init.c
+++ b/drivers/bus/mhi/host/init.c
@@ -1144,7 +1144,7 @@  int mhi_prepare_for_power_up(struct mhi_controller *mhi_cntrl)
 	}
 	mhi_cntrl->bhi = mhi_cntrl->regs + bhi_off;
 
-	if (mhi_cntrl->fbc_download || mhi_cntrl->rddm_size) {
+	if (mhi_cntrl->fbc_download || mhi_cntrl->rddm_size || mhi_cntrl->seg_len) {
 		ret = mhi_read_reg(mhi_cntrl, mhi_cntrl->regs, BHIEOFF,
 				   &bhie_off);
 		if (ret) {
diff --git a/drivers/bus/mhi/host/internal.h b/drivers/bus/mhi/host/internal.h
index 3134f111be35..afcf536083bc 100644
--- a/drivers/bus/mhi/host/internal.h
+++ b/drivers/bus/mhi/host/internal.h
@@ -29,6 +29,14 @@  struct bhi_vec_entry {
 	u64 size;
 };
 
+enum mhi_fw_load_type {
+	MHI_FW_LOAD_UNKNOWN,
+	MHI_FW_LOAD_BHI,	/* BHI only in PBL */
+	MHI_FW_LOAD_BHIE,	/* BHIe only in PBL */
+	MHI_FW_LOAD_FBC,	/* BHI in PBL followed by BHIe in SBL */
+	MHI_FW_LOAD_MAX,
+};
+
 enum mhi_ch_state_type {
 	MHI_CH_STATE_TYPE_RESET,
 	MHI_CH_STATE_TYPE_STOP,