From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from gabe.freedesktop.org (gabe.freedesktop.org [131.252.210.177]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id F151BF459FC for ; Fri, 10 Apr 2026 18:13:02 +0000 (UTC) Received: from gabe.freedesktop.org (localhost [127.0.0.1]) by gabe.freedesktop.org (Postfix) with ESMTP id 5F3CB10E9B3; Fri, 10 Apr 2026 18:13:02 +0000 (UTC) Authentication-Results: gabe.freedesktop.org; dkim=pass (2048-bit key; unprotected) header.d=collabora.com header.i=@collabora.com header.b="jgvOqPm0"; dkim-atps=neutral Received: from bali.collaboradmins.com (bali.collaboradmins.com [148.251.105.195]) by gabe.freedesktop.org (Postfix) with ESMTPS id 8721010E9B3 for ; Fri, 10 Apr 2026 18:13:01 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=collabora.com; s=mail; t=1775844779; bh=GudaAA04Q6Phn5HgMsk92DFhafNOQ7lz4tFrsIJSSGA=; h=Date:From:To:Cc:Subject:In-Reply-To:References:From; b=jgvOqPm0qh3aTJApzekLnj0qbkqgsDYP7QRfGqsGwaNhIhNGEd03bx8HLx5oc4hg/ 490ACzU5CxXX63mS3sa0ffIXftlBDnx51LxQjFWg3tVb7x4Zaz32IfAVYTmfypYW0w eyfbcmwI2sANHxslP7U7MgW5WQ7MrQGAmMOgiHHFGXOZ11ZsxljVYxmh0/KVzEJKux LnjlWQGepKLyc9bzj1QjvsdRb0AvoN4rJsOhZpVBj4Xzx6uCAjCIUWWBzUjEy0DSbP RpyOzhfyByrgeb0M515q0wZdG9oks68WkSltztBbVfUlctQRCxhA9X9WJEm2Z5UZ5P a+8PZRLH1BhjA== Received: from fedora (unknown [100.64.0.11]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange ECDHE (prime256v1) server-signature RSA-PSS (4096 bits) server-digest SHA256) (No client certificate requested) (Authenticated sender: bbrezillon) by bali.collaboradmins.com (Postfix) with ESMTPSA id 7F31117E09AC; Fri, 10 Apr 2026 20:12:59 +0200 (CEST) Date: Fri, 10 Apr 2026 20:12:54 +0200 From: Boris Brezillon To: Karunika Choo Cc: dri-devel@lists.freedesktop.org, nd@arm.com, Steven Price , Liviu Dudau , Maarten Lankhorst , Maxime Ripard , Thomas Zimmermann , David Airlie , Simona Vetter , linux-kernel@vger.kernel.org Subject: Re: [PATCH 7/8] drm/panthor: Use a local iomem base for firmware control registers Message-ID: <20260410201254.51262af8@fedora> In-Reply-To: <20260410164637.549145-8-karunika.choo@arm.com> References: <20260410164637.549145-1-karunika.choo@arm.com> <20260410164637.549145-8-karunika.choo@arm.com> Organization: Collabora X-Mailer: Claws Mail 4.3.1 (GTK 3.24.51; x86_64-redhat-linux-gnu) MIME-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit X-BeenThere: dri-devel@lists.freedesktop.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Direct Rendering Infrastructure - Development List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: dri-devel-bounces@lists.freedesktop.org Sender: "dri-devel" On Fri, 10 Apr 2026 17:46:36 +0100 Karunika Choo wrote: > Add an MCU_CONTROL-local iomem pointer to struct panthor_fw and use it > for firmware control and status register accesses. > > Job interrupt accesses continue to go through the IRQ-local base, while > doorbell writes stay on the device-wide mapping because they live > outside the MCU control window. This keeps firmware register accesses > scoped to the component that owns them. > > No functional change intended. > > Signed-off-by: Karunika Choo Acked-by: Boris Brezillon > --- > drivers/gpu/drm/panthor/panthor_fw.c | 20 +++++++++++++------- > drivers/gpu/drm/panthor/panthor_fw_regs.h | 11 ++++------- > 2 files changed, 17 insertions(+), 14 deletions(-) > > diff --git a/drivers/gpu/drm/panthor/panthor_fw.c b/drivers/gpu/drm/panthor/panthor_fw.c > index 20747f42759f..bf7c2baefb79 100644 > --- a/drivers/gpu/drm/panthor/panthor_fw.c > +++ b/drivers/gpu/drm/panthor/panthor_fw.c > @@ -234,6 +234,9 @@ struct panthor_fw_iface { > * struct panthor_fw - Firmware management > */ > struct panthor_fw { > + /** @iomem: CPU mapping of MCU_CONTROL iomem region */ > + void __iomem *iomem; > + > /** @vm: MCU VM. */ > struct panthor_vm *vm; > > @@ -1069,7 +1072,7 @@ static void panthor_job_irq_handler(struct panthor_device *ptdev, u32 status) > if (tracepoint_enabled(gpu_job_irq)) > start = ktime_get_ns(); > > - gpu_write(ptdev->iomem, JOB_INT_CLEAR, status); > + gpu_write(ptdev->fw->irq.iomem, INT_CLEAR, status); > > if (!ptdev->fw->booted && (status & JOB_INT_GLOBAL_IF)) > ptdev->fw->booted = true; > @@ -1092,18 +1095,19 @@ PANTHOR_IRQ_HANDLER(job, panthor_job_irq_handler); > > static int panthor_fw_start(struct panthor_device *ptdev) > { > + struct panthor_fw *fw = ptdev->fw; > bool timedout = false; > > ptdev->fw->booted = false; > panthor_job_irq_enable_events(&ptdev->fw->irq, ~0); > panthor_job_irq_resume(&ptdev->fw->irq); > - gpu_write(ptdev->iomem, MCU_CONTROL, MCU_CONTROL_AUTO); > + gpu_write(fw->iomem, MCU_CONTROL, MCU_CONTROL_AUTO); > > if (!wait_event_timeout(ptdev->fw->req_waitqueue, > ptdev->fw->booted, > msecs_to_jiffies(1000))) { > if (!ptdev->fw->booted && > - !(gpu_read(ptdev->iomem, JOB_INT_STAT) & JOB_INT_GLOBAL_IF)) > + !(gpu_read(fw->irq.iomem, INT_STAT) & JOB_INT_GLOBAL_IF)) > timedout = true; > } > > @@ -1114,7 +1118,7 @@ static int panthor_fw_start(struct panthor_device *ptdev) > [MCU_STATUS_HALT] = "halt", > [MCU_STATUS_FATAL] = "fatal", > }; > - u32 status = gpu_read(ptdev->iomem, MCU_STATUS); > + u32 status = gpu_read(fw->iomem, MCU_STATUS); > > drm_err(&ptdev->base, "Failed to boot MCU (status=%s)", > status < ARRAY_SIZE(status_str) ? status_str[status] : "unknown"); > @@ -1126,10 +1130,11 @@ static int panthor_fw_start(struct panthor_device *ptdev) > > static void panthor_fw_stop(struct panthor_device *ptdev) > { > + struct panthor_fw *fw = ptdev->fw; > u32 status; > > - gpu_write(ptdev->iomem, MCU_CONTROL, MCU_CONTROL_DISABLE); > - if (gpu_read_poll_timeout(ptdev->iomem, MCU_STATUS, status, > + gpu_write(fw->iomem, MCU_CONTROL, MCU_CONTROL_DISABLE); > + if (gpu_read_poll_timeout(fw->iomem, MCU_STATUS, status, > status == MCU_STATUS_DISABLED, 10, 100000)) > drm_err(&ptdev->base, "Failed to stop MCU"); > } > @@ -1139,7 +1144,7 @@ static bool panthor_fw_mcu_halted(struct panthor_device *ptdev) > struct panthor_fw_global_iface *glb_iface = panthor_fw_get_glb_iface(ptdev); > bool halted; > > - halted = gpu_read(ptdev->iomem, MCU_STATUS) == MCU_STATUS_HALT; > + halted = gpu_read(ptdev->fw->iomem, MCU_STATUS) == MCU_STATUS_HALT; > > if (panthor_fw_has_glb_state(ptdev)) > halted &= (GLB_STATE_GET(glb_iface->output->ack) == GLB_STATE_HALT); > @@ -1461,6 +1466,7 @@ int panthor_fw_init(struct panthor_device *ptdev) > if (!fw) > return -ENOMEM; > > + fw->iomem = ptdev->iomem + MCU_CONTROL_BASE; > ptdev->fw = fw; > init_waitqueue_head(&fw->req_waitqueue); > INIT_LIST_HEAD(&fw->sections); > diff --git a/drivers/gpu/drm/panthor/panthor_fw_regs.h b/drivers/gpu/drm/panthor/panthor_fw_regs.h > index eeb41aff249b..b2e59cfc22b0 100644 > --- a/drivers/gpu/drm/panthor/panthor_fw_regs.h > +++ b/drivers/gpu/drm/panthor/panthor_fw_regs.h > @@ -4,23 +4,20 @@ > #ifndef __PANTHOR_FW_REGS_H__ > #define __PANTHOR_FW_REGS_H__ > > -#define MCU_CONTROL 0x700 > +#define MCU_CONTROL_BASE 0x700 > + > +#define MCU_CONTROL 0x0 > #define MCU_CONTROL_ENABLE 1 > #define MCU_CONTROL_AUTO 2 > #define MCU_CONTROL_DISABLE 0 > > -#define MCU_STATUS 0x704 > +#define MCU_STATUS 0x4 > #define MCU_STATUS_DISABLED 0 > #define MCU_STATUS_ENABLED 1 > #define MCU_STATUS_HALT 2 > #define MCU_STATUS_FATAL 3 > > #define JOB_INT_BASE 0x1000 > - > -#define JOB_INT_RAWSTAT 0x1000 > -#define JOB_INT_CLEAR 0x1004 > -#define JOB_INT_MASK 0x1008 > -#define JOB_INT_STAT 0x100c > #define JOB_INT_GLOBAL_IF BIT(31) > #define JOB_INT_CSG_IF(x) BIT(x) >