linux-kernel - Re: [PATCH 1/2] platform/chrome: cros

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Message-ID: <Y9Lp/T5RezpCQ5Zx@google.com>
Date:   Thu, 26 Jan 2023 13:00:45 -0800
From:   Benson Leung <bleung@...gle.com>
To:     Prashant Malani <pmalani@...omium.org>
Cc:     linux-kernel@...r.kernel.org, chrome-platform@...ts.linux.dev,
        bleung@...omium.org, heikki.krogerus@...ux.intel.com,
        Daisuke Nojiri <dnojiri@...omium.org>,
        "Dustin L. Howett" <dustin@...ett.net>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Guenter Roeck <groeck@...omium.org>,
        "Gustavo A. R. Silva" <gustavoars@...nel.org>,
        Lee Jones <lee@...nel.org>,
        Tinghan Shen <tinghan.shen@...iatek.com>,
        Tzung-Bi Shih <tzungbi@...nel.org>
Subject: Re: [PATCH 1/2] platform/chrome: cros_ec: Add VDM attention headers

Hi Prashant,

On Thu, Jan 26, 2023 at 08:55:45PM +0000, Prashant Malani wrote:
> Incorporate updates to the EC headers to support the retrieval of VDM
> Attention messages from port partners. These headers are already present
> in the ChromeOS EC codebase. [1]
> 
> [1] https://source.chromium.org/chromium/chromiumos/platform/ec/+/main:include/ec_commands.h
> 
> Signed-off-by: Prashant Malani <pmalani@...omium.org>

Reviewed-by: Benson Leung <bleung@...omium.org>


> ---
>  include/linux/platform_data/cros_ec_commands.h | 16 +++++++++++++---
>  1 file changed, 13 insertions(+), 3 deletions(-)
> 
> diff --git a/include/linux/platform_data/cros_ec_commands.h b/include/linux/platform_data/cros_ec_commands.h
> index b9c4a3964247..ec327638c6eb 100644
> --- a/include/linux/platform_data/cros_ec_commands.h
> +++ b/include/linux/platform_data/cros_ec_commands.h
> @@ -5862,6 +5862,7 @@ enum tcpc_cc_polarity {
>  #define PD_STATUS_EVENT_MUX_1_SET_DONE		BIT(5)
>  #define PD_STATUS_EVENT_VDM_REQ_REPLY		BIT(6)
>  #define PD_STATUS_EVENT_VDM_REQ_FAILED		BIT(7)
> +#define PD_STATUS_EVENT_VDM_ATTENTION			BIT(8)
>  
>  struct ec_params_typec_status {
>  	uint8_t port;
> @@ -5906,7 +5907,8 @@ struct ec_response_typec_status {
>  } __ec_align1;
>  
>  /*
> - * Gather the response to the most recent VDM REQ from the AP
> + * Gather the response to the most recent VDM REQ from the AP, as well
> + * as popping the oldest VDM:Attention from the DPM queue
>   */
>  #define EC_CMD_TYPEC_VDM_RESPONSE 0x013C
>  
> @@ -5919,10 +5921,18 @@ struct ec_response_typec_vdm_response {
>  	uint8_t vdm_data_objects;
>  	/* Partner to address - see enum typec_partner_type */
>  	uint8_t partner_type;
> -	/* Reserved */
> -	uint16_t reserved;
> +	/* enum ec_status describing VDM response */
> +	uint16_t vdm_response_err;
>  	/* VDM data, including VDM header */
>  	uint32_t vdm_response[VDO_MAX_SIZE];
> +	/* Number of 32-bit Attention fields filled in */
> +	uint8_t vdm_attention_objects;
> +	/* Number of remaining messages to consume */
> +	uint8_t vdm_attention_left;
> +	/* Reserved */
> +	uint16_t reserved1;
> +	/* VDM:Attention contents */
> +	uint32_t vdm_attention[2];
>  } __ec_align1;
>  
>  #undef VDO_MAX_SIZE
> -- 
> 2.39.1.456.gfc5497dd1b-goog
> 

-- 
Benson Leung
Staff Software Engineer
Chrome OS Kernel
Google Inc.
bleung@...gle.com
Chromium OS Project
bleung@...omium.org

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