| Message ID | 20231109191355.27738-1-james.quinlan@broadcom.com |
|---|---|
| Headers | show |
| Series | PCI: brcmstb: Configure appropriate HW CLKREQ# mode | expand |
On 11/9/23 11:13, Jim Quinlan wrote: > v7 -- Manivannan Sadhasivam suggested (a) making the property look like a > network phy-mode and (b) keeping the code simple (not counting clkreq > signal appearances, un-advertising capabilites, etc). This is > what I have done. The property is now "brcm,clkreq-mode" and > the values may be one of "safe", "default", and "no-l1ss". The > default setting is to employ the most capable power savings mode. > > v6 -- No code has been changed. > -- Changed commit subject and comment in "#PERST" commit (Bjorn, Cyril) > -- Changed sign-off and author email address for all commits. > This was due to a change in Broadcom's upstreaming policy. > > v5 -- Remove DT property "brcm,completion-timeout-us" from > "DT bindings" commit. Although this error may be reported > as a completion timeout, its cause was traced to an > internal bus timeout which may occur even when there is > no PCIe access being processed. We set a timeout of four > seconds only if we are operating in "L1SS CLKREQ#" mode. > -- Correct CEM 2.0 reference provided by HW engineer, > s/3.2.5.2.5/3.2.5.2.2/ (Bjorn) > -- Add newline to dev_info() string (Stefan) > -- Change variable rval to unsigned (Stefan) > -- s/implementaion/implementation/ (Bjorn) > -- s/superpowersave/powersupersave/ (Bjorn) > -- Slightly modify message on "PERST#" commit. > -- Rebase to torvalds master > > v4 -- New commit that asserts PERST# for 2711/RPi SOCs at PCIe RC > driver probe() time. This is done in Raspian Linux and its > absence may be the cause of a failing test case. > -- New commit that removes stale comment. > > v3 -- Rewrote commit msgs and comments refering panics if L1SS > is enabled/disabled; the code snippet that unadvertises L1SS > eliminates the panic scenario. (Bjorn) > -- Add reference for "400ns of CLKREQ# assertion" blurb (Bjorn) > -- Put binding names in DT commit Subject (Bjorn) > -- Add a verb to a commit's subject line (Bjorn) > -- s/accomodat(\w+)/accommodat$1/g (Bjorn) > -- Rewrote commit msgs and comments refering panics if L1SS > is enabled/disabled; the code snippet that unadvertises L1SS > eliminates the panic scenario. (Bjorn) > > v2 -- Changed binding property 'brcm,completion-timeout-msec' to > 'brcm,completion-timeout-us'. (StefanW for standard suffix). > -- Warn when clamping timeout value, and include clamped > region in message. Also add min and max in YAML. (StefanW) > -- Qualify description of "brcm,completion-timeout-us" so that > it refers to PCIe transactions. (StefanW) > -- Remvove mention of Linux specifics in binding description. (StefanW) > -- s/clkreq#/CLKREQ#/g (Bjorn) > -- Refactor completion-timeout-us code to compare max and min to > value given by the property (as opposed to the computed value). > > v1 -- The current driver assumes the downstream devices can > provide CLKREQ# for ASPM. These commits accomodate devices > w/ or w/o clkreq# and also handle L1SS-capable devices. > > -- The Raspian Linux folks have already been using a PCIe RC > property "brcm,enable-l1ss". These commits use the same > property, in a backward-compatible manner, and the implementaion > adds more detail and also automatically identifies devices w/o > a clkreq# signal, i.e. most devices plugged into an RPi CM4 > IO board. For the entire series: Tested-by: Florian Fainelli <florian.fainelli@broadcom.com> on all of my available devices: - SUNIX Co., Ltd. Multiport serial controller - Broadcom BCM4331 Wi-Fi - Broadcom BCM43224 Wi-Fi - Broadcom BCM4322 Wi-Fi - Qualcomm Atheros AR5008 - Broadcom BCM4366 Wi-Fi - Marvell Technology Group Ltd. 88SE9125 PCIe SATA 6.0 Gb/s controller - Intel 7260 Wi-Fi - Intel Corporation 82574L Gigabit Network Connection - Broadcom NetXtreme BCM5751 Gigabit Ethernet - Pepperl+Fuchs RocketPort EXPRESS 8-port w/Octa Cable - Micron/Crucial Technology P2 NVMe PCIe SSD - ASM1184e PCIe Switch Port
v7 -- Manivannan Sadhasivam suggested (a) making the property look like a network phy-mode and (b) keeping the code simple (not counting clkreq signal appearances, un-advertising capabilites, etc). This is what I have done. The property is now "brcm,clkreq-mode" and the values may be one of "safe", "default", and "no-l1ss". The default setting is to employ the most capable power savings mode. v6 -- No code has been changed. -- Changed commit subject and comment in "#PERST" commit (Bjorn, Cyril) -- Changed sign-off and author email address for all commits. This was due to a change in Broadcom's upstreaming policy. v5 -- Remove DT property "brcm,completion-timeout-us" from "DT bindings" commit. Although this error may be reported as a completion timeout, its cause was traced to an internal bus timeout which may occur even when there is no PCIe access being processed. We set a timeout of four seconds only if we are operating in "L1SS CLKREQ#" mode. -- Correct CEM 2.0 reference provided by HW engineer, s/3.2.5.2.5/3.2.5.2.2/ (Bjorn) -- Add newline to dev_info() string (Stefan) -- Change variable rval to unsigned (Stefan) -- s/implementaion/implementation/ (Bjorn) -- s/superpowersave/powersupersave/ (Bjorn) -- Slightly modify message on "PERST#" commit. -- Rebase to torvalds master v4 -- New commit that asserts PERST# for 2711/RPi SOCs at PCIe RC driver probe() time. This is done in Raspian Linux and its absence may be the cause of a failing test case. -- New commit that removes stale comment. v3 -- Rewrote commit msgs and comments refering panics if L1SS is enabled/disabled; the code snippet that unadvertises L1SS eliminates the panic scenario. (Bjorn) -- Add reference for "400ns of CLKREQ# assertion" blurb (Bjorn) -- Put binding names in DT commit Subject (Bjorn) -- Add a verb to a commit's subject line (Bjorn) -- s/accomodat(\w+)/accommodat$1/g (Bjorn) -- Rewrote commit msgs and comments refering panics if L1SS is enabled/disabled; the code snippet that unadvertises L1SS eliminates the panic scenario. (Bjorn) v2 -- Changed binding property 'brcm,completion-timeout-msec' to 'brcm,completion-timeout-us'. (StefanW for standard suffix). -- Warn when clamping timeout value, and include clamped region in message. Also add min and max in YAML. (StefanW) -- Qualify description of "brcm,completion-timeout-us" so that it refers to PCIe transactions. (StefanW) -- Remvove mention of Linux specifics in binding description. (StefanW) -- s/clkreq#/CLKREQ#/g (Bjorn) -- Refactor completion-timeout-us code to compare max and min to value given by the property (as opposed to the computed value). v1 -- The current driver assumes the downstream devices can provide CLKREQ# for ASPM. These commits accomodate devices w/ or w/o clkreq# and also handle L1SS-capable devices. -- The Raspian Linux folks have already been using a PCIe RC property "brcm,enable-l1ss". These commits use the same property, in a backward-compatible manner, and the implementaion adds more detail and also automatically identifies devices w/o a clkreq# signal, i.e. most devices plugged into an RPi CM4 IO board. Jim Quinlan (3): dt-bindings: PCI: brcmstb: Add property "brcm,clkreq-mode" PCI: brcmstb: Configure HW CLKREQ# mode appropriate for downstream device PCI: brcmstb: Set higher value for internal bus timeout .../bindings/pci/brcm,stb-pcie.yaml | 21 +++++ drivers/pci/controller/pcie-brcmstb.c | 81 ++++++++++++++++--- 2 files changed, 92 insertions(+), 10 deletions(-) base-commit: 305230142ae0637213bf6e04f6d9f10bbcb74af8