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Wed, 05 Nov 2025 02:28:35 -0800 (PST) X-Google-Smtp-Source: AGHT+IG0nab8d2/HqREAsJ22farB7T8O/NtwdkVq1ttqTloYL9Mn4A21uAb5ZKhKlMroMgSfVGcy9g== X-Received: by 2002:a17:90b:2e04:b0:341:6164:c27d with SMTP id 98e67ed59e1d1-341a6bfbc5cmr2752065a91.3.1762338514552; Wed, 05 Nov 2025 02:28:34 -0800 (PST) Received: from [10.217.219.207] ([202.46.22.19]) by smtp.gmail.com with ESMTPSA id d2e1a72fcca58-7acd324680asm5909209b3a.1.2025.11.05.02.28.30 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Wed, 05 Nov 2025 02:28:34 -0800 (PST) Message-ID: <77031db5-a94e-49c3-b48f-5f7a5569d1a2@oss.qualcomm.com> Date: Wed, 5 Nov 2025 15:58:28 +0530 Precedence: bulk X-Mailing-List: linux-media@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH] i2c: qcom-geni: make sure I2C hub controllers can't use SE DMA To: Konrad Dybcio , Neil Armstrong , Viken Dadhaniya , Andi Shyti , Sumit Semwal , =?UTF-8?Q?Christian_K=C3=B6nig?= , Wolfram Sang , Konrad Dybcio Cc: linux-arm-msm@vger.kernel.org, linux-i2c@vger.kernel.org, linux-kernel@vger.kernel.org, linux-media@vger.kernel.org, dri-devel@lists.freedesktop.org, linaro-mm-sig@lists.linaro.org References: <20251029-topic-sm8x50-geni-i2c-hub-no-dma-v1-1-5e264258a5bd@linaro.org> <49f067c0-20d3-4039-95e6-fc19ce48881d@oss.qualcomm.com> Content-Language: en-US From: Mukesh Savaliya In-Reply-To: <49f067c0-20d3-4039-95e6-fc19ce48881d@oss.qualcomm.com> Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit X-Proofpoint-Spam-Details-Enc: AW1haW4tMjUxMTA1MDA3NyBTYWx0ZWRfX3v57fR2hRJD5 Acq72NRwIWVjtH4n+RRRDdBMZI/ajiB0qoWYzq7CK407fip0kaCzNl5+wQhjTDxQij5lkRpZXS9 zg8mpQcqREgyzGpRztoCCavnWB8werBNP9NvnLM8kKnLZCtk7vLsj/ImRoKJlqJeETixTXy0GyF cIV0r8uLqO8H6Bq676hULO64kkbGoTokFM1T7PkCRX7DmPA/UjuNv0sIAkDFQBogy5UWtieSAFf Ui/IxmOsP7i5xQQIqTdHb0Km6GA+2dDMxySk4P7+GVH+jU+J49lycZRohF9soPXvO+YDvX9FMNO SkFfi36PqAkU4UZUaHBEf50P2GnsuuG/6qE/zFmWNQOPBpOin+7UTuBvbm0w/0b5Y8gSeyPFZHx USpiACp8HjBdtUjRfmqZN9raUm5FTQ== X-Proofpoint-GUID: dvX796B2Q_rzgpdy_gL84kUFT0dMuHfB X-Authority-Analysis: v=2.4 cv=IdSKmGqa c=1 sm=1 tr=0 ts=690b26d4 cx=c_pps a=RP+M6JBNLl+fLTcSJhASfg==:117 a=fChuTYTh2wq5r3m49p7fHw==:17 a=IkcTkHD0fZMA:10 a=6UeiqGixMTsA:10 a=s4-Qcg_JpJYA:10 a=VkNPw1HP01LnGYTKEx00:22 a=KKAkSRfTAAAA:8 a=EUspDBNiAAAA:8 a=wCNI2q6YBtXYwDTL9A4A:9 a=QEXdDO2ut3YA:10 a=iS9zxrgQBfv6-_F4QbHw:22 a=cvBusfyB2V15izCimMoJ:22 X-Proofpoint-ORIG-GUID: dvX796B2Q_rzgpdy_gL84kUFT0dMuHfB 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=2025-11-05_04,2025-11-03_03,2025-10-01_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 malwarescore=0 phishscore=0 clxscore=1015 adultscore=0 priorityscore=1501 lowpriorityscore=0 bulkscore=0 impostorscore=0 suspectscore=0 spamscore=0 classifier=typeunknown authscore=0 authtc= authcc= route=outbound adjust=0 reason=mlx scancount=1 engine=8.22.0-2510240001 definitions=main-2511050077 On 10/30/2025 2:56 PM, Konrad Dybcio wrote: > On 10/29/25 7:07 PM, Neil Armstrong wrote: >> The I2C Hub controller is a simpler GENI I2C variant that doesn't >> support DMA at all, add a no_dma flag to make sure it nevers selects >> the SE DMA mode with mappable 32bytes long transfers. >> >> Fixes: cacd9643eca7 ("i2c: qcom-geni: add support for I2C Master Hub variant") >> Signed-off-by: Neil Armstrong >> --- >> drivers/i2c/busses/i2c-qcom-geni.c | 11 +++++++---- >> 1 file changed, 7 insertions(+), 4 deletions(-) >> >> diff --git a/drivers/i2c/busses/i2c-qcom-geni.c b/drivers/i2c/busses/i2c-qcom-geni.c >> index 43fdd89b8beb..bfb352b04902 100644 >> --- a/drivers/i2c/busses/i2c-qcom-geni.c >> +++ b/drivers/i2c/busses/i2c-qcom-geni.c >> @@ -97,6 +97,7 @@ struct geni_i2c_dev { >> dma_addr_t dma_addr; >> struct dma_chan *tx_c; >> struct dma_chan *rx_c; >> + bool no_dma; >> bool gpi_mode; >> bool abort_done; >> }; >> @@ -425,7 +426,7 @@ static int geni_i2c_rx_one_msg(struct geni_i2c_dev *gi2c, struct i2c_msg *msg, >> size_t len = msg->len; >> struct i2c_msg *cur; >> >> - dma_buf = i2c_get_dma_safe_msg_buf(msg, 32); >> + dma_buf = gi2c->no_dma ? NULL : i2c_get_dma_safe_msg_buf(msg, 32); > > Not a huge fan of putting the ternary operator here, but I don't > mind that much either > > Reviewed-by: Konrad Dybcio Reviewed-by: Mukesh Kumar Savaliya > > Konrad