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Received: from localhost ([::1] helo=merlin.infradead.org) by merlin.infradead.org with esmtp (Exim 4.92.3 #3 (Red Hat Linux)) id 1kFz8q-0002oS-Tj; Wed, 09 Sep 2020 12:24:00 +0000 Received: from foss.arm.com ([217.140.110.172]) by merlin.infradead.org with esmtp (Exim 4.92.3 #3 (Red Hat Linux)) id 1kFz8a-0002i7-Tk; Wed, 09 Sep 2020 12:23:46 +0000 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 B875513D5; Wed, 9 Sep 2020 05:23:43 -0700 (PDT) Received: from [192.168.1.179] (unknown [172.31.20.19]) by usa-sjc-imap-foss1.foss.arm.com (Postfix) with ESMTPSA id 99DC13F68F; Wed, 9 Sep 2020 05:23:42 -0700 (PDT) Subject: Re: [PATCH 4/5] drm/panfrost: add amlogic reset quirk callback To: Neil Armstrong , robh@kernel.org, tomeu.vizoso@collabora.com, alyssa.rosenzweig@collabora.com References: <20200908151853.4837-1-narmstrong@baylibre.com> <20200908151853.4837-5-narmstrong@baylibre.com> From: Steven Price Message-ID: <5efe218c-19d5-c25b-74cc-e5ae5da418a2@arm.com> Date: Wed, 9 Sep 2020 13:23:41 +0100 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:68.0) Gecko/20100101 Thunderbird/68.10.0 MIME-Version: 1.0 In-Reply-To: <20200908151853.4837-5-narmstrong@baylibre.com> Content-Language: en-GB X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20200909_082345_109782_CDCA2223 X-CRM114-Status: GOOD ( 24.46 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: linux-amlogic@lists.infradead.org, linux-arm-kernel@lists.infradead.org, dri-devel@lists.freedesktop.org, linux-kernel@vger.kernel.org Content-Transfer-Encoding: 7bit Content-Type: text/plain; charset="us-ascii"; Format="flowed" Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org On 08/09/2020 16:18, Neil Armstrong wrote: > The T820, G31 & G52 GPUs integratewd by Amlogic in the respective GXM, G12A/SM1 & G12B > SoCs needs a quirk in the PWR registers at the GPU reset time. > > Since the documentation of the GPU cores are not public, we do not know what does these > values, but they permit having a fully functional GPU running with Panfrost. > > Signed-off-by: Neil Armstrong > --- > drivers/gpu/drm/panfrost/panfrost_gpu.c | 13 +++++++++++++ > drivers/gpu/drm/panfrost/panfrost_gpu.h | 2 ++ > drivers/gpu/drm/panfrost/panfrost_regs.h | 3 +++ > 3 files changed, 18 insertions(+) > > diff --git a/drivers/gpu/drm/panfrost/panfrost_gpu.c b/drivers/gpu/drm/panfrost/panfrost_gpu.c > index c129aaf77790..018737bd4ac6 100644 > --- a/drivers/gpu/drm/panfrost/panfrost_gpu.c > +++ b/drivers/gpu/drm/panfrost/panfrost_gpu.c > @@ -80,6 +80,19 @@ int panfrost_gpu_soft_reset(struct panfrost_device *pfdev) > return 0; > } > > +void panfrost_gpu_amlogic_quirks(struct panfrost_device *pfdev) > +{ > + /* > + * The Amlogic integrated Mali-T820, Mali-G31 & Mali-G52 needs > + * these undocumented bits to be set in order to operate > + * correctly. > + * These GPU_PWR registers contains: > + * "device-specific power control value" > + */ > + gpu_write(pfdev, GPU_PWR_KEY, 0x2968A819); As Alyssa has mentioned this magic value is not Amlogic specific, but is just the unlock key value, so please add the define in panfrost-gpu.h > + gpu_write(pfdev, GPU_PWR_OVERRIDE1, 0xfff | (0x20 << 16)); But PWR_OVERRIDE1 is indeed device specific so I can't offer an insight here. > +} > + > static void panfrost_gpu_init_quirks(struct panfrost_device *pfdev) > { > u32 quirks = 0; > diff --git a/drivers/gpu/drm/panfrost/panfrost_gpu.h b/drivers/gpu/drm/panfrost/panfrost_gpu.h > index 4112412087b2..a881d7dc812f 100644 > --- a/drivers/gpu/drm/panfrost/panfrost_gpu.h > +++ b/drivers/gpu/drm/panfrost/panfrost_gpu.h > @@ -16,4 +16,6 @@ int panfrost_gpu_soft_reset(struct panfrost_device *pfdev); > void panfrost_gpu_power_on(struct panfrost_device *pfdev); > void panfrost_gpu_power_off(struct panfrost_device *pfdev); > > +void panfrost_gpu_amlogic_reset_quirk(struct panfrost_device *pfdev); You need to be consistent about the name - this has _reset_, the above function doesn't. Steve > + > #endif > diff --git a/drivers/gpu/drm/panfrost/panfrost_regs.h b/drivers/gpu/drm/panfrost/panfrost_regs.h > index ea38ac60581c..fa0d02f3c830 100644 > --- a/drivers/gpu/drm/panfrost/panfrost_regs.h > +++ b/drivers/gpu/drm/panfrost/panfrost_regs.h > @@ -51,6 +51,9 @@ > #define GPU_STATUS 0x34 > #define GPU_STATUS_PRFCNT_ACTIVE BIT(2) > #define GPU_LATEST_FLUSH_ID 0x38 > +#define GPU_PWR_KEY 0x050 /* (WO) Power manager key register */ > +#define GPU_PWR_OVERRIDE0 0x054 /* (RW) Power manager override settings */ > +#define GPU_PWR_OVERRIDE1 0x058 /* (RW) Power manager override settings */ > #define GPU_FAULT_STATUS 0x3C > #define GPU_FAULT_ADDRESS_LO 0x40 > #define GPU_FAULT_ADDRESS_HI 0x44 > _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel