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Tue, 18 Aug 2026 03:08:39 -0700 (PDT) X-Received: by 2002:a05:620a:6846:b0:92e:5272:4e3e with SMTP id af79cd13be357-936d1f0a69cmr2252164385a.0.1787047719529; Tue, 18 Aug 2026 03:08:39 -0700 (PDT) Received: from [192.168.120.193] ([178.235.128.140]) by smtp.gmail.com with ESMTPSA id a640c23a62f3a-c2185bc60a2sm126710566b.56.2026.08.18.03.08.37 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Tue, 18 Aug 2026 03:08:38 -0700 (PDT) Message-ID: <070e30fb-a9c5-4685-8185-a5f19ed13693@oss.qualcomm.com> Date: Tue, 18 Aug 2026 12:08:36 +0200 Precedence: bulk X-Mailing-List: devicetree@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH 07/10] usb: chipidea: msm: do not force the TX FIFO idle on HSIC instances To: Dmitry Baryshkov , Bartosz Golaszewski , Bjorn Andersson , Linus Walleij , Rob Herring , Krzysztof Kozlowski , Conor Dooley , Greg Kroah-Hartman , Xu Yang , Peng Fan , Vinod Koul , Neil Armstrong , Peter Chen , Pavankumar Kondeti , Stephen Boyd , Konrad Dybcio Cc: Krzysztof Kozlowski , linux-arm-msm@vger.kernel.org, linux-gpio@vger.kernel.org, devicetree@vger.kernel.org, linux-kernel@vger.kernel.org, linux-usb@vger.kernel.org, linux-phy@lists.infradead.org, Greg Kroah-Hartman , Peter Chen References: <20260810-msm8974-usb-hsic-v1-0-e5f93ea76ffa@oss.qualcomm.com> <20260810-msm8974-usb-hsic-v1-7-e5f93ea76ffa@oss.qualcomm.com> Content-Language: en-US From: Konrad Dybcio In-Reply-To: <20260810-msm8974-usb-hsic-v1-7-e5f93ea76ffa@oss.qualcomm.com> Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 7bit X-Proofpoint-ORIG-GUID: pX68kze0V5IclYH7uVtVpPcGWI6hwVBG X-Proofpoint-Spam-Details-Enc: AW1haW4tMjYwODE4MDA3MyBTYWx0ZWRfX5X4/6FUvXqFN bmFu7LVuV7dURb4mrzuXaZDdhBrnBHv8lPXVVupjSFs/Ud86CpDeCs809y02CuLB4Q8/FMWGuWI pdN+34xfMizJdlo7B5SbCHcZdJWfhHN06x9EQ5Yy84i0XkwOsqUpeqZoSlg0jF/tPQ67yu+wcOi lpnG/jAmmF9FAzCYapLWvjcapCHNJhbYfwS0GdZLYr38y9uiZI12wswc31vqqSvJ2K0D9lVkiAQ +T5y+d3QnX9bFHhVFTPJd0nlfGhqarzHfqnBMyc7lCNqSrmV5PWJw1JsObiAU3+5DmDuGbdSWiY hWHkRWd7W3DFM2Y6f55JcCaejCACRHSmwkT2AOqUvMo2oLvYpgATsJd+sQwz5aMUn2F+kqTFiWk FJdwfExb2LcOy/4I88CEqoY/8KQTuSXR9DMzJFdkjdGyhceCBjOMpiLVAMGr265VXXadmfS+YZF k6KgvbsehG0EdD8iHAg== X-Authority-Analysis: v=2.4 cv=K/IS2SWI c=1 sm=1 tr=0 ts=6a842f28 cx=c_pps a=qKBjSQ1v91RyAK45QCPf5w==:117 a=PRfkaYvzSr8QmIIGAkY2Sg==:17 a=IkcTkHD0fZMA:10 a=Sv0fKeRqtYgA:10 a=s4-Qcg_JpJYA:10 a=VkNPw1HP01LnGYTKEx00:22 a=u7WPNUs3qKkmUXheDGA7:22 a=3WHJM1ZQz_JShphwDgj5:22 a=EUspDBNiAAAA:8 a=rJk912bZzWDh8y19x2MA:9 a=QEXdDO2ut3YA:10 a=NFOGd7dJGGMPyQGDc5-O:22 X-Proofpoint-Spam-Info: AW1haW4tMjYwODE4MDA3MyBTYWx0ZWRfX0YQC6omAoS5f rbFVJJ2GVntfVLvrVxHrf4qudgiDsV+1fHRCOYTP8Bud3G978NzPtSZa0pYuaxUWlOeeOR6xKUr myWaRyxAS/7u96B16KshYklUHpt5RRI= X-Proofpoint-GUID: pX68kze0V5IclYH7uVtVpPcGWI6hwVBG X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.293,Aquarius:18.0.1176,Hydra:6.1.134,FMLib:17.12.100.49 definitions=2026-08-17_04,2026-08-12_01,2025-10-01_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 malwarescore=0 suspectscore=0 clxscore=1015 impostorscore=0 lowpriorityscore=0 bulkscore=0 spamscore=0 priorityscore=1501 adultscore=0 phishscore=0 classifier=typeunknown authscore=0 authtc= authcc= route=outbound adjust=0 reason=mlx scancount=1 engine=8.22.0-2606150000 definitions=main-2608180073 On 8/10/26 5:42 PM, Dmitry Baryshkov wrote: > The controller reset handler unconditionally clears > GENCONFIG[TXFIFO_IDLE_FORCE_DIS] as a workaround for an RX buffer > collision issue. The vendor HSIC host driver never applies this > workaround on the HSIC instances and leaves the bit at its power-on > default (set), so clearing it makes the HSIC instance diverge from the > known-working configuration. > > Skip the workaround for HSIC instances, like the neighbouring > GENCONFIG_2 write already does. > > Fixes: 47654a162081 ("usb: chipidea: msm: Restore wrapper settings after reset") > Assisted-by: Claude:claude-fable-5 > Signed-off-by: Dmitry Baryshkov > --- > drivers/usb/chipidea/ci_hdrc_msm.c | 5 +++-- > 1 file changed, 3 insertions(+), 2 deletions(-) > > diff --git a/drivers/usb/chipidea/ci_hdrc_msm.c b/drivers/usb/chipidea/ci_hdrc_msm.c > index 9a9410a814e5..69be194f8e27 100644 > --- a/drivers/usb/chipidea/ci_hdrc_msm.c > +++ b/drivers/usb/chipidea/ci_hdrc_msm.c > @@ -108,8 +108,9 @@ static int ci_hdrc_msm_notify_event(struct ci_hdrc *ci, unsigned event) > hw_write_id_reg(ci, HS_PHY_AHB_MODE, 0xffffffff, 0x8); > > /* workaround for rx buffer collision issue */ > - hw_write_id_reg(ci, HS_PHY_GENCONFIG, > - HS_PHY_TXFIFO_IDLE_FORCE_DIS, 0); > + if (!msm_ci->hsic) > + hw_write_id_reg(ci, HS_PHY_GENCONFIG, > + HS_PHY_TXFIFO_IDLE_FORCE_DIS, 0); This patch seems not to match downstream, msm-3.10 sets it in both hsic and non-hsic drivers Konrad