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[78.88.45.245]) by smtp.gmail.com with ESMTPSA id a640c23a62f3a-bc55b17c5e0sm59970666b.11.2026.05.06.02.09.10 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Wed, 06 May 2026 02:09:11 -0700 (PDT) Message-ID: Date: Wed, 6 May 2026 11:09:09 +0200 Precedence: bulk X-Mailing-List: linux-arm-msm@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [RFT PATCH] clk: qcom: dispcc-x1e80100: Fix (possibly) dumping regmap To: Krzysztof Kozlowski , Bjorn Andersson , Michael Turquette , Stephen Boyd , Brian Masney , linux-arm-msm@vger.kernel.org, linux-clk@vger.kernel.org, linux-kernel@vger.kernel.org Cc: Daniel J Blueman References: <20260505152908.302097-2-krzysztof.kozlowski@oss.qualcomm.com> Content-Language: en-US From: Konrad Dybcio In-Reply-To: <20260505152908.302097-2-krzysztof.kozlowski@oss.qualcomm.com> Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 7bit X-Authority-Analysis: v=2.4 cv=fMMJG5ae c=1 sm=1 tr=0 ts=69fb0539 cx=c_pps a=R6oCqFB+Yf/t2GF8e0/dFg==:117 a=FpWmc02/iXfjRdCD7H54yg==:17 a=IkcTkHD0fZMA:10 a=NGcC8JguVDcA:10 a=s4-Qcg_JpJYA:10 a=VkNPw1HP01LnGYTKEx00:22 a=u7WPNUs3qKkmUXheDGA7:22 a=_glEPmIy2e8OvE2BGh3C:22 a=VwQbUJbxAAAA:8 a=pGLkceISAAAA:8 a=t9ty7G3lAAAA:8 a=EUspDBNiAAAA:8 a=5gz2zhOb4yTQFyCjkmAA:9 a=QEXdDO2ut3YA:10 a=TD8TdBvy0hsOASGTdmB-:22 a=CsAS6f0m0zARWR-uHzm3:22 X-Proofpoint-ORIG-GUID: Z3QXnGIf8HYOGxHGi530qld9BQHMdTJC X-Proofpoint-GUID: Z3QXnGIf8HYOGxHGi530qld9BQHMdTJC X-Proofpoint-Spam-Details-Enc: AW1haW4tMjYwNTA2MDA4OCBTYWx0ZWRfX5Ap6jlxVyvts I0MkW/K+6xwjM00ELmNkX/SI7wQh4fUj2Cbk1EMiKp4FCddHtGMKZ2WuRZYhpFmBJwwo4LEI3MO sdT/8UnDHUVb0K2v8auYpleIUWO344+hWTKn1z3zKDtTCc4jfkI1yopTic1Z1gxkdu6gq4wpPFT UpxkFMK4e0ZmDwkypA3kl5SLbNutJ/ui9kWEFLQEUsjlXFQ2/fxxHZx3CzYvtCeMh0bTF/YcgKu mIVNEZPwrKjkUZd8VvHUnJVhepxmlus5r2Dx7QQx6SLK1ROME13htcmTrrVpBu7pEyhmm3JxP+G pSbqU5kXmXC6c7y0zt9DZZ31UFjSPetlfvKT/wPYAymmD6g/fJYdiXcpxIUUVl5fo0enS1CEDcI terhrMpZMjIhEYSerSW1SusrN+UuUYf4x9P5ZkW8WWo4ce4vNtTRQwm2/jYwbu2Yu6JHapUyXkL LAOjQHeChOY5DC4XVpA== X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.293,Aquarius:18.0.1143,Hydra:6.1.51,FMLib:17.12.100.49 definitions=2026-05-05_03,2026-04-30_02,2025-10-01_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 adultscore=0 phishscore=0 priorityscore=1501 suspectscore=0 lowpriorityscore=0 bulkscore=0 impostorscore=0 spamscore=0 malwarescore=0 clxscore=1015 classifier=typeunknown authscore=0 authtc= authcc= route=outbound adjust=0 reason=mlx scancount=1 engine=8.22.0-2604200000 definitions=main-2605060088 On 5/5/26 5:29 PM, Krzysztof Kozlowski wrote: > Reading few registers at the end of the block (e.g. 0x10000, 0x10004) > might result in synchronous external abort, so limit the regmap to the > last readable register which allows dumping the regs for debugging. > > Reported-by: Daniel J Blueman > Closes: https://lore.kernel.org/r/CAMVG2su+V5fcZ9LOC0Qm3bpfnhpbmQdJackc7-RvfztDL_dajw@mail.gmail.com/ > Signed-off-by: Krzysztof Kozlowski > --- > > Not really tested, just idea based on sm8750 and datasheet/manual. Not a great explanation for a completely different SoC :P > > drivers/clk/qcom/dispcc-x1e80100.c | 2 +- > 1 file changed, 1 insertion(+), 1 deletion(-) > > diff --git a/drivers/clk/qcom/dispcc-x1e80100.c b/drivers/clk/qcom/dispcc-x1e80100.c > index aa7fd43969f9..575ba90d2070 100644 > --- a/drivers/clk/qcom/dispcc-x1e80100.c > +++ b/drivers/clk/qcom/dispcc-x1e80100.c > @@ -1634,7 +1634,7 @@ static const struct regmap_config disp_cc_x1e80100_regmap_config = { > .reg_bits = 32, > .reg_stride = 4, > .val_bits = 32, > - .max_register = 0x11008, > + .max_register = 0xf004, /* 0x10000, 0x10004 and maybe others are for TZ */ There's some trailing registers for debugcc but we normally access those via devmem anyway Reviewed-by: Konrad Dybcio Konrad