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[78.88.45.245]) by smtp.gmail.com with ESMTPSA id 38308e7fff4ca-382eb3a02e3sm45306481fa.10.2026.01.13.03.13.07 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Tue, 13 Jan 2026 03:13:08 -0800 (PST) Message-ID: Date: Tue, 13 Jan 2026 12:13:05 +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 v10 4/7] qcom-tgu: Add TGU decode support To: Songwei Chai , andersson@kernel.org, alexander.shishkin@linux.intel.com, mike.leach@linaro.org, suzuki.poulose@arm.com, james.clark@arm.com, krzk+dt@kernel.org, conor+dt@kernel.org Cc: linux-kernel@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-arm-msm@vger.kernel.org, coresight@lists.linaro.org, devicetree@vger.kernel.org, gregkh@linuxfoundation.org References: <20260109021141.3778421-1-songwei.chai@oss.qualcomm.com> <20260109021141.3778421-5-songwei.chai@oss.qualcomm.com> Content-Language: en-US From: Konrad Dybcio In-Reply-To: <20260109021141.3778421-5-songwei.chai@oss.qualcomm.com> Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 7bit X-Authority-Analysis: v=2.4 cv=BYXVE7t2 c=1 sm=1 tr=0 ts=696628c6 cx=c_pps a=hnmNkyzTK/kJ09Xio7VxxA==:117 a=FpWmc02/iXfjRdCD7H54yg==:17 a=IkcTkHD0fZMA:10 a=vUbySO9Y5rIA:10 a=s4-Qcg_JpJYA:10 a=VkNPw1HP01LnGYTKEx00:22 a=EUspDBNiAAAA:8 a=CBdMip5UwVPz19tR0hoA:9 a=QEXdDO2ut3YA:10 a=PEH46H7Ffwr30OY-TuGO:22 X-Proofpoint-ORIG-GUID: MEQ7RuKXcfYkm4WNXy18EzzMIsGdGMQX X-Proofpoint-GUID: MEQ7RuKXcfYkm4WNXy18EzzMIsGdGMQX X-Proofpoint-Spam-Details-Enc: AW1haW4tMjYwMTEzMDA5NSBTYWx0ZWRfX0ISoK5I02WKz yqVd/ScBKJbqiG/PJC2A24VkFasIdF3oKxgkZClXJG7GiJwB2I0qrZP/cCkvz4p5TOZtTpk4+3z Snm7NdNbJkyH1Z+4eiCcpom5zhf3YhZ8nJvFpg4MlX8eOl46RYAfh/0AAPAmyiEkybnNtv6yBZY H8zXJ1S9uJVkQL1ap1X2+ya2McL2BeswgrPzCA0YzJjGa63F4Wfg7909WbFQVu1XrJnW82xGk0L nXpioq6MQKBxWM/TvDG20mCHGtaR6mQb0X/MV+Uf0Yk1L6pMSN03UAcfT+h8dO5jAHA8GOwNwK0 x2q4x85q0sdSif25oBP56TkRVJRC7mFADYgLdy32tlLy+JKOPGcqfr0i20dtOibujUQV0HgEatH 9DLwVfVYdJNxrrH312ebWtOjFsXpRVBzJLX3dwHBblNdgu7a8/RlGEn8TPOMTEk7xGklkezFAe7 tq2+E+mgkvVmlwie5hw== X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.293,Aquarius:18.0.1121,Hydra:6.1.9,FMLib:17.12.100.49 definitions=2026-01-13_02,2026-01-09_02,2025-10-01_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 adultscore=0 lowpriorityscore=0 bulkscore=0 phishscore=0 impostorscore=0 spamscore=0 malwarescore=0 clxscore=1015 priorityscore=1501 suspectscore=0 classifier=typeunknown authscore=0 authtc= authcc= route=outbound adjust=0 reason=mlx scancount=1 engine=8.22.0-2512120000 definitions=main-2601130095 On 1/9/26 3:11 AM, Songwei Chai wrote: > Decoding is when all the potential pieces for creating a trigger > are brought together for a given step. Example - there may be a > counter keeping track of some occurrences and a priority-group that > is being used to detect a pattern on the sense inputs. These 2 > inputs to condition_decode must be programmed, for a given step, > to establish the condition for the trigger, or movement to another > steps. > > Signed-off-by: Songwei Chai > --- [...] > @@ -18,8 +18,36 @@ static int calculate_array_location(struct tgu_drvdata *drvdata, > int step_index, int operation_index, > int reg_index) > { > - return operation_index * (drvdata->max_step) * (drvdata->max_reg) + > - step_index * (drvdata->max_reg) + reg_index; I think this type of calculations could use a wrapper > + int ret = -EINVAL; > + > + switch (operation_index) { > + case TGU_PRIORITY0: > + case TGU_PRIORITY1: > + case TGU_PRIORITY2: > + case TGU_PRIORITY3: > + ret = operation_index * (drvdata->max_step) * > + (drvdata->max_reg) + > + step_index * (drvdata->max_reg) + reg_index; > + break; > + case TGU_CONDITION_DECODE: > + ret = step_index * (drvdata->max_condition_decode) + > + reg_index; > + break; > + default: > + break; > + } > + return ret; The only thing your switch statement is assign a value to ret and break out. Change that to a direct return, and drop 'ret' altogether > +} > + > +static int check_array_location(struct tgu_drvdata *drvdata, int step, > + int ops, int reg) > +{ > + int result = calculate_array_location(drvdata, step, ops, reg); > + > + if (result == -EINVAL) > + dev_err(drvdata->dev, "%s - Fail\n", __func__); Avoid __func__. The error message is very non-descriptive [...] > static int tgu_enable(struct device *dev) > { > struct tgu_drvdata *drvdata = dev_get_drvdata(dev); > + int ret = 0; > > guard(spinlock)(&drvdata->lock); > if (drvdata->enable) > return -EBUSY; > > - tgu_write_all_hw_regs(drvdata); > + ret = tgu_write_all_hw_regs(drvdata); > + > + if (ret == -EINVAL) stray \n > + goto exit; > + > drvdata->enable = true; > > - return 0; > +exit: > + return ret; ret = tgu_write_all_hw_regs(drvdata); if (!ret) drvdata->enable = true; return ret Konrad