[PATCH v4 1/1] bus: mhi: pci_generic: fix Rolling Wireless RW151 MBIM channel ring size

[PATCH v4 1/1] bus: mhi: pci_generic: fix Rolling Wireless RW151 MBIM channel ring size

[zwq2226404116]

From: Wanquan Zhong <wanquan.zhong@fibocom.com>

bus: mhi: pci_generic: fix Rolling Wireless RW151 MBIM channel ring size

Increase RW151 MBIM channel ring size from 4 to 32 to match the device
firmware channel configuration.

Signed-off-by: Wanquan Zhong <wanquan.zhong@fibocom.com>

---
v3 -> v4: Drop no_m3 quirk per review; keep RW151 MBIM ring size fix only
 drivers/bus/mhi/host/pci_generic.c | 2 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/bus/mhi/host/pci_generic.c b/drivers/bus/mhi/host/pci_generic.c
index d598bb3b3981..d686aef6e158 100644
--- a/drivers/bus/mhi/host/pci_generic.c
+++ b/drivers/bus/mhi/host/pci_generic.c
@@ -949,8 +949,8 @@ static const struct mhi_pci_dev_info mhi_rolling_rw135r_info = {
 static const struct mhi_channel_config mhi_rolling_rw151_channels[] = {
 	MHI_CHANNEL_CONFIG_UL(4, "DIAG", 16, 1),
 	MHI_CHANNEL_CONFIG_DL(5, "DIAG", 16, 1),
-	MHI_CHANNEL_CONFIG_UL(12, "MBIM", 4, 0),
-	MHI_CHANNEL_CONFIG_DL(13, "MBIM", 4, 0),
+	MHI_CHANNEL_CONFIG_UL(12, "MBIM", 32, 0),
+	MHI_CHANNEL_CONFIG_DL(13, "MBIM", 32, 0),
 	MHI_CHANNEL_CONFIG_UL(14, "NMEA", 32, 0),
 	MHI_CHANNEL_CONFIG_DL(15, "NMEA", 32, 0),
 	MHI_CHANNEL_CONFIG_UL(32, "DUN", 32, 0),

--
2.50.0

Re: [PATCH v4 1/1] bus: mhi: pci_generic: fix Rolling Wireless RW151 MBIM channel ring size

[Krishna Chaitanya Chundru]

On 7/2/2026 3:30 PM, zwq2226404116@163.com wrote:
> From: Wanquan Zhong <wanquan.zhong@fibocom.com>
>
> bus: mhi: pci_generic: fix Rolling Wireless RW151 MBIM channel ring size
>
> Increase RW151 MBIM channel ring size from 4 to 32 to match the device
> firmware channel configuration.
can you include what is the side affect if we don't have this change, like what is
functional issue, low throughput etc.

- Krishna Chaitanya.
>
> Signed-off-by: Wanquan Zhong <wanquan.zhong@fibocom.com>
>
> ---
> v3 -> v4: Drop no_m3 quirk per review; keep RW151 MBIM ring size fix only
>  drivers/bus/mhi/host/pci_generic.c | 2 ++--
>  1 file changed, 2 insertions(+), 2 deletions(-)
>
> diff --git a/drivers/bus/mhi/host/pci_generic.c b/drivers/bus/mhi/host/pci_generic.c
> index d598bb3b3981..d686aef6e158 100644
> --- a/drivers/bus/mhi/host/pci_generic.c
> +++ b/drivers/bus/mhi/host/pci_generic.c
> @@ -949,8 +949,8 @@ static const struct mhi_pci_dev_info mhi_rolling_rw135r_info = {
>  static const struct mhi_channel_config mhi_rolling_rw151_channels[] = {
>  	MHI_CHANNEL_CONFIG_UL(4, "DIAG", 16, 1),
>  	MHI_CHANNEL_CONFIG_DL(5, "DIAG", 16, 1),
> -	MHI_CHANNEL_CONFIG_UL(12, "MBIM", 4, 0),
> -	MHI_CHANNEL_CONFIG_DL(13, "MBIM", 4, 0),
> +	MHI_CHANNEL_CONFIG_UL(12, "MBIM", 32, 0),
> +	MHI_CHANNEL_CONFIG_DL(13, "MBIM", 32, 0),
>  	MHI_CHANNEL_CONFIG_UL(14, "NMEA", 32, 0),
>  	MHI_CHANNEL_CONFIG_DL(15, "NMEA", 32, 0),
>  	MHI_CHANNEL_CONFIG_UL(32, "DUN", 32, 0),
>
> --
> 2.50.0
>
>