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Thu, 30 Jul 2026 09:40:37 -0700 (PDT) Message-ID: <38162447-df7e-4fbc-b438-b48181d10186@gmail.com> Date: Thu, 30 Jul 2026 12:40:22 -0400 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] crypto: qce - Remove driver To: Konrad Dybcio , Eric Biggers Cc: Konrad Dybcio , Greg Kroah-Hartman , Bartosz Golaszewski , linux-crypto@vger.kernel.org, Herbert Xu , linux-arm-msm@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org, Kuldeep Singh , Dmitry Baryshkov References: <20260724141414.GB1876@sol> <2026072455-subtly-prayer-0a8a@gregkh> <20260724150932.GA6763@sol> <2026072428-ungodly-outsource-b20c@gregkh> <20260724155144.GA2032@sol> <20260728152241.GA4281@quark> <15904301-fd03-45e5-b909-dfce52449726@kernel.org> <20260729145520.GA1702@sol> <50d9d0e4-28c9-42b6-8b71-e75682b4959c@oss.qualcomm.com> <20260729171850.GA4454@quark> Content-Language: en-US From: Demi Marie Obenour Autocrypt: addr=demiobenour@gmail.com; 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micalg=pgp-sha256; protocol="application/pgp-signature"; boundary="------------t0ihQmACXOEWelq02XhLBP1h" This is an OpenPGP/MIME signed message (RFC 4880 and 3156) --------------t0ihQmACXOEWelq02XhLBP1h Content-Type: multipart/mixed; boundary="------------2XlfptUy3V5rxBrmNjBlQbIv"; protected-headers="v1"; hp="clear" Message-ID: <38162447-df7e-4fbc-b438-b48181d10186@gmail.com> Date: Thu, 30 Jul 2026 12:40:22 -0400 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH] crypto: qce - Remove driver To: Konrad Dybcio , Eric Biggers Cc: Konrad Dybcio , Greg Kroah-Hartman , Bartosz Golaszewski , linux-crypto@vger.kernel.org, Herbert Xu , linux-arm-msm@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org, Kuldeep Singh , Dmitry Baryshkov References: <20260724141414.GB1876@sol> <2026072455-subtly-prayer-0a8a@gregkh> <20260724150932.GA6763@sol> <2026072428-ungodly-outsource-b20c@gregkh> <20260724155144.GA2032@sol> <20260728152241.GA4281@quark> <15904301-fd03-45e5-b909-dfce52449726@kernel.org> <20260729145520.GA1702@sol> <50d9d0e4-28c9-42b6-8b71-e75682b4959c@oss.qualcomm.com> <20260729171850.GA4454@quark> Content-Language: en-US From: Demi Marie Obenour Autocrypt: addr=demiobenour@gmail.com; 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charset=UTF-8 Content-Transfer-Encoding: quoted-printable On 7/30/26 07:15, Konrad Dybcio wrote: > On 7/29/26 7:18 PM, Eric Biggers wrote: >> On Wed, Jul 29, 2026 at 06:55:20PM +0200, Konrad Dybcio wrote: >>>>> Unfortunately removing it drains way more battery, because the buse= s >>>>> never hit sync_state and are kept at their maximum frequencies: >>>>> >>>>> [ 18.021823] qnoc-glymur interconnect-1: sync_state() pending due= to 1dfa000.crypto >>>>> [ 18.029605] qnoc-glymur 16e0000.interconnect: sync_state() pendi= ng due to 1dfa000.crypto >>>>> >>>>> (it transiently also pins DRAM and friends to max-freq which absolu= tely >>>>> kills battery life) >>>> >>>> Isn't that easily fixable by marking the node as "disabled" in the >>>> device tree, or even just deleting it entirely? >>> >>> Avoided? Yes. Fixed? No. The DT is valid but Linux can't deal with it= >>> [since the driver is gone] >> >> If needed we can keep a stub driver that just disables power and doesn= 't >> register anything with the crypto API. I can send a patch that does >> that. >=20 > I believe we (are going to) need something like that in the kernel > for similar cases, however I'd rather see this driver kept/reinstated > for the reasons Bartosz is arguing What about removing all of the code that actually does cryptography? The problem isn't that the driver can't be fixed, but that: 1. It requires additional maintenance, and not just by the driver maintainer. 2. Even if the driver never needed maintenance, the QCE is so slow, and the driver overhead so great, that the features currently exposed by the driver should never be used. As Eric pointed out, the future use-cases Bartosz mentions should be implemented by a driver that isn't in drivers/crypto. --=20 Sincerely, Demi Marie Obenour (she/her/hers) --------------2XlfptUy3V5rxBrmNjBlQbIv-- --------------t0ihQmACXOEWelq02XhLBP1h Content-Type: application/pgp-signature; name="OpenPGP_signature.asc" Content-Description: OpenPGP digital signature Content-Disposition: attachment; filename="OpenPGP_signature.asc" -----BEGIN PGP SIGNATURE----- iQIzBAEBCgAdFiEEopQtqVJW1aeuo9/sszaHOrMp8lMFAmprfoAACgkQszaHOrMp 8lMBZQ/9H6ZnMZ4uJsLXk8rgQwcjpwkvE2geQEnARvBDB6Iqj12QyxW9XwqYXuCI PfY3jgcYXQKXKQ+ym1t9Gzxp7cJSbofZaF9gEbem32oWVr6y/i77jmo+rXfnnfLb bQzaRIx/6iVWvonQBG2zpNfcxN7FlWCWo2pb66X/S/NcSQIOtzDaOnU7K+uYGper UVdhLsmoKl05OI1YOyQblE2dTyIAHGwEfpBOdxyIU1zxLZEnXSXsrJ9k4EUbH8WG rSKbgOi2Z2ShTMb0KtopbDRvRvq3f4OltTP/esti0Zl42zrq9rQCTiHb9hU2KDFc w8/KBdFUUj3J3vX7h56NiLtNEdONy5bECFf3WdlD90Q6ljA+wJTONcDM0Ltf9Lqb RXXmVu17gzQGPKndNezR9Hry/h120dMAuh6MYSQdtbgSqMonOr64BinIABvJPq4B 2kyOatWo/Cl6J3ZRdAB57B0QGeOloazN/RtorcAY53ahQND16k3KXSWE47gd62lI 3VEF6pxF0Mn9MDCcgj6ZBgAnnzAUMSN2Vt9j+diV4hD+gKAsWVtjd6HEAyDpBonF crI6EV9BI64v+xjL9mEv8uaMmSW6T6M3Fd90HcO/o1p7css3J2LZhCUD+rKQzaHC DonTImuEaFapgVYepstb5q9eWIEb+mhH+k6UMeQQ16jEJWa/63A= =zInT -----END PGP SIGNATURE----- --------------t0ihQmACXOEWelq02XhLBP1h--