From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from foss.arm.com (foss.arm.com [217.140.110.172]) by smtp.subspace.kernel.org (Postfix) with ESMTP id E8F151E8826 for ; Wed, 15 Apr 2026 12:23:02 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=217.140.110.172 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1776255784; cv=none; b=GZiuupgiWJhgnBI02mz8OM5x2XwQomec2rVIN7Hc6x7GAVyrjqcceDro+sEWygclFjPPW8VF4L1EwWI9IF/3kLm3RC1C6n4Zr/Zcf/u+QhcD0KtJErSCpwKgR247tjjAvXGXVAALJSnuR/7tPT43fT6ElkGyY4fqJlvLivoqIEo= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1776255784; c=relaxed/simple; bh=FfipqrmjOX9TKzTPMTBbwZ4ueEuIDsAed3GXZZfu7Lo=; h=Date:From:To:Cc:Subject:Message-ID:References:MIME-Version: Content-Type:Content-Disposition:In-Reply-To; b=dG6YeD/csLzhgvss29SjyE+gCKnMmSitHCkbloX+yOFTGn3kaogVG0F95JtSelHElOpO7e5wP6Wxsfk1Xci3VV6Fzc5AocL0mTlk3nDicUNBHpt7IwMU2LZwP0fVbQlknQvIjiI8iz0KU6kINamapmAlpmCcqtTa31/vpU8Cles= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=arm.com; spf=pass smtp.mailfrom=arm.com; dkim=pass (1024-bit key) header.d=arm.com header.i=@arm.com header.b=ihfFbBWO; arc=none smtp.client-ip=217.140.110.172 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=arm.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=arm.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=arm.com header.i=@arm.com header.b="ihfFbBWO" Received: from usa-sjc-imap-foss1.foss.arm.com (unknown [10.121.207.14]) by usa-sjc-mx-foss1.foss.arm.com (Postfix) with ESMTP id 8E6641F60 for ; Wed, 15 Apr 2026 05:22:56 -0700 (PDT) Received: from [192.168.0.1] (usa-sjc-imap-foss1.foss.arm.com [10.121.207.14]) by usa-sjc-imap-foss1.foss.arm.com (Postfix) with ESMTPA id EE7AD3F86F for ; Wed, 15 Apr 2026 05:23:01 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=simple/simple; d=arm.com; s=foss; t=1776255782; bh=FfipqrmjOX9TKzTPMTBbwZ4ueEuIDsAed3GXZZfu7Lo=; h=Date:From:To:Cc:Subject:References:In-Reply-To:From; b=ihfFbBWO7vreX4NkRBBgf5v3djw4H5knyJ+y5eCbJz3a/oTjxszzhxi8vHc/wU9gS U6YEXAKh1Y72UUsL5/Pa1meyFx/0bJI2y7aLx9mLroJ0jTNJDbRHSJ4L/Pu0f6xbGt +FFqjba0IcZ3oAvgj4rJRRqNjE2EIWTRzO0igHL4= Date: Wed, 15 Apr 2026 13:22:51 +0100 From: Liviu Dudau To: Karunika Choo Cc: dri-devel@lists.freedesktop.org, nd@arm.com, Boris Brezillon , Steven Price , Maarten Lankhorst , Maxime Ripard , Thomas Zimmermann , David Airlie , Simona Vetter , linux-kernel@vger.kernel.org Subject: Re: [PATCH v2 7/8] drm/panthor: Use a local iomem base for firmware control registers Message-ID: References: <20260412142951.2309135-1-karunika.choo@arm.com> <20260412142951.2309135-8-karunika.choo@arm.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Disposition: inline Content-Transfer-Encoding: 8bit In-Reply-To: <20260412142951.2309135-8-karunika.choo@arm.com> On Sun, Apr 12, 2026 at 03:29:50PM +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. > > v2: > - Pick up Ack from Boris. > > Acked-by: Boris Brezillon > Signed-off-by: Karunika Choo Reviewed-by: Liviu Dudau Best regards, Liviu > --- > 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 73ef07a37e22..986151681b24 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) > > -- > 2.43.0 > -- ==================== | I would like to | | fix the world, | | but they're not | | giving me the | \ source code! / --------------- ¯\_(ツ)_/¯