linux-kernel - Re: [PATCH 4/6] soc: qcom: Add LLCC support for multi channel DDR

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Date:   Thu, 10 Aug 2023 12:52:34 +0100
From:   Bryan O'Donoghue <pure.logic@...us-software.ie>
To:     Komal Bajaj <quic_kbajaj@...cinc.com>, agross@...nel.org,
        andersson@...nel.org, konrad.dybcio@...aro.org, robh+dt@...nel.org,
        krzysztof.kozlowski+dt@...aro.org, conor+dt@...nel.org,
        srinivas.kandagatla@...aro.org
Cc:     linux-arm-msm@...r.kernel.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH 4/6] soc: qcom: Add LLCC support for multi channel DDR

On 10/08/2023 07:11, Komal Bajaj wrote:
> Add LLCC support for multi channel DDR configuration
> based on a feature register.
> 
> Signed-off-by: Komal Bajaj <quic_kbajaj@...cinc.com>
> ---
>   drivers/soc/qcom/llcc-qcom.c | 27 +++++++++++++++++++++++++--
>   1 file changed, 25 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/soc/qcom/llcc-qcom.c b/drivers/soc/qcom/llcc-qcom.c
> index 76e8083d053d..4fad2cff5e1e 100644
> --- a/drivers/soc/qcom/llcc-qcom.c
> +++ b/drivers/soc/qcom/llcc-qcom.c
> @@ -12,6 +12,7 @@
>   #include <linux/kernel.h>
>   #include <linux/module.h>
>   #include <linux/mutex.h>
> +#include <linux/nvmem-consumer.h>
>   #include <linux/of.h>
>   #include <linux/of_device.h>
>   #include <linux/regmap.h>
> @@ -998,6 +999,24 @@ static int qcom_llcc_cfg_program(struct platform_device *pdev,
>   	return ret;
>   }
> 
> +static int qcom_llcc_get_cfg_index(struct platform_device *pdev, u8 *cfg_index, int num_config)
> +{
> +	int ret;
> +
> +	ret = nvmem_cell_read_u8(&pdev->dev, "multi-chan-ddr", cfg_index);
> +	if (ret == -ENOENT || ret == -EOPNOTSUPP) {
> +		if (num_config != DEF_NUM_CFG)
> +			return -EINVAL;
> +		*cfg_index = DEF_NUM_CFG - 1;
> +		return 0;
> +	}
> +
> +	if (!ret && *cfg_index >= num_config)
> +		ret = -EINVAL;
> +
> +	return ret;
> +}
> +
>   static int qcom_llcc_remove(struct platform_device *pdev)
>   {
>   	/* Set the global pointer to a error code to avoid referencing it */
> @@ -1034,6 +1053,7 @@ static int qcom_llcc_probe(struct platform_device *pdev)
>   	const struct qcom_llcc_config *cfg;
>   	const struct llcc_slice_config *llcc_cfg;
>   	u32 sz;
> +	u8 cfg_index;
>   	u32 version;
>   	struct regmap *regmap;
> 
> @@ -1051,11 +1071,14 @@ static int qcom_llcc_probe(struct platform_device *pdev)
>   	}
> 
>   	cfgs = of_device_get_match_data(&pdev->dev);
> -	if (!cfgs || cfgs->num_config != DEF_NUM_CFG) {
> +	if (!cfgs) {
>   		ret = -EINVAL;
>   		goto err;
>   	}
> -	cfg = &cfgs->llcc_config[DEF_NUM_CFG - 1];
> +	ret = qcom_llcc_get_cfg_index(pdev, &cfg_index, cfgs->num_config);
> +	if (ret)
> +		goto err;
> +	cfg = &cfgs->llcc_config[cfg_index];
> 
>   	ret = regmap_read(regmap, cfg->reg_offset[LLCC_COMMON_STATUS0], &num_banks);
>   	if (ret)
> --
> 2.41.0
> 

This patch doesn't apply to -next

deckard@...ittarius-a:~/Development/qualcomm/qlt-kernel$ git checkout -b 
llc-review-v0 linux-next/master
branch 'llc-review-v0' set up to track 'linux-next/master'.
Switched to a new branch 'llc-review-v0'
deckard@...ittarius-a:~/Development/qualcomm/qlt-kernel$ git am < 
../patches/linux/lllc-review/v0/\[PATCH\ 1_6\]\ dt-bindings\:\ cache\:\ 
qcom\,llcc\:\ Add\ LLCC\ compatible\ for\ QDU1000_QRU1000\ -\ Komal\ 
Bajaj\ \<quic_kbajaj@...cinc.com\>\ -\ 2023-08-10\ 0711.eml
Applying: dt-bindings: cache: qcom,llcc: Add LLCC compatible for 
QDU1000/QRU1000
deckard@...ittarius-a:~/Development/qualcomm/qlt-kernel$ git am < 
../patches/linux/lllc-review/v0/\[PATCH\ 2_6\]\ soc\:\ qcom\:\ llcc\:\ 
Refactor\ llcc\ driver\ to\ support\ multiple\ configuration\ -\ Komal\ 
Bajaj\ \<quic_kbajaj@...cinc.com\>\ -\ 2023-08-10\ 0711.eml
Applying: soc: qcom: llcc: Refactor llcc driver to support multiple 
configuration
deckard@...ittarius-a:~/Development/qualcomm/qlt-kernel$ git am < 
../patches/linux/lllc-review/v0/\[PATCH\ 3_6\]\ nvmem\:\ core\:\ Add\ 
stub\ for\ nvmem_cell_read_u8\ -\ Komal\ Bajaj\ 
\<quic_kbajaj@...cinc.com\>\ -\ 2023-08-10\ 0711.eml
Applying: nvmem: core: Add stub for nvmem_cell_read_u8
deckard@...ittarius-a:~/Development/qualcomm/qlt-kernel$ git am < 
../patches/linux/lllc-review/v0/\[PATCH\ 4_6\]\ soc\:\ qcom\:\ Add\ 
LLCC\ support\ for\ multi\ channel\ DDR\ -\ Komal\ Bajaj\ 
\<quic_kbajaj@...cinc.com\>\ -\ 2023-08-10\ 0711.eml
Applying: soc: qcom: Add LLCC support for multi channel DDR
error: patch failed: drivers/soc/qcom/llcc-qcom.c:12
error: drivers/soc/qcom/llcc-qcom.c: patch does not apply
Patch failed at 0001 soc: qcom: Add LLCC support for multi channel DDR
hint: Use 'git am --show-current-patch=diff' to see the failed patch

6f48f84d73ab5 (HEAD -> llc-review-v0) HEAD@{0}: am --abort
6f48f84d73ab5 (HEAD -> llc-review-v0) HEAD@{1}: am: nvmem: core: Add 
stub for nvmem_cell_read_u8
7e5adcab05af4 HEAD@{2}: am: soc: qcom: llcc: Refactor llcc driver to 
support multiple configuration
0990c31774948 HEAD@{3}: am: dt-bindings: cache: qcom,llcc: Add LLCC 
compatible for QDU1000/QRU1000
21ef7b1e17d03 (tag: next-20230809, linux-next/master) HEAD@{4}: 
checkout: moving from linux-next-23-08-07-db410c-rb3-camss-dts-v2 to 
llc-review-v0

---
bod