linux-kernel - Re: [PATCH] qcom: Add BCM vote macro to TCS header

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Message-ID: <31e9d2c6-edcd-11b8-4c4b-d51ed2d8f7b7@linaro.org>
Date:   Wed, 24 Jul 2019 18:30:58 +0300
From:   Georgi Djakov <georgi.djakov@...aro.org>
To:     Jordan Crouse <jcrouse@...eaurora.org>,
        freedreno@...ts.freedesktop.org
Cc:     ilina@...eaurora.org, bjorn.andersson@...aro.org,
        linux-pm@...r.kernel.org,
        "Raju P.L.S.S.S.N" <rplsssn@...eaurora.org>,
        linux-arm-msm@...r.kernel.org, linux-kernel@...r.kernel.org,
        Andy Gross <agross@...nel.org>,
        David Brown <david.brown@...aro.org>
Subject: Re: [PATCH] qcom: Add BCM vote macro to TCS header

Hi Jordan,

On 7/17/19 18:53, Jordan Crouse wrote:
> The A6XX family of Adreno GPUs use a microcontroller to control the
> GPU clock independently. The microcontroller also has the capability
> to vote for the bus but doesn't currently do so except for one initial
> vote that is hard coded [1].
> 
> Currently there is no good way to construct a valid TCS command outside
> of the inner workings of the QCOM interconnect driver which is something
> that will need to be addressed for the next generation of GPU drivers.
> 
> To start the process, this change moves the TCS command macros from the
> sdm845 interconnect driver into a soc specific header to make it available
> for future efforts into this area.

I agree that we should move the TCS macros into tsc.h. There is also a similar
macro in drivers/clk/qcom/clk-rpmh.c. Maybe we can replace both with a common one?

Thanks,
Georgi

> 
> [1] https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/tree/drivers/gpu/drm/msm/adreno/a6xx_hfi.c#n219
> 
> Signed-off-by: Jordan Crouse <jcrouse@...eaurora.org>
> ---
> 
>  drivers/interconnect/qcom/sdm845.c | 17 -----------------
>  include/soc/qcom/tcs.h             | 17 +++++++++++++++++
>  2 files changed, 17 insertions(+), 17 deletions(-)
> 
> diff --git a/drivers/interconnect/qcom/sdm845.c b/drivers/interconnect/qcom/sdm845.c
> index 4915b78..79b6f01 100644
> --- a/drivers/interconnect/qcom/sdm845.c
> +++ b/drivers/interconnect/qcom/sdm845.c
> @@ -20,23 +20,6 @@
>  #include <soc/qcom/rpmh.h>
>  #include <soc/qcom/tcs.h>
>  
> -#define BCM_TCS_CMD_COMMIT_SHFT		30
> -#define BCM_TCS_CMD_COMMIT_MASK		0x40000000
> -#define BCM_TCS_CMD_VALID_SHFT		29
> -#define BCM_TCS_CMD_VALID_MASK		0x20000000
> -#define BCM_TCS_CMD_VOTE_X_SHFT		14
> -#define BCM_TCS_CMD_VOTE_MASK		0x3fff
> -#define BCM_TCS_CMD_VOTE_Y_SHFT		0
> -#define BCM_TCS_CMD_VOTE_Y_MASK		0xfffc000
> -
> -#define BCM_TCS_CMD(commit, valid, vote_x, vote_y)		\
> -	(((commit) << BCM_TCS_CMD_COMMIT_SHFT) |		\
> -	((valid) << BCM_TCS_CMD_VALID_SHFT) |			\
> -	((cpu_to_le32(vote_x) &					\
> -	BCM_TCS_CMD_VOTE_MASK) << BCM_TCS_CMD_VOTE_X_SHFT) |	\
> -	((cpu_to_le32(vote_y) &					\
> -	BCM_TCS_CMD_VOTE_MASK) << BCM_TCS_CMD_VOTE_Y_SHFT))
> -
>  #define to_qcom_provider(_provider) \
>  	container_of(_provider, struct qcom_icc_provider, provider)
>  
> diff --git a/include/soc/qcom/tcs.h b/include/soc/qcom/tcs.h
> index 262876a..6012a9e 100644
> --- a/include/soc/qcom/tcs.h
> +++ b/include/soc/qcom/tcs.h
> @@ -53,4 +53,21 @@ struct tcs_request {
>  	struct tcs_cmd *cmds;
>  };
>  
> +#define BCM_TCS_CMD_COMMIT_SHFT		30
> +#define BCM_TCS_CMD_COMMIT_MASK		0x40000000
> +#define BCM_TCS_CMD_VALID_SHFT		29
> +#define BCM_TCS_CMD_VALID_MASK		0x20000000
> +#define BCM_TCS_CMD_VOTE_X_SHFT		14
> +#define BCM_TCS_CMD_VOTE_MASK		0x3fff
> +#define BCM_TCS_CMD_VOTE_Y_SHFT		0
> +#define BCM_TCS_CMD_VOTE_Y_MASK		0xfffc000
> +
> +#define BCM_TCS_CMD(commit, valid, vote_x, vote_y)		\
> +	(((commit) << BCM_TCS_CMD_COMMIT_SHFT) |		\
> +	((valid) << BCM_TCS_CMD_VALID_SHFT) |			\
> +	((cpu_to_le32(vote_x) &					\
> +	BCM_TCS_CMD_VOTE_MASK) << BCM_TCS_CMD_VOTE_X_SHFT) |	\
> +	((cpu_to_le32(vote_y) &					\
> +	BCM_TCS_CMD_VOTE_MASK) << BCM_TCS_CMD_VOTE_Y_SHFT))
> +
>  #endif /* __SOC_QCOM_TCS_H__ */
>