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Tue, 21 Jul 2026 07:58:23 -0700 (PDT) Received: from QCOM-eG0v1AUPpu.na.qualcomm.com ([2a01:e0a:830:450:751c:d61c:c91:60dd]) by smtp.gmail.com with ESMTPSA id 4fb4d7f45d1cf-69e6ffbba0fsm5875369a12.17.2026.07.21.07.58.20 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 21 Jul 2026 07:58:21 -0700 (PDT) From: Loic Poulain Subject: [PATCH 0/3] i2c: qcom-cci: Fix CCI clock rate enforcement Date: Tue, 21 Jul 2026 16:58:18 +0200 Message-Id: <20260721-cci-clk-fix-v1-0-5eae78700da8@oss.qualcomm.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 7bit X-B4-Tracking: v=1; b=H4sIAAqJX2oC/x2MQQqAIBAAvxJ7bkGlEvpKdLBtraWwUIhA/HvSc QZmMiSOwgnGJkPkR5JcoYJuG6DdhY1R1spglBmUNRqJBOk80MuLnnXXL8aRdxZqcUeu+r9Ncyk f0mcvzl0AAAA= X-Change-ID: 20260721-cci-clk-fix-fe145b2acfa7 To: Robert Foss , Andi Shyti , Wolfram Sang , Dmitry Baryshkov , Luca Weiss Cc: linux-i2c@vger.kernel.org, linux-arm-msm@vger.kernel.org, linux-kernel@vger.kernel.org, Loic Poulain X-Mailer: b4 0.14.2 X-Proofpoint-Spam-Details-Enc: AW1haW4tMjYwNzIxMDE1OCBTYWx0ZWRfX8rC2K7tAf625 +mnNFrAAZyn5o1nC3TCDjQGVqE0L8fWTUNWGFqppVV2tfpXeLrAeF+YFnAMkNMRM9oBB6bHuY5J xVC2jrp3upK7U07l+6mOSMD5pHxt/ePO9Ygc7KqzKS8LHx+H1E6wGbbgt/mTitA/x/3aazgwVLG Nq0kZAY4tT9hUxyo+9ErLsq3VszCPFgf2zhu/SGPJTjdtXZzSq35m0fhcTSBAOZkRQ4sj1qLgEJ +I9qjerxD70qY4hgPkViaZ9c7Wds/WGWGoTBM1iARHG+BHN1JfDQDOeEoH8E4FNmaaOEC4Y4FkV UfGvBT6Z7q18Tn4eAbO00MAu1xsTJsLwoQ3fPbiIxOBPX9X+sp3I9LH5cRDlaMr1cKlje7dKTZ/ bvNTi32xHo82te5Nx/qtmPDeyVNlXHf1HXcZlbvU2w3Z/qOG+VRn6AKwYoQhOWjSfGFa4kVNCLc II4LOUKBVEJjHq4ST6A== X-Proofpoint-Spam-Info: AW1haW4tMjYwNzIxMDE1OCBTYWx0ZWRfXyu9HXoQOYu4m ZCpT8i1xM5s4SvowkPkxG/nEqVWcPV0OBhtW3KApH7M0P37ID8IorOEGWfetjhpLqYx1W+WI2KP CKp3/UpNkZEcpPbmJFgQjWMoCYsQZ98= X-Authority-Analysis: v=2.4 cv=DoFmPm/+ c=1 sm=1 tr=0 ts=6a5f8914 cx=c_pps a=JbAStetqSzwMeJznSMzCyw==:117 a=xqWC_Br6kY4A:10 a=IkcTkHD0fZMA:10 a=RAioF0-LDSMA:10 a=s4-Qcg_JpJYA:10 a=VkNPw1HP01LnGYTKEx00:22 a=u7WPNUs3qKkmUXheDGA7:22 a=YMgV9FUhrdKAYTUUvYB2:22 a=EUspDBNiAAAA:8 a=PiiRB4L06hF8XXeOMdIA:9 a=QEXdDO2ut3YA:10 a=uxP6HrT_eTzRwkO_Te1X:22 X-Proofpoint-GUID: NzHol8T0EKcTDTMmc_i4504wL-oAdPOL X-Proofpoint-ORIG-GUID: NzHol8T0EKcTDTMmc_i4504wL-oAdPOL X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.293,Aquarius:18.0.1143,Hydra:6.1.134,FMLib:17.12.100.49 definitions=2026-07-21_03,2026-07-20_03,2025-10-01_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 adultscore=0 malwarescore=0 lowpriorityscore=0 clxscore=1015 phishscore=0 suspectscore=0 impostorscore=0 bulkscore=0 priorityscore=1501 spamscore=0 classifier=typeunknown authscore=0 authtc= authcc= route=outbound adjust=0 reason=mlx scancount=1 engine=8.22.0-2606150000 definitions=main-2607210158 The CCI hw_params timing values (thigh, tlow, etc.) are expressed in clock ticks and were calibrated for a specific CCI clock frequency per hardware variant (19.2 MHz for v1/v1.5/msm8953, 37.5 MHz for v2). Running at the wrong frequency causes incorrect I2C timings that may violate the I2C specification. A previous series removed the cci_clk_rate field and the associated warning from the driver on the grounds that the warning was noisy and the rate was already set via assigned-clock-rates in the DT. However, enforcing a clock frequency configuration through DT is fragile and not the right approach, the driver owns the hw_params and should own the clock rate too. This series reverts the removal of cci_clk_rate, fixes the missing rate for the msm8953 variant (added after the field was removed), and replaces the passive warn-only approach with an active clk_set_rate() at probe time, retaining the warning for cases where the rate cannot be applied. Signed-off-by: Loic Poulain --- Loic Poulain (3): Revert "i2c: qcom-cci: Remove unused struct member cci_clk_rate" i2c: qcom-cci: Add missing cci_clk_rate for msm8953 i2c: qcom-cci: Fix CCI clock rate enforcement drivers/i2c/busses/i2c-qcom-cci.c | 15 +++++++++++++++ 1 file changed, 15 insertions(+) --- base-commit: fce2dfa773ced15f27dd27cd0b482a7473cdcf2a change-id: 20260721-cci-clk-fix-fe145b2acfa7 Best regards, -- Loic Poulain