linux-kernel - Re: [PATCH 2/9] soc: qcom: llcc: Update the logic for version info extraction

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Message-ID: <8f0d544f-ea79-9fab-9579-7bdfed6dcf1b@quicinc.com>
Date:   Fri, 28 Jan 2022 12:59:29 +0530
From:   Sai Prakash Ranjan <quic_saipraka@...cinc.com>
To:     Andy Gross <agross@...nel.org>,
        Bjorn Andersson <bjorn.andersson@...aro.org>
CC:     <devicetree@...r.kernel.org>,
        <linux-arm-kernel@...ts.infradead.org>,
        <linux-kernel@...r.kernel.org>, <linux-arm-msm@...r.kernel.org>,
        Vinod Koul <vkoul@...nel.org>,
        Manivannan Sadhasivam <manivannan.sadhasivam@...aro.org>,
        Rajendra Nayak <quic_rjendra@...cinc.com>
Subject: Re: [PATCH 2/9] soc: qcom: llcc: Update the logic for version info
 extraction

On 1/28/2022 12:39 PM, Sai Prakash Ranjan wrote:
> LLCC HW version info is made up of major, branch, minor and echo
> version bits each of which are 8bits. Several features in newer
> LLCC HW are based on the full version rather than just major or
> minor versions such as write-subcache enable which is applicable
> for versions greater than v2.0.0.0 and upcoming write-subcache
> cacheable for SM8450 SoC which is only present in versions v2.1.0.0
> and later, so it makes it easier and cleaner to just directly
> compare with the full version than adding additional major/branch/
> minor/echo version checks. So remove the earlier major version check
> and add full version check for those features.
>
> Signed-off-by: Sai Prakash Ranjan <quic_saipraka@...cinc.com>
> ---
>   drivers/soc/qcom/llcc-qcom.c       | 9 ++++-----
>   include/linux/soc/qcom/llcc-qcom.h | 4 ++--
>   2 files changed, 6 insertions(+), 7 deletions(-)
>
> diff --git a/drivers/soc/qcom/llcc-qcom.c b/drivers/soc/qcom/llcc-qcom.c
> index b3a34f117a7c..a06764f16023 100644
> --- a/drivers/soc/qcom/llcc-qcom.c
> +++ b/drivers/soc/qcom/llcc-qcom.c
> @@ -37,7 +37,6 @@
>   #define CACHE_LINE_SIZE_SHIFT         6
>   
>   #define LLCC_COMMON_HW_INFO           0x00030000
> -#define LLCC_MAJOR_VERSION_MASK       GENMASK(31, 24)
>   
>   #define LLCC_COMMON_STATUS0           0x0003000c
>   #define LLCC_LB_CNT_MASK              GENMASK(31, 28)
> @@ -55,6 +54,8 @@
>   
>   #define BANK_OFFSET_STRIDE	      0x80000
>   
> +#define LLCC_VERSION_2_0_0_0          0x02000000
> +
>   /**
>    * struct llcc_slice_config - Data associated with the llcc slice
>    * @usecase_id: Unique id for the client's use case
> @@ -504,7 +505,7 @@ static int _qcom_llcc_cfg_program(const struct llcc_slice_config *config,
>   			return ret;
>   	}
>   
> -	if (drv_data->major_version == 2) {
> +	if (drv_data->version >= LLCC_VERSION_2_0_0_0) {
>   		u32 wren;
>   
>   		wren = config->write_scid_en << config->slice_id;
> @@ -598,13 +599,11 @@ static int qcom_llcc_probe(struct platform_device *pdev)
>   		goto err;
>   	}
>   
> -	/* Extract major version of the IP */
> +	/* Extract version of the IP */
>   	ret = regmap_read(drv_data->bcast_regmap, LLCC_COMMON_HW_INFO, &version);
>   	if (ret)
>   		goto err;
>   
> -	drv_data->major_version = FIELD_GET(LLCC_MAJOR_VERSION_MASK, version);
> -

Sorry, I missed assigning version info to drv_data here in this version. 
I am sending a v2 with the fix.

Thanks,
Sai

>   	ret = regmap_read(drv_data->regmap, LLCC_COMMON_STATUS0,
>   						&num_banks);
>   	if (ret)
> diff --git a/include/linux/soc/qcom/llcc-qcom.h b/include/linux/soc/qcom/llcc-qcom.h
> index 9e8fd92c96b7..beecf00b707d 100644
> --- a/include/linux/soc/qcom/llcc-qcom.h
> +++ b/include/linux/soc/qcom/llcc-qcom.h
> @@ -83,7 +83,7 @@ struct llcc_edac_reg_data {
>    * @bitmap: Bit map to track the active slice ids
>    * @offsets: Pointer to the bank offsets array
>    * @ecc_irq: interrupt for llcc cache error detection and reporting
> - * @major_version: Indicates the LLCC major version
> + * @version: Indicates the LLCC version
>    */
>   struct llcc_drv_data {
>   	struct regmap *regmap;
> @@ -96,7 +96,7 @@ struct llcc_drv_data {
>   	unsigned long *bitmap;
>   	u32 *offsets;
>   	int ecc_irq;
> -	u32 major_version;
> +	u32 version;
>   };
>   
>   #if IS_ENABLED(CONFIG_QCOM_LLCC)