linux-kernel - Re: [PATCH 5/5] soc: qcom: llcc: Add regmap for Broadcast

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Message-ID: <CAA8EJppapW5nOFphBWove1ni8nbkA=xHON9D13NYeYHhyqL1Fg@mail.gmail.com>
Date: Fri, 26 Jan 2024 22:29:59 +0200
From: Dmitry Baryshkov <dmitry.baryshkov@...aro.org>
To: Unnathi Chalicheemala <quic_uchalich@...cinc.com>
Cc: Bjorn Andersson <andersson@...nel.org>, Konrad Dybcio <konrad.dybcio@...aro.org>, 
	Rob Herring <robh+dt@...nel.org>, 
	Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>, Conor Dooley <conor+dt@...nel.org>, 
	linux-arm-msm@...r.kernel.org, devicetree@...r.kernel.org, 
	linux-kernel@...r.kernel.org, kernel@...cinc.com
Subject: Re: [PATCH 5/5] soc: qcom: llcc: Add regmap for Broadcast_AND region

On Fri, 26 Jan 2024 at 21:48, Unnathi Chalicheemala
<quic_uchalich@...cinc.com> wrote:
>
> To support CSR programming, a broadcast interface is used to program
> all channels in a single command. Until SM8450 there was only one
> broadcast region (Broadcast_OR) used to broadcast write and check
> for status bit 0. From SM8450 onwards another broadcast region
> (Broadcast_AND) has been added which checks for status bit 1.
>
> Update llcc_drv_data structure with new regmap for Broadcast_AND
> region and initialize regmap for Broadcast_AND region when HW block
> version is greater than 4.1 for backwards compatibility.
>
> Switch from broadcast_OR to broadcast_AND region for checking
> status bit 1 as Broadcast_OR region checks only for bit 0.

This breaks backwards compatibility with the existing DT files, doesn't it?

> While at it, also check return value after reading Broadcast_OR
> region in llcc_update_act_ctrl().

Separate patch, Fixes tag.

>
> Signed-off-by: Unnathi Chalicheemala <quic_uchalich@...cinc.com>
> ---
>  drivers/soc/qcom/llcc-qcom.c       | 12 +++++++++++-
>  include/linux/soc/qcom/llcc-qcom.h |  4 +++-
>  2 files changed, 14 insertions(+), 2 deletions(-)
>
> diff --git a/drivers/soc/qcom/llcc-qcom.c b/drivers/soc/qcom/llcc-qcom.c
> index 4ca88eaebf06..5a2dac2d4772 100644
> --- a/drivers/soc/qcom/llcc-qcom.c
> +++ b/drivers/soc/qcom/llcc-qcom.c
> @@ -849,7 +849,7 @@ static int llcc_update_act_ctrl(u32 sid,
>                 return ret;
>
>         if (drv_data->version >= LLCC_VERSION_4_1_0_0) {
> -               ret = regmap_read_poll_timeout(drv_data->bcast_regmap, status_reg,
> +               ret = regmap_read_poll_timeout(drv_data->bcast_and_regmap, status_reg,
>                                       slice_status, (slice_status & ACT_COMPLETE),
>                                       0, LLCC_STATUS_READ_DELAY);
>                 if (ret)
> @@ -859,6 +859,8 @@ static int llcc_update_act_ctrl(u32 sid,
>         ret = regmap_read_poll_timeout(drv_data->bcast_regmap, status_reg,
>                                       slice_status, !(slice_status & status),
>                                       0, LLCC_STATUS_READ_DELAY);
> +       if (ret)
> +               return ret;
>
>         if (drv_data->version >= LLCC_VERSION_4_1_0_0)
>                 ret = regmap_write(drv_data->bcast_regmap, act_clear_reg,
> @@ -1282,6 +1284,14 @@ static int qcom_llcc_probe(struct platform_device *pdev)
>
>         drv_data->version = version;
>
> +       if (drv_data->version >= LLCC_VERSION_4_1_0_0) {
> +               drv_data->bcast_and_regmap = qcom_llcc_init_mmio(pdev, i + 1, "llcc_broadcast_and_base");
> +               if (IS_ERR(drv_data->bcast_and_regmap)) {
> +                       ret = PTR_ERR(drv_data->bcast_and_regmap);
> +                       goto err;
> +               }
> +       }
> +
>         llcc_cfg = cfg->sct_data;
>         sz = cfg->size;
>
> diff --git a/include/linux/soc/qcom/llcc-qcom.h b/include/linux/soc/qcom/llcc-qcom.h
> index 1a886666bbb6..9e9f528b1370 100644
> --- a/include/linux/soc/qcom/llcc-qcom.h
> +++ b/include/linux/soc/qcom/llcc-qcom.h
> @@ -115,7 +115,8 @@ struct llcc_edac_reg_offset {
>  /**
>   * struct llcc_drv_data - Data associated with the llcc driver
>   * @regmaps: regmaps associated with the llcc device
> - * @bcast_regmap: regmap associated with llcc broadcast offset
> + * @bcast_regmap: regmap associated with llcc broadcast OR offset
> + * @bcast_and_regmap: regmap associated with llcc broadcast AND offset
>   * @cfg: pointer to the data structure for slice configuration
>   * @edac_reg_offset: Offset of the LLCC EDAC registers
>   * @lock: mutex associated with each slice
> @@ -129,6 +130,7 @@ struct llcc_edac_reg_offset {
>  struct llcc_drv_data {
>         struct regmap **regmaps;
>         struct regmap *bcast_regmap;
> +       struct regmap *bcast_and_regmap;
>         const struct llcc_slice_config *cfg;
>         const struct llcc_edac_reg_offset *edac_reg_offset;
>         struct mutex lock;
> --
> 2.25.1
>
>


-- 
With best wishes
Dmitry