linux-kernel - Re: [PATCH v2] bus: mhi: host: pci_generic: Use unique 'mhi_pci_dev

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Date: Mon, 1 Jul 2024 21:49:51 +0530
From: Manivannan Sadhasivam <manivannan.sadhasivam@...aro.org>
To: Slark Xiao <slark_xiao@....com>
Cc: mhi@...ts.linux.dev, linux-arm-msm@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2] bus: mhi: host: pci_generic: Use unique
 'mhi_pci_dev_info' for product families

On Wed, Jun 26, 2024 at 08:16:28PM +0800, Slark Xiao wrote:
> 
> At 2024-06-26 13:32:37, "Manivannan Sadhasivam" <manivannan.sadhasivam@...aro.org> wrote:
> >Currently, a single 'mhi_pci_dev_info' is shared across different product
> >families. Even though it makes the device functional, it misleads the users
> >by sharing the common product name.
> >
> >For instance, below message will be printed for Foxconn SDX62 modem during
> >boot:
> >
> >"MHI PCI device found: foxconn-sdx65"
> >
> >But this is quite misleading to the users since the actual modem plugged in
> >could be 'T99W373' which is based on SDX62.
> >
> >So fix this issue by using a unique 'mhi_pci_dev_info' for product
> >families. This allows us to specify a unique product name for each product
> >family. Also, once this name is exposed to client drivers, they may use
> >this name to identify the modems and use any modem specific configuration.
> >
> >Modems of unknown product families are not impacted by this change.
> >
> >CC: Slark Xiao <slark_xiao@....com>
> >Signed-off-by: Manivannan Sadhasivam <manivannan.sadhasivam@...aro.org>
> 
> Reviewed-by: Slark Xiao <slark_xiao@....com>
> 
> >---
> >
> >Changes in v2:
> >
> >* Used 'mhi_foxconn_t99w175_info' for HP variant as well
> >
> > drivers/bus/mhi/host/pci_generic.c | 78 ++++++++++++++++++++++--------
> > 1 file changed, 59 insertions(+), 19 deletions(-)
> >
> >diff --git a/drivers/bus/mhi/host/pci_generic.c b/drivers/bus/mhi/host/pci_generic.c
> >index 08844ee79654..35ae7cd0711f 100644
> >--- a/drivers/bus/mhi/host/pci_generic.c
> >+++ b/drivers/bus/mhi/host/pci_generic.c
> >@@ -419,8 +419,10 @@ static const struct mhi_controller_config modem_foxconn_sdx55_config = {
> > 	.event_cfg = mhi_foxconn_sdx55_events,
> > };
> > 
> >-static const struct mhi_pci_dev_info mhi_foxconn_sdx24_info = {
> >-	.name = "foxconn-sdx24",
> >+static const struct mhi_pci_dev_info mhi_foxconn_sdx55_info = {
> >+	.name = "foxconn-sdx55",
> >+	.fw = "qcom/sdx55m/sbl1.mbn",
> >+	.edl = "qcom/sdx55m/edl.mbn",
> > 	.config = &modem_foxconn_sdx55_config,
> > 	.bar_num = MHI_PCI_DEFAULT_BAR_NUM,
> > 	.dma_data_width = 32,
> >@@ -428,8 +430,8 @@ static const struct mhi_pci_dev_info mhi_foxconn_sdx24_info = {
> > 	.sideband_wake = false,
> > };
> 
> Seems nobody use this mhi_foxconn_sdx55_info.  Please help remove it.
> 

No, it is used by a Qcom modem.

- Mani

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