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Tue, 30 Jul 2024 01:23:06 -0700 (PDT) Received: from [192.168.1.20] ([178.197.219.137]) by smtp.gmail.com with ESMTPSA id ffacd0b85a97d-36b368706c2sm14005179f8f.117.2024.07.30.01.23.05 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Tue, 30 Jul 2024 01:23:06 -0700 (PDT) Message-ID: <22b20ad7-8a25-4cb2-a24e-d6841b219977@linaro.org> Date: Tue, 30 Jul 2024 10:23:04 +0200 Precedence: bulk X-Mailing-List: stable@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH] soundwire: stream: fix programming slave ports for non-continous port maps To: Pierre-Louis Bossart , Vinod Koul , Bard Liao , Sanyog Kale , Shreyas NC , alsa-devel@alsa-project.org, linux-kernel@vger.kernel.org Cc: stable@vger.kernel.org References: <20240729140157.326450-1-krzysztof.kozlowski@linaro.org> <095d7119-8221-450a-9616-2df6a0df4c77@linux.intel.com> From: Krzysztof Kozlowski Content-Language: en-US Autocrypt: addr=krzysztof.kozlowski@linaro.org; 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charset=UTF-8 Content-Transfer-Encoding: 7bit On 29/07/2024 16:25, Pierre-Louis Bossart wrote: > > > On 7/29/24 16:01, Krzysztof Kozlowski wrote: >> Two bitmasks in 'struct sdw_slave_prop' - 'source_ports' and >> 'sink_ports' - define which ports to program in >> sdw_program_slave_port_params(). The masks are used to get the >> appropriate data port properties ('struct sdw_get_slave_dpn_prop') from >> an array. >> >> Bitmasks can be non-continuous or can start from index different than 0, >> thus when looking for matching port property for given port, we must >> iterate over mask bits, not from 0 up to number of ports. >> >> This fixes allocation and programming slave ports, when a source or sink >> masks start from further index. >> >> Fixes: f8101c74aa54 ("soundwire: Add Master and Slave port programming") >> Cc: >> Signed-off-by: Krzysztof Kozlowski > > This is a valid change to optimize how the port are accessed. > > But the commit message is not completely clear, the allocation in > mipi_disco.c is not modified and I don't think there's anything that > would crash. If there are non-contiguous ports, we will still allocate > space that will not be initialized/used. > > /* Allocate memory for set bits in port lists */ > nval = hweight32(prop->source_ports); > prop->src_dpn_prop = devm_kcalloc(&slave->dev, nval, > sizeof(*prop->src_dpn_prop), > GFP_KERNEL); > if (!prop->src_dpn_prop) > return -ENOMEM; > > /* Read dpn properties for source port(s) */ > sdw_slave_read_dpn(slave, prop->src_dpn_prop, nval, > prop->source_ports, "source"); > > IOW, this is a valid change, but it's an optimization, not a fix in the > usual sense of 'kernel oops otherwise'. > > Am I missing something? > > BTW, the notion of DPn is that n > 0. DP0 is a special case with > different properties, BIT(0) cannot be set for either of the sink/source > port bitmask. I think we speak about two different things. port num > 1, that's correct. But index for src_dpn_prop array is something different. Look at mipi-disco sdw_slave_read_dpn(): 173 u32 bit, i = 0; ... 178 addr = ports; 179 /* valid ports are 1 to 14 so apply mask */ 180 addr &= GENMASK(14, 1); 181 182 for_each_set_bit(bit, &addr, 32) { ... 186 dpn[i].num = bit; so dpn[0..i] = 1..n where i is also the bit in the mask. Similar implementation was done in Qualcomm wsa and wcd codecs like: array indexed from 0: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/tree/sound/soc/codecs/wcd938x-sdw.c?h=v6.11-rc1#n51 genmask from 0, with a mistake: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/tree/sound/soc/codecs/wcd938x-sdw.c?h=v6.11-rc1#n1255 The mistake I corrected here: https://lore.kernel.org/all/20240726-asoc-wcd-wsa-swr-ports-genmask-v1-0-d4d7a8b56f05@linaro.org/ To summarize, the mask does not denote port numbers (1...14) but indices of the dpn array which are from 0..whatever (usually -1 from port number). Best regards, Krzysztof