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Fri, 09 Apr 2021 19:10:06 -0700 (PDT) Sender: Guenter Roeck Subject: Re: [PATCH v2 2/6] usb: typec: tcpm: Address incorrect values of tcpm psy for pps supply To: Badhri Jagan Sridharan , Heikki Krogerus , Greg Kroah-Hartman , Rob Herring , Adam Thomson Cc: linux-usb@vger.kernel.org, linux-kernel@vger.kernel.org, devicetree@vger.kernel.org, Kyle Tso References: <20210407200723.1914388-1-badhri@google.com> <20210407200723.1914388-2-badhri@google.com> From: Guenter Roeck Autocrypt: addr=linux@roeck-us.net; keydata= xsFNBE6H1WcBEACu6jIcw5kZ5dGeJ7E7B2uweQR/4FGxH10/H1O1+ApmcQ9i87XdZQiB9cpN RYHA7RCEK2dh6dDccykQk3bC90xXMPg+O3R+C/SkwcnUak1UZaeK/SwQbq/t0tkMzYDRxfJ7 nyFiKxUehbNF3r9qlJgPqONwX5vJy4/GvDHdddSCxV41P/ejsZ8PykxyJs98UWhF54tGRWFl 7i1xvaDB9lN5WTLRKSO7wICuLiSz5WZHXMkyF4d+/O5ll7yz/o/JxK5vO/sduYDIlFTvBZDh gzaEtNf5tQjsjG4io8E0Yq0ViobLkS2RTNZT8ICq/Jmvl0SpbHRvYwa2DhNsK0YjHFQBB0FX IdhdUEzNefcNcYvqigJpdICoP2e4yJSyflHFO4dr0OrdnGLe1Zi/8Xo/2+M1dSSEt196rXaC kwu2KgIgmkRBb3cp2vIBBIIowU8W3qC1+w+RdMUrZxKGWJ3juwcgveJlzMpMZNyM1jobSXZ0 VHGMNJ3MwXlrEFPXaYJgibcg6brM6wGfX/LBvc/haWw4yO24lT5eitm4UBdIy9pKkKmHHh7s jfZJkB5fWKVdoCv/omy6UyH6ykLOPFugl+hVL2Prf8xrXuZe1CMS7ID9Lc8FaL1ROIN/W8Vk BIsJMaWOhks//7d92Uf3EArDlDShwR2+D+AMon8NULuLBHiEUQARAQABzTJHdWVudGVyIFJv ZWNrIChMaW51eCBhY2NvdW50KSA8bGludXhAcm9lY2stdXMubmV0PsLBgQQTAQIAKwIbAwYL CQgHAwIGFQgCCQoLBBYCAwECHgECF4ACGQEFAlVcphcFCRmg06EACgkQyx8mb86fmYFg0RAA nzXJzuPkLJaOmSIzPAqqnutACchT/meCOgMEpS5oLf6xn5ySZkl23OxuhpMZTVX+49c9pvBx hpvl5bCWFu5qC1jC2eWRYU+aZZE4sxMaAGeWenQJsiG9lP8wkfCJP3ockNu0ZXXAXwIbY1O1 c+l11zQkZw89zNgWgKobKzrDMBFOYtAh0pAInZ9TSn7oA4Ctejouo5wUugmk8MrDtUVXmEA9 7f9fgKYSwl/H7dfKKsS1bDOpyJlqhEAH94BHJdK/b1tzwJCFAXFhMlmlbYEk8kWjcxQgDWMu GAthQzSuAyhqyZwFcOlMCNbAcTSQawSo3B9yM9mHJne5RrAbVz4TWLnEaX8gA5xK3uCNCeyI sqYuzA4OzcMwnnTASvzsGZoYHTFP3DQwf2nzxD6yBGCfwNGIYfS0i8YN8XcBgEcDFMWpOQhT Pu3HeztMnF3HXrc0t7e5rDW9zCh3k2PA6D2NV4fews9KDFhLlTfCVzf0PS1dRVVWM+4jVl6l HRIAgWp+2/f8dx5vPc4Ycp4IsZN0l1h9uT7qm1KTwz+sSl1zOqKD/BpfGNZfLRRxrXthvvY8 BltcuZ4+PGFTcRkMytUbMDFMF9Cjd2W9dXD35PEtvj8wnEyzIos8bbgtLrGTv/SYhmPpahJA l8hPhYvmAvpOmusUUyB30StsHIU2LLccUPPOwU0ETofVZwEQALlLbQeBDTDbwQYrj0gbx3bq 7kpKABxN2MqeuqGr02DpS9883d/t7ontxasXoEz2GTioevvRmllJlPQERVxM8gQoNg22twF7 pB/zsrIjxkE9heE4wYfN1AyzT+AxgYN6f8hVQ7Nrc9XgZZe+8IkuW/Nf64KzNJXnSH4u6nJM J2+Dt274YoFcXR1nG76Q259mKwzbCukKbd6piL+VsT/qBrLhZe9Ivbjq5WMdkQKnP7gYKCAi pNVJC4enWfivZsYupMd9qn7Uv/oCZDYoBTdMSBUblaLMwlcjnPpOYK5rfHvC4opxl+P/Vzyz 6WC2TLkPtKvYvXmdsI6rnEI4Uucg0Au/Ulg7aqqKhzGPIbVaL+U0Wk82nz6hz+WP2ggTrY1w ZlPlRt8WM9w6WfLf2j+PuGklj37m+KvaOEfLsF1v464dSpy1tQVHhhp8LFTxh/6RWkRIR2uF I4v3Xu/k5D0LhaZHpQ4C+xKsQxpTGuYh2tnRaRL14YMW1dlI3HfeB2gj7Yc8XdHh9vkpPyuT nY/ZsFbnvBtiw7GchKKri2gDhRb2QNNDyBnQn5mRFw7CyuFclAksOdV/sdpQnYlYcRQWOUGY HhQ5eqTRZjm9z+qQe/T0HQpmiPTqQcIaG/edgKVTUjITfA7AJMKLQHgp04Vylb+G6jocnQQX JqvvP09whbqrABEBAAHCwWUEGAECAA8CGwwFAlVcpi8FCRmg08MACgkQyx8mb86fmYHNRQ/+ J0OZsBYP4leJvQF8lx9zif+v4ZY/6C9tTcUv/KNAE5leyrD4IKbnV4PnbrVhjq861it/zRQW cFpWQszZyWRwNPWUUz7ejmm9lAwPbr8xWT4qMSA43VKQ7ZCeTQJ4TC8kjqtcbw41SjkjrcTG wF52zFO4bOWyovVAPncvV9eGA/vtnd3xEZXQiSt91kBSqK28yjxAqK/c3G6i7IX2rg6pzgqh hiH3/1qM2M/LSuqAv0Rwrt/k+pZXE+B4Ud42hwmMr0TfhNxG+X7YKvjKC+SjPjqp0CaztQ0H nsDLSLElVROxCd9m8CAUuHplgmR3seYCOrT4jriMFBtKNPtj2EE4DNV4s7k0Zy+6iRQ8G8ng QjsSqYJx8iAR8JRB7Gm2rQOMv8lSRdjva++GT0VLXtHULdlzg8VjDnFZ3lfz5PWEOeIMk7Rj trjv82EZtrhLuLjHRCaG50OOm0hwPSk1J64R8O3HjSLdertmw7eyAYOo4RuWJguYMg5DRnBk WkRwrSuCn7UG+qVWZeKEsFKFOkynOs3pVbcbq1pxbhk3TRWCGRU5JolI4ohy/7JV1TVbjiDI HP/aVnm6NC8of26P40Pg8EdAhajZnHHjA7FrJXsy3cyIGqvg9os4rNkUWmrCfLLsZDHD8FnU mDW4+i+XlNFUPUYMrIKi9joBhu18ssf5i5Q= Message-ID: <18399115-5897-2c53-f8e5-6cdbd63a9658@roeck-us.net> Date: Fri, 9 Apr 2021 19:10:04 -0700 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:68.0) Gecko/20100101 Thunderbird/68.10.0 MIME-Version: 1.0 In-Reply-To: <20210407200723.1914388-2-badhri@google.com> Content-Type: text/plain; charset=utf-8 Content-Language: en-US Content-Transfer-Encoding: 7bit Precedence: bulk List-ID: X-Mailing-List: linux-usb@vger.kernel.org On 4/7/21 1:07 PM, Badhri Jagan Sridharan wrote: > tcpm_pd_select_pps_apdo overwrites port->pps_data.min_volt, > port->pps_data.max_volt, port->pps_data.max_curr even before > port partner accepts the requests. This leaves incorrect values > in current_limit and supply_voltage that get exported by > "tcpm-source-psy-". Solving this problem by caching the request > values in req_min_volt, req_max_volt, req_max_curr, req_out_volt, > req_op_curr. min_volt, max_volt, max_curr gets updated once the > partner accepts the request. current_limit, supply_voltage gets updated > once local port's tcpm enters SNK_TRANSITION_SINK when the accepted > current_limit and supply_voltage is enforced. > > Fixes: f2a8aa053c176 ("typec: tcpm: Represent source supply through power_supply") > Signed-off-by: Badhri Jagan Sridharan > Reviewed-by: Adam Thomson Reviewed-by: Guenter Roeck > --- > Changes since V1: > * Moved to kerneldoc header as suggested by Greg KH. > * Added reviewed by tags. > --- > drivers/usb/typec/tcpm/tcpm.c | 88 +++++++++++++++++++++-------------- > 1 file changed, 53 insertions(+), 35 deletions(-) > > diff --git a/drivers/usb/typec/tcpm/tcpm.c b/drivers/usb/typec/tcpm/tcpm.c > index 4ea4b30ae885..b4a40099d7e9 100644 > --- a/drivers/usb/typec/tcpm/tcpm.c > +++ b/drivers/usb/typec/tcpm/tcpm.c > @@ -268,12 +268,27 @@ struct pd_mode_data { > struct typec_altmode_desc altmode_desc[ALTMODE_DISCOVERY_MAX]; > }; > > +/* > + * @min_volt: Actual min voltage at the local port > + * @req_min_volt: Requested min voltage to the port partner > + * @max_volt: Actual max voltage at the local port > + * @req_max_volt: Requested max voltage to the port partner > + * @max_curr: Actual max current at the local port > + * @req_max_curr: Requested max current of the port partner > + * @req_out_volt: Requested output voltage to the port partner > + * @req_op_curr: Requested operating current to the port partner > + * @supported: Parter has atleast one APDO hence supports PPS > + * @active: PPS mode is active > + */ > struct pd_pps_data { > u32 min_volt; > + u32 req_min_volt; > u32 max_volt; > + u32 req_max_volt; > u32 max_curr; > - u32 out_volt; > - u32 op_curr; > + u32 req_max_curr; > + u32 req_out_volt; > + u32 req_op_curr; > bool supported; > bool active; > }; > @@ -2498,8 +2513,8 @@ static void tcpm_pd_ctrl_request(struct tcpm_port *port, > break; > case SNK_NEGOTIATE_PPS_CAPABILITIES: > /* Revert data back from any requested PPS updates */ > - port->pps_data.out_volt = port->supply_voltage; > - port->pps_data.op_curr = port->current_limit; > + port->pps_data.req_out_volt = port->supply_voltage; > + port->pps_data.req_op_curr = port->current_limit; > port->pps_status = (type == PD_CTRL_WAIT ? > -EAGAIN : -EOPNOTSUPP); > > @@ -2548,8 +2563,11 @@ static void tcpm_pd_ctrl_request(struct tcpm_port *port, > break; > case SNK_NEGOTIATE_PPS_CAPABILITIES: > port->pps_data.active = true; > - port->req_supply_voltage = port->pps_data.out_volt; > - port->req_current_limit = port->pps_data.op_curr; > + port->pps_data.min_volt = port->pps_data.req_min_volt; > + port->pps_data.max_volt = port->pps_data.req_max_volt; > + port->pps_data.max_curr = port->pps_data.req_max_curr; > + port->req_supply_voltage = port->pps_data.req_out_volt; > + port->req_current_limit = port->pps_data.req_op_curr; > tcpm_set_state(port, SNK_TRANSITION_SINK, 0); > break; > case SOFT_RESET_SEND: > @@ -3108,16 +3126,16 @@ static unsigned int tcpm_pd_select_pps_apdo(struct tcpm_port *port) > src = port->source_caps[src_pdo]; > snk = port->snk_pdo[snk_pdo]; > > - port->pps_data.min_volt = max(pdo_pps_apdo_min_voltage(src), > - pdo_pps_apdo_min_voltage(snk)); > - port->pps_data.max_volt = min(pdo_pps_apdo_max_voltage(src), > - pdo_pps_apdo_max_voltage(snk)); > - port->pps_data.max_curr = min_pps_apdo_current(src, snk); > - port->pps_data.out_volt = min(port->pps_data.max_volt, > - max(port->pps_data.min_volt, > - port->pps_data.out_volt)); > - port->pps_data.op_curr = min(port->pps_data.max_curr, > - port->pps_data.op_curr); > + port->pps_data.req_min_volt = max(pdo_pps_apdo_min_voltage(src), > + pdo_pps_apdo_min_voltage(snk)); > + port->pps_data.req_max_volt = min(pdo_pps_apdo_max_voltage(src), > + pdo_pps_apdo_max_voltage(snk)); > + port->pps_data.req_max_curr = min_pps_apdo_current(src, snk); > + port->pps_data.req_out_volt = min(port->pps_data.max_volt, > + max(port->pps_data.min_volt, > + port->pps_data.req_out_volt)); > + port->pps_data.req_op_curr = min(port->pps_data.max_curr, > + port->pps_data.req_op_curr); > power_supply_changed(port->psy); > } > > @@ -3245,10 +3263,10 @@ static int tcpm_pd_build_pps_request(struct tcpm_port *port, u32 *rdo) > tcpm_log(port, "Invalid APDO selected!"); > return -EINVAL; > } > - max_mv = port->pps_data.max_volt; > - max_ma = port->pps_data.max_curr; > - out_mv = port->pps_data.out_volt; > - op_ma = port->pps_data.op_curr; > + max_mv = port->pps_data.req_max_volt; > + max_ma = port->pps_data.req_max_curr; > + out_mv = port->pps_data.req_out_volt; > + op_ma = port->pps_data.req_op_curr; > break; > default: > tcpm_log(port, "Invalid PDO selected!"); > @@ -3295,8 +3313,8 @@ static int tcpm_pd_build_pps_request(struct tcpm_port *port, u32 *rdo) > tcpm_log(port, "Requesting APDO %d: %u mV, %u mA", > src_pdo_index, out_mv, op_ma); > > - port->pps_data.op_curr = op_ma; > - port->pps_data.out_volt = out_mv; > + port->pps_data.req_op_curr = op_ma; > + port->pps_data.req_out_volt = out_mv; > > return 0; > } > @@ -5429,7 +5447,7 @@ static int tcpm_try_role(struct typec_port *p, int role) > return ret; > } > > -static int tcpm_pps_set_op_curr(struct tcpm_port *port, u16 op_curr) > +static int tcpm_pps_set_op_curr(struct tcpm_port *port, u16 req_op_curr) > { > unsigned int target_mw; > int ret; > @@ -5447,12 +5465,12 @@ static int tcpm_pps_set_op_curr(struct tcpm_port *port, u16 op_curr) > goto port_unlock; > } > > - if (op_curr > port->pps_data.max_curr) { > + if (req_op_curr > port->pps_data.max_curr) { > ret = -EINVAL; > goto port_unlock; > } > > - target_mw = (op_curr * port->pps_data.out_volt) / 1000; > + target_mw = (req_op_curr * port->supply_voltage) / 1000; > if (target_mw < port->operating_snk_mw) { > ret = -EINVAL; > goto port_unlock; > @@ -5466,10 +5484,10 @@ static int tcpm_pps_set_op_curr(struct tcpm_port *port, u16 op_curr) > } > > /* Round down operating current to align with PPS valid steps */ > - op_curr = op_curr - (op_curr % RDO_PROG_CURR_MA_STEP); > + req_op_curr = req_op_curr - (req_op_curr % RDO_PROG_CURR_MA_STEP); > > reinit_completion(&port->pps_complete); > - port->pps_data.op_curr = op_curr; > + port->pps_data.req_op_curr = req_op_curr; > port->pps_status = 0; > port->pps_pending = true; > mutex_unlock(&port->lock); > @@ -5490,7 +5508,7 @@ static int tcpm_pps_set_op_curr(struct tcpm_port *port, u16 op_curr) > return ret; > } > > -static int tcpm_pps_set_out_volt(struct tcpm_port *port, u16 out_volt) > +static int tcpm_pps_set_out_volt(struct tcpm_port *port, u16 req_out_volt) > { > unsigned int target_mw; > int ret; > @@ -5508,13 +5526,13 @@ static int tcpm_pps_set_out_volt(struct tcpm_port *port, u16 out_volt) > goto port_unlock; > } > > - if (out_volt < port->pps_data.min_volt || > - out_volt > port->pps_data.max_volt) { > + if (req_out_volt < port->pps_data.min_volt || > + req_out_volt > port->pps_data.max_volt) { > ret = -EINVAL; > goto port_unlock; > } > > - target_mw = (port->pps_data.op_curr * out_volt) / 1000; > + target_mw = (port->current_limit * req_out_volt) / 1000; > if (target_mw < port->operating_snk_mw) { > ret = -EINVAL; > goto port_unlock; > @@ -5528,10 +5546,10 @@ static int tcpm_pps_set_out_volt(struct tcpm_port *port, u16 out_volt) > } > > /* Round down output voltage to align with PPS valid steps */ > - out_volt = out_volt - (out_volt % RDO_PROG_VOLT_MV_STEP); > + req_out_volt = req_out_volt - (req_out_volt % RDO_PROG_VOLT_MV_STEP); > > reinit_completion(&port->pps_complete); > - port->pps_data.out_volt = out_volt; > + port->pps_data.req_out_volt = req_out_volt; > port->pps_status = 0; > port->pps_pending = true; > mutex_unlock(&port->lock); > @@ -5589,8 +5607,8 @@ static int tcpm_pps_activate(struct tcpm_port *port, bool activate) > > /* Trigger PPS request or move back to standard PDO contract */ > if (activate) { > - port->pps_data.out_volt = port->supply_voltage; > - port->pps_data.op_curr = port->current_limit; > + port->pps_data.req_out_volt = port->supply_voltage; > + port->pps_data.req_op_curr = port->current_limit; > } > mutex_unlock(&port->lock); > >