linux-kernel - Re: [PATCH] drm/msm/a6xx: add build_bw

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Date:   Fri, 10 Jul 2020 11:33:18 -0600
From:   Jordan Crouse <jcrouse@...eaurora.org>
To:     Jonathan Marek <jonathan@...ek.ca>
Cc:     freedreno@...ts.freedesktop.org, Rob Clark <robdclark@...il.com>,
        Sean Paul <sean@...rly.run>, David Airlie <airlied@...ux.ie>,
        Daniel Vetter <daniel@...ll.ch>,
        kbuild test robot <lkp@...el.com>,
        "open list:DRM DRIVER FOR MSM ADRENO GPU" 
        <linux-arm-msm@...r.kernel.org>,
        "open list:DRM DRIVER FOR MSM ADRENO GPU" 
        <dri-devel@...ts.freedesktop.org>,
        open list <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] drm/msm/a6xx: add build_bw_table for A640/A650

On Tue, Jun 30, 2020 at 11:09:57PM -0400, Jonathan Marek wrote:
> This sets up bw tables for A640/A650 similar to A618/A630, 0 DDR bandwidth
> vote, and the CNOC vote. A640 has the same CNOC addresses as A630 and was
> working, but this is required for A650 to work.
> 
> Eventually the bw table should be filled by querying the interconnect
> driver for each BW in the dts, but use these dummy tables for now.

Reviewed-by: Jordan Crouse <jcrouse@...eaurora.org>

And yes, I agree that we need to move this into the generic API sooner rather
than later, but this should be good enough to get a working GPU/GMU.

> Signed-off-by: Jonathan Marek <jonathan@...ek.ca>
> ---
>  drivers/gpu/drm/msm/adreno/a6xx_hfi.c | 74 +++++++++++++++++++++++++++
>  1 file changed, 74 insertions(+)
> 
> diff --git a/drivers/gpu/drm/msm/adreno/a6xx_hfi.c b/drivers/gpu/drm/msm/adreno/a6xx_hfi.c
> index 9921e632f1ca..ccd44d0418f8 100644
> --- a/drivers/gpu/drm/msm/adreno/a6xx_hfi.c
> +++ b/drivers/gpu/drm/msm/adreno/a6xx_hfi.c
> @@ -281,6 +281,76 @@ static void a618_build_bw_table(struct a6xx_hfi_msg_bw_table *msg)
>  	msg->cnoc_cmds_data[1][0] =  0x60000001;
>  }
>  
> +static void a640_build_bw_table(struct a6xx_hfi_msg_bw_table *msg)
> +{
> +	/*
> +	 * Send a single "off" entry just to get things running
> +	 * TODO: bus scaling
> +	 */
> +	msg->bw_level_num = 1;
> +
> +	msg->ddr_cmds_num = 3;
> +	msg->ddr_wait_bitmask = 0x01;
> +
> +	msg->ddr_cmds_addrs[0] = 0x50000;
> +	msg->ddr_cmds_addrs[1] = 0x5003c;
> +	msg->ddr_cmds_addrs[2] = 0x5000c;
> +
> +	msg->ddr_cmds_data[0][0] =  0x40000000;
> +	msg->ddr_cmds_data[0][1] =  0x40000000;
> +	msg->ddr_cmds_data[0][2] =  0x40000000;
> +
> +	/*
> +	 * These are the CX (CNOC) votes - these are used by the GMU but the
> +	 * votes are known and fixed for the target
> +	 */
> +	msg->cnoc_cmds_num = 3;
> +	msg->cnoc_wait_bitmask = 0x01;
> +
> +	msg->cnoc_cmds_addrs[0] = 0x50034;
> +	msg->cnoc_cmds_addrs[1] = 0x5007c;
> +	msg->cnoc_cmds_addrs[2] = 0x5004c;
> +
> +	msg->cnoc_cmds_data[0][0] =  0x40000000;
> +	msg->cnoc_cmds_data[0][1] =  0x00000000;
> +	msg->cnoc_cmds_data[0][2] =  0x40000000;
> +
> +	msg->cnoc_cmds_data[1][0] =  0x60000001;
> +	msg->cnoc_cmds_data[1][1] =  0x20000001;
> +	msg->cnoc_cmds_data[1][2] =  0x60000001;
> +}
> +
> +static void a650_build_bw_table(struct a6xx_hfi_msg_bw_table *msg)
> +{
> +	/*
> +	 * Send a single "off" entry just to get things running
> +	 * TODO: bus scaling
> +	 */
> +	msg->bw_level_num = 1;
> +
> +	msg->ddr_cmds_num = 3;
> +	msg->ddr_wait_bitmask = 0x01;
> +
> +	msg->ddr_cmds_addrs[0] = 0x50000;
> +	msg->ddr_cmds_addrs[1] = 0x50004;
> +	msg->ddr_cmds_addrs[2] = 0x5007c;
> +
> +	msg->ddr_cmds_data[0][0] =  0x40000000;
> +	msg->ddr_cmds_data[0][1] =  0x40000000;
> +	msg->ddr_cmds_data[0][2] =  0x40000000;
> +
> +	/*
> +	 * These are the CX (CNOC) votes - these are used by the GMU but the
> +	 * votes are known and fixed for the target
> +	 */
> +	msg->cnoc_cmds_num = 1;
> +	msg->cnoc_wait_bitmask = 0x01;
> +
> +	msg->cnoc_cmds_addrs[0] = 0x500a4;
> +	msg->cnoc_cmds_data[0][0] =  0x40000000;
> +	msg->cnoc_cmds_data[1][0] =  0x60000001;
> +}
> +
>  static void a6xx_build_bw_table(struct a6xx_hfi_msg_bw_table *msg)
>  {
>  	/* Send a single "off" entry since the 630 GMU doesn't do bus scaling */
> @@ -327,6 +397,10 @@ static int a6xx_hfi_send_bw_table(struct a6xx_gmu *gmu)
>  
>  	if (adreno_is_a618(adreno_gpu))
>  		a618_build_bw_table(&msg);
> +	else if (adreno_is_a640(adreno_gpu))
> +		a640_build_bw_table(&msg);
> +	else if (adreno_is_a650(adreno_gpu))
> +		a650_build_bw_table(&msg);
>  	else
>  		a6xx_build_bw_table(&msg);
>  
> -- 
> 2.26.1
> 

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