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[78.88.45.245]) by smtp.gmail.com with ESMTPSA id a640c23a62f3a-aac0e5029f8sm1884602966b.0.2025.01.03.05.17.10 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Fri, 03 Jan 2025 05:17:11 -0800 (PST) Message-ID: <1db8780a-d7ff-4eb7-b6dd-835327e55d21@oss.qualcomm.com> Date: Fri, 3 Jan 2025 14:17:09 +0100 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH 2/2] clk: qcom: gcc-sm8550: Don't park the USB RCG at registration time To: Stephen Boyd , Bjorn Andersson , Konrad Dybcio , Stephen Boyd Cc: linux-kernel@vger.kernel.org, linux-arm-msm@vger.kernel.org, patches@lists.linux.dev, linux-clk@vger.kernel.org, Taniya Das , Amit Pundir References: <20240819233628.2074654-1-swboyd@chromium.org> <20240819233628.2074654-3-swboyd@chromium.org> <1edc1fdb-ccf9-4dec-9669-d8c33511c7b0@kernel.org> Content-Language: en-US From: Konrad Dybcio In-Reply-To: Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 7bit X-Proofpoint-ORIG-GUID: eOl7_RjyqvweJfqaW2Ye-QVKMcjpdGMU X-Proofpoint-GUID: eOl7_RjyqvweJfqaW2Ye-QVKMcjpdGMU X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.293,Aquarius:18.0.1039,Hydra:6.0.680,FMLib:17.12.60.29 definitions=2024-09-06_09,2024-09-06_01,2024-09-02_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 spamscore=0 bulkscore=0 phishscore=0 lowpriorityscore=0 malwarescore=0 priorityscore=1501 mlxscore=0 suspectscore=0 impostorscore=0 adultscore=0 mlxlogscore=999 clxscore=1015 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.19.0-2411120000 definitions=main-2501030117 On 30.08.2024 7:59 PM, Stephen Boyd wrote: > Quoting Konrad Dybcio (2024-08-30 05:24:20) >> On 27.08.2024 8:12 PM, Stephen Boyd wrote: >>> Quoting Stephen Boyd (2024-08-19 16:36:27) >>>> Amit Pundir reports that audio and USB-C host mode stops working if the >>>> gcc_usb30_prim_master_clk_src clk is registered and >>>> clk_rcg2_shared_init() parks it on XO. Skip parking this clk at >>>> registration time to fix those issues. >>>> >>>> Partially revert commit 01a0a6cc8cfd ("clk: qcom: Park shared RCGs upon >>>> registration") by skipping the parking bit for this clk, but keep the >>>> part where we cache the config register. That's still necessary to >>>> figure out the true parent of the clk at registration time. >>>> >>>> Fixes: 01a0a6cc8cfd ("clk: qcom: Park shared RCGs upon registration") >>>> Fixes: 929c75d57566 ("clk: qcom: gcc-sm8550: Mark RCGs shared where applicable") >>>> Cc: Konrad Dybcio >>>> Cc: Bjorn Andersson >>>> Cc: Taniya Das >>>> Reported-by: Amit Pundir >>>> Closes: https://lore.kernel.org/CAMi1Hd1KQBE4kKUdAn8E5FV+BiKzuv+8FoyWQrrTHPDoYTuhgA@mail.gmail.com >>>> Signed-off-by: Stephen Boyd >>>> --- >>>> drivers/clk/qcom/clk-rcg.h | 1 + >>>> drivers/clk/qcom/clk-rcg2.c | 30 ++++++++++++++++++++++++++++++ >>>> drivers/clk/qcom/gcc-sm8550.c | 2 +- >>>> 3 files changed, 32 insertions(+), 1 deletion(-) >>>> >>>> diff --git a/drivers/clk/qcom/clk-rcg.h b/drivers/clk/qcom/clk-rcg.h >>>> index d7414361e432..8e0f3372dc7a 100644 >>>> --- a/drivers/clk/qcom/clk-rcg.h >>>> +++ b/drivers/clk/qcom/clk-rcg.h >>>> @@ -198,6 +198,7 @@ extern const struct clk_ops clk_byte2_ops; >>>> extern const struct clk_ops clk_pixel_ops; >>>> extern const struct clk_ops clk_gfx3d_ops; >>>> extern const struct clk_ops clk_rcg2_shared_ops; >>>> +extern const struct clk_ops clk_rcg2_shared_no_init_park_ops; >>> >>> I'm considering inverting these two rcg2_shared clk_ops so that only a >>> few clks are parked at clk registration time, to minimize the impact of >>> commit 01a0a6cc8cfd ("clk: qcom: Park shared RCGs upon registration"). >>> We're up to three or four band-aids, that we can probably wait on >>> applying if we make all the shared RCGs determine the correct parent at >>> registration time but skip the parking, except for the display clks on >>> sc7180 where that exposes another problem with shared parents getting >>> turned off during probe. It's possible that other SoCs will want to park >>> their display clks as well to avoid that secondary problem, but it can >>> be an opt-in case instead of a change to all shared RCGs. >> >> Are all cases that need the parking obvious like it was the case on 7180, >> i.e. some downstream branch is stuck and there's complaining in dmesg? >> > > I'm under the impression that we need to park the clk when it is shared > by a remoteproc/firmware or is associated with a GDSC. It seems that on > older generations of hardware the GDSC would get unstuck eventually, but > newer generations stay broken and cause all sorts of havoc. I heard newer GDSCs are funky.. > Note that in my statement earlier in this thread I'm talking about > parking the clk at registration time. That's done to avoid a problem > where a shared RCG turns off their parent PLL and another shared RCG is > also using that PLL but hasn't parked yet. The solution was to park at > registration time to fix that. It's mostly a workaround for the fact > that the clk framework doesn't have a good way to track dependencies for > all the child clks that are enable at registration time which want to > keep the parent PLL enabled. The problem is that it breaks things like > USB that has strict frequency requirements for the link. Should we just do something like .sync_state, where top-level parents aren't turned off until all clocks have been registered? Konrad