[v1,1/2] bus: mhi: core: Count number of HW channels supported by controller
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Message ID 1603504843-38557-2-git-send-email-hemantk@codeaurora.org
State New, archived
Headers show
Series
  • Check for device supported event rings and channels
Related show

Commit Message

Hemant Kumar Oct. 24, 2020, 2 a.m. UTC
Device provides the total number of HW channels it supports using MHI
configuration register. Host supported HW channels shall not exceed
that value. In order to make this check, a counter is needed to store
total number of HW channels required by host.

Signed-off-by: Hemant Kumar <hemantk@codeaurora.org>
---
 drivers/bus/mhi/core/init.c     | 2 ++
 drivers/bus/mhi/core/internal.h | 1 +
 include/linux/mhi.h             | 1 +
 3 files changed, 4 insertions(+)

Comments

Manivannan Sadhasivam Nov. 6, 2020, 8 a.m. UTC | #1
On Fri, Oct 23, 2020 at 07:00:42PM -0700, Hemant Kumar wrote:
> Device provides the total number of HW channels it supports using MHI
> configuration register. Host supported HW channels shall not exceed
> that value. In order to make this check, a counter is needed to store
> total number of HW channels required by host.
> 
> Signed-off-by: Hemant Kumar <hemantk@codeaurora.org>
> ---
>  drivers/bus/mhi/core/init.c     | 2 ++
>  drivers/bus/mhi/core/internal.h | 1 +
>  include/linux/mhi.h             | 1 +
>  3 files changed, 4 insertions(+)
> 
> diff --git a/drivers/bus/mhi/core/init.c b/drivers/bus/mhi/core/init.c
> index 0ffdebd..70fd6af 100644
> --- a/drivers/bus/mhi/core/init.c
> +++ b/drivers/bus/mhi/core/init.c
> @@ -725,6 +725,8 @@ static int parse_ch_cfg(struct mhi_controller *mhi_cntrl,
>  		mhi_chan = &mhi_cntrl->mhi_chan[chan];
>  		mhi_chan->name = ch_cfg->name;
>  		mhi_chan->chan = chan;
> +		if (chan >= MHI_HW_CHAN_START_IDX)
> +			mhi_cntrl->hw_chan++;
>  
>  		mhi_chan->tre_ring.elements = ch_cfg->num_elements;
>  		if (!mhi_chan->tre_ring.elements)
> diff --git a/drivers/bus/mhi/core/internal.h b/drivers/bus/mhi/core/internal.h
> index 7989269..3d8e480 100644
> --- a/drivers/bus/mhi/core/internal.h
> +++ b/drivers/bus/mhi/core/internal.h
> @@ -454,6 +454,7 @@ enum mhi_pm_state {
>  #define PRIMARY_CMD_RING		0
>  #define MHI_DEV_WAKE_DB			127
>  #define MHI_MAX_MTU			0xffff
> +#define MHI_HW_CHAN_START_IDX		100
>  #define MHI_RANDOM_U32_NONZERO(bmsk)	(prandom_u32_max(bmsk) + 1)
>  
>  enum mhi_er_type {
> diff --git a/include/linux/mhi.h b/include/linux/mhi.h
> index d4841e5..ea441d2 100644
> --- a/include/linux/mhi.h
> +++ b/include/linux/mhi.h
> @@ -389,6 +389,7 @@ struct mhi_controller {
>  	struct list_head lpm_chans;
>  	int *irq;
>  	u32 max_chan;
> +	u32 hw_chan;

Please add Kdoc for this member. With that,

Reviewed-by: Manivannan Sadhasivam <manivannan.sadhasivam@linaro.org>

Thanks,
Mani

>  	u32 total_ev_rings;
>  	u32 hw_ev_rings;
>  	u32 sw_ev_rings;
> -- 
> The Qualcomm Innovation Center, Inc. is a member of the Code Aurora Forum,
> a Linux Foundation Collaborative Project
>

Patch
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diff --git a/drivers/bus/mhi/core/init.c b/drivers/bus/mhi/core/init.c
index 0ffdebd..70fd6af 100644
--- a/drivers/bus/mhi/core/init.c
+++ b/drivers/bus/mhi/core/init.c
@@ -725,6 +725,8 @@  static int parse_ch_cfg(struct mhi_controller *mhi_cntrl,
 		mhi_chan = &mhi_cntrl->mhi_chan[chan];
 		mhi_chan->name = ch_cfg->name;
 		mhi_chan->chan = chan;
+		if (chan >= MHI_HW_CHAN_START_IDX)
+			mhi_cntrl->hw_chan++;
 
 		mhi_chan->tre_ring.elements = ch_cfg->num_elements;
 		if (!mhi_chan->tre_ring.elements)
diff --git a/drivers/bus/mhi/core/internal.h b/drivers/bus/mhi/core/internal.h
index 7989269..3d8e480 100644
--- a/drivers/bus/mhi/core/internal.h
+++ b/drivers/bus/mhi/core/internal.h
@@ -454,6 +454,7 @@  enum mhi_pm_state {
 #define PRIMARY_CMD_RING		0
 #define MHI_DEV_WAKE_DB			127
 #define MHI_MAX_MTU			0xffff
+#define MHI_HW_CHAN_START_IDX		100
 #define MHI_RANDOM_U32_NONZERO(bmsk)	(prandom_u32_max(bmsk) + 1)
 
 enum mhi_er_type {
diff --git a/include/linux/mhi.h b/include/linux/mhi.h
index d4841e5..ea441d2 100644
--- a/include/linux/mhi.h
+++ b/include/linux/mhi.h
@@ -389,6 +389,7 @@  struct mhi_controller {
 	struct list_head lpm_chans;
 	int *irq;
 	u32 max_chan;
+	u32 hw_chan;
 	u32 total_ev_rings;
 	u32 hw_ev_rings;
 	u32 sw_ev_rings;