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[62.151.111.63]) by smtp.gmail.com with ESMTPSA id ffacd0b85a97d-3a892e5f44dsm1931370f8f.87.2025.06.27.00.56.21 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Fri, 27 Jun 2025 00:56:21 -0700 (PDT) From: Javier Martinez Canillas To: Luca Weiss , Hans de Goede , Maarten Lankhorst , Maxime Ripard , Thomas Zimmermann , David Airlie , Simona Vetter , Rob Herring , Krzysztof Kozlowski , Conor Dooley , Helge Deller Cc: linux-fbdev@vger.kernel.org, dri-devel@lists.freedesktop.org, devicetree@vger.kernel.org, linux-kernel@vger.kernel.org, Luca Weiss Subject: Re: [PATCH v2 5/5] fbdev/simplefb: Add support for interconnect paths In-Reply-To: <20250623-simple-drm-fb-icc-v2-5-f69b86cd3d7d@fairphone.com> References: <20250623-simple-drm-fb-icc-v2-0-f69b86cd3d7d@fairphone.com> <20250623-simple-drm-fb-icc-v2-5-f69b86cd3d7d@fairphone.com> Date: Fri, 27 Jun 2025 09:56:20 +0200 Message-ID: <87ldpdd3dn.fsf@minerva.mail-host-address-is-not-set> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain 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/video/fbdev/simplefb.c | 83 ++++++++++++++++++++++++++++++++++++++++++ > 1 file changed, 83 insertions(+) > [...] > +static void simplefb_detach_icc(void *res) > +{ > + struct simplefb_par *par = res; > + int i; > + > + for (i = par->icc_count - 1; i >= 0; i--) { > + if (!IS_ERR_OR_NULL(par->icc_paths[i])) > + icc_put(par->icc_paths[i]); > + } > +} > + > +static int simplefb_attach_icc(struct simplefb_par *par, > + struct platform_device *pdev) > +{ > + struct device *dev = &pdev->dev; > + int ret, count, i; > + > + count = 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) { > + dev_err(dev, "invalid interconnects value\n"); > + return -EINVAL; > + } > + par->icc_count = count / 2; > + > + par->icc_paths = devm_kcalloc(dev, par->icc_count, > + sizeof(*par->icc_paths), > + GFP_KERNEL); > + if (!par->icc_paths) > + return -ENOMEM; > + > + for (i = 0; i < par->icc_count; i++) { > + par->icc_paths[i] = of_icc_get_by_index(dev, i); > + if (IS_ERR_OR_NULL(par->icc_paths[i])) { > + ret = PTR_ERR(par->icc_paths[i]); > + if (ret == -EPROBE_DEFER) > + goto err; > + dev_err(dev, "failed to get interconnect path %u: %d\n", i, ret); > + continue; > + } > + > + ret = icc_set_bw(par->icc_paths[i], 0, UINT_MAX); > + if (ret) { > + dev_err(dev, "failed to set interconnect bandwidth %u: %d\n", i, ret); > + continue; > + } > + } > + > + return devm_add_action_or_reset(dev, simplefb_detach_icc, par); > + > +err: > + while (i) { > + --i; > + if (!IS_ERR_OR_NULL(par->icc_paths[i])) > + icc_put(par->icc_paths[i]); > + } > + return ret; > +} > +#else These two functions contain the same logic that you are using in the simpledrm driver. I wonder if could be made helpers so that the code isn't duplicated in both drivers. But in any case it could be a follow-up of your series I think. Reviewed-by: Javier Martinez Canillas -- Best regards, Javier Martinez Canillas Core Platforms Red Hat