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[144.178.202.139]) by smtp.gmail.com with ESMTPSA id a640c23a62f3a-ae6e7e90c70sm259816466b.13.2025.07.11.00.43.46 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Fri, 11 Jul 2025 00:43:46 -0700 (PDT) Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: Mime-Version: 1.0 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset=UTF-8 Date: Fri, 11 Jul 2025 09:43:46 +0200 Message-Id: Cc: , , , Subject: Re: [PATCH v2 3/5] drm/sysfb: simpledrm: Add support for interconnect paths From: "Luca Weiss" To: "Javier Martinez Canillas" , "Hans de Goede" , "Maarten Lankhorst" , "Maxime Ripard" , "Thomas Zimmermann" , "David Airlie" , "Simona Vetter" , "Rob Herring" , "Krzysztof Kozlowski" , "Conor Dooley" , "Helge Deller" X-Mailer: aerc 0.20.1-0-g2ecb8770224a-dirty References: <20250623-simple-drm-fb-icc-v2-0-f69b86cd3d7d@fairphone.com> <20250623-simple-drm-fb-icc-v2-3-f69b86cd3d7d@fairphone.com> <87qzz5d3le.fsf@minerva.mail-host-address-is-not-set> In-Reply-To: <87qzz5d3le.fsf@minerva.mail-host-address-is-not-set> Hi Javier, On Fri Jun 27, 2025 at 9:51 AM CEST, Javier Martinez Canillas wrote: > Luca Weiss writes: > >> Some devices might require keeping an interconnect path alive so that >> the framebuffer continues working. Add support for that by setting the >> bandwidth requirements appropriately for all provided interconnect >> paths. >> >> Reviewed-by: Thomas Zimmermann >> Signed-off-by: Luca Weiss >> --- >> drivers/gpu/drm/sysfb/simpledrm.c | 83 ++++++++++++++++++++++++++++++++= +++++++ >> 1 file changed, 83 insertions(+) >> >> diff --git a/drivers/gpu/drm/sysfb/simpledrm.c b/drivers/gpu/drm/sysfb/s= impledrm.c >> index 349219330314e3421a6bb26ad5cf39a679a5cb7a..47d213e20cab1dd1e1952867= 4a95edea00f4bb30 100644 >> --- a/drivers/gpu/drm/sysfb/simpledrm.c >> +++ b/drivers/gpu/drm/sysfb/simpledrm.c >> @@ -2,6 +2,7 @@ >> =20 >> #include >> #include >> +#include >> #include >> #include >> #include >> @@ -225,6 +226,10 @@ struct simpledrm_device { >> struct device **pwr_dom_devs; >> struct device_link **pwr_dom_links; >> #endif > > Can you add a /* interconnects */ comment here? Similarly how there is on= e > for clocks, regulators, power domains, etc. Sure! > >> +#if defined CONFIG_OF && defined CONFIG_INTERCONNECT >> + unsigned int icc_count; >> + struct icc_path **icc_paths; >> +#endif >> =20 > > ... > >> +static int simpledrm_device_attach_icc(struct simpledrm_device *sdev) >> +{ >> + struct device *dev =3D sdev->sysfb.dev.dev; >> + int ret, count, i; >> + >> + count =3D of_count_phandle_with_args(dev->of_node, "interconnects", >> + "#interconnect-cells"); >> + if (count < 0) >> + return 0; >> + >> + /* An interconnect path consists of two elements */ >> + if (count % 2) { >> + drm_err(&sdev->sysfb.dev, >> + "invalid interconnects value\n"); >> + return -EINVAL; >> + } >> + sdev->icc_count =3D count / 2; >> + >> + sdev->icc_paths =3D devm_kcalloc(dev, sdev->icc_count, >> + sizeof(*sdev->icc_paths), >> + GFP_KERNEL); >> + if (!sdev->icc_paths) >> + return -ENOMEM; >> + >> + for (i =3D 0; i < sdev->icc_count; i++) { >> + sdev->icc_paths[i] =3D of_icc_get_by_index(dev, i); >> + if (IS_ERR_OR_NULL(sdev->icc_paths[i])) { >> + ret =3D PTR_ERR(sdev->icc_paths[i]); >> + if (ret =3D=3D -EPROBE_DEFER) >> + goto err; >> + drm_err(&sdev->sysfb.dev, "failed to get interconnect path %u: %d\n"= , >> + i, ret); > > You could use dev_err_probe() instead that already handles the -EPROBE_DE= FER > case and also will get this message in the /sys/kernel/debug/devices_defe= rred > debugfs entry, as the reason why the probe deferral happened. Not quite sure how to implement dev_err_probe, but I think this should be quite okay? if (IS_ERR_OR_NULL(sdev->icc_paths[i])) { ret =3D dev_err_probe(dev, PTR_ERR(sdev->icc_paths[i]), "failed to get interconnect path %u\n", i); if (ret =3D=3D -EPROBE_DEFER) goto err; continue; } That would still keep the current behavior for defer vs permanent error while printing when necessary and having it for devices_deferred for the defer case. Not sure what the difference between drm_err and dev_err are, but I trust you on that. Let me know. Regards Luca > > Reviewed-by: Javier Martinez Canillas