Re: [PATCH 1/3] media: rc: meson-ir: support rc driver type RC_DRIVER_SCANCODE

From: Zelong Dong <Zelong.Dong@amlogic.com>
To: Sean Young <sean@mess.org>
Cc: Neil Armstrong <neil.armstrong@linaro.org>,
	Mauro Carvalho Chehab <mchehab@kernel.org>,
	Rob Herring <robh+dt@kernel.org>,
	Jerome Brunet <jbrunet@baylibre.com>,
	Krzysztof Kozlowski <krzysztof.kozlowski+dt@linaro.org>,
	Conor Dooley <conor+dt@kernel.org>,
	Kevin Hilman <khilman@baylibre.com>,
	Martin Blumenstingl <martin.blumenstingl@googlemail.com>,
	linux-media@vger.kernel.org, linux-amlogic@lists.infradead.org,
	devicetree@vger.kernel.org, linux-arm-kernel@lists.infradead.org,
	Qianggui.Song@amlogic.com, Yonghui.Yu@amlogic.com,
	kelvin.zhang@amlogic.com
Subject: Re: [PATCH 1/3] media: rc: meson-ir: support rc driver type RC_DRIVER_SCANCODE
Date: Thu, 31 Aug 2023 20:13:22 +0800	[thread overview]
Message-ID: <b6e9fc91-0c99-5635-235b-76bc6db55f75@amlogic.com> (raw)
In-Reply-To: <ZO2gvMl2IS70ve3T@gofer.mess.org>

在 2023/8/29 15:39, Sean Young 写道:
> On Fri, Aug 25, 2023 at 07:53:08PM +0800, zelong dong wrote:
>> From: Zelong Dong<zelong.dong@amlogic.com>
>>
>> Meson IR Controller supports hardware decoder in Meson-S4 and later
>> SoC. So far, protocol NEC could be decoded by hardware decoder.
> On Meson-S4, only the hardware decoder for NEC can be used using this
> driver. Does the Meson-S4 hardware support software decoding? If
> software decoding could be used, then any protocol could be supported,
> not just NEC.
> 
> Also, out of interest, is there are documentation available for this
> hardware?
> 
> Thanks,
> 
> Sean
> 
Yes, IR driver still supports SW decoding on Meson-S4. The decode mode 
could be changed by 'support_hw_decoder'.
If IR Controller works in SW decoding, driver will be registered by 
RC_DRIVER_IR_RAW and allows all protocol.
Otherwise, driver will be registered by RC_DRIVER_SCANCODE and only 
allows NEC.

489         if (ir->rc->driver_type == RC_DRIVER_IR_RAW) {
490                 ir->rc->allowed_protocols = RC_PROTO_BIT_ALL_IR_DECODER;
491                 ir->rc->rx_resolution = MESON_RAW_TRATE;
492                 ir->rc->min_timeout = 1;
493                 ir->rc->timeout = IR_DEFAULT_TIMEOUT;
494                 ir->rc->max_timeout = 10 * IR_DEFAULT_TIMEOUT;
495         } else if (ir->rc->driver_type == RC_DRIVER_SCANCODE) {
496                 ir->rc->allowed_protocols = RC_PROTO_BIT_NEC;
497                 ir->rc->change_protocol = meson_ir_hw_decoder_init;
498         }

Do you get Meson-S4 datasheet? Please refer to chapter 13.5 Infrared Remote.