6.6-stable review patch. If anyone has any objections, please let me know.
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From: Alexander Wilhelm alexander.wilhelm@westermo.com
commit f471578e8b1a90623674433a01a8845110bc76ce upstream.
On big endian platform like PowerPC, the MHI bus (which is little endian) does not start properly. The following example shows the error messages by using QCN9274 WLAN device with ath12k driver:
ath12k_pci 0001:01:00.0: BAR 0: assigned [mem 0xc00000000-0xc001fffff 64bit] ath12k_pci 0001:01:00.0: MSI vectors: 1 ath12k_pci 0001:01:00.0: Hardware name: qcn9274 hw2.0 ath12k_pci 0001:01:00.0: failed to set mhi state: POWER_ON(2) ath12k_pci 0001:01:00.0: failed to start mhi: -110 ath12k_pci 0001:01:00.0: failed to power up :-110 ath12k_pci 0001:01:00.0: failed to create soc core: -110 ath12k_pci 0001:01:00.0: failed to init core: -110 ath12k_pci: probe of 0001:01:00.0 failed with error -110
The issue seems to be with the incorrect DMA address/size used for transferring the firmware image over BHI. So fix it by converting the DMA address and size of the BHI vector table to little endian format before sending them to the device.
Fixes: 6cd330ae76ff ("bus: mhi: core: Add support for ringing channel/event ring doorbells") Signed-off-by: Alexander Wilhelm alexander.wilhelm@westermo.com [mani: added stable tag and reworded commit message] Signed-off-by: Manivannan Sadhasivam mani@kernel.org Reviewed-by: Jeff Hugo jeff.hugo@oss.qualcomm.com Reviewed-by: Krishna Chaitanya Chundru krishna.chundru@oss.qualcomm.com Cc: stable@vger.kernel.org Link: https://patch.msgid.link/20250519145837.958153-1-alexander.wilhelm@westermo.... Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org --- drivers/bus/mhi/host/boot.c | 8 ++++---- drivers/bus/mhi/host/internal.h | 4 ++-- 2 files changed, 6 insertions(+), 6 deletions(-)
--- a/drivers/bus/mhi/host/boot.c +++ b/drivers/bus/mhi/host/boot.c @@ -31,8 +31,8 @@ int mhi_rddm_prepare(struct mhi_controll int ret;
for (i = 0; i < img_info->entries - 1; i++, mhi_buf++, bhi_vec++) { - bhi_vec->dma_addr = mhi_buf->dma_addr; - bhi_vec->size = mhi_buf->len; + bhi_vec->dma_addr = cpu_to_le64(mhi_buf->dma_addr); + bhi_vec->size = cpu_to_le64(mhi_buf->len); }
dev_dbg(dev, "BHIe programming for RDDM\n"); @@ -375,8 +375,8 @@ static void mhi_firmware_copy(struct mhi while (remainder) { to_cpy = min(remainder, mhi_buf->len); memcpy(mhi_buf->buf, buf, to_cpy); - bhi_vec->dma_addr = mhi_buf->dma_addr; - bhi_vec->size = to_cpy; + bhi_vec->dma_addr = cpu_to_le64(mhi_buf->dma_addr); + bhi_vec->size = cpu_to_le64(to_cpy);
buf += to_cpy; remainder -= to_cpy; --- a/drivers/bus/mhi/host/internal.h +++ b/drivers/bus/mhi/host/internal.h @@ -31,8 +31,8 @@ struct mhi_ctxt { };
struct bhi_vec_entry { - u64 dma_addr; - u64 size; + __le64 dma_addr; + __le64 size; };
enum mhi_ch_state_type {