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bh=hi2rPF/VTt+7YBV2OIek85mNirM/1FNuwC783UZ79gY=; b=lWmnUFeLbjfFO262W8k04yfQ69FYowN4slKISzZ+Bkc7FznivOQzbhZfFARW6fKlZq hPBGlKIBuPsy4reIDCB/a+BYpJj8WqE06BHp6HwlTZE/UJIyGXzQbRrDaZdBumdYRTVl IxRI47YLiQJ3N1PXP6oHg/01lRjP4IzuR2B5682Aoo4RFt1FhAvVEO285E2WykLNvNEW I/ZFP5W2zkZ4xYxERxTPm82PeRJode+KQgCuHBspW0kqbDF5BVzcc2Z6flm6c2E6J/yt He77aOj9heuuB8sHohjMz1O/9sxBmI9T7LDvMmRrqyl4bkBvm9mDWkqUNuRBo3NikIdy 1/tA== X-Gm-Message-State: AOAM533gpOHmxv6rUQIaeAr9cEPXH06GlGjYDP0KP5yChdFjwXQlYjIs xA50LWiKmf7QBezUD90N1tnZaBaRNUEzn1oD4+/4GQ== X-Google-Smtp-Source: ABdhPJwS1vT6jl1+U7TJLvBVogQi38c1rNUQm4Kcmwy0nzE27iFQkCgHBkdfG6By1N4TLFUCpb7VEZDUgpxahYlWQZM= X-Received: by 2002:a1f:1c17:: with SMTP id c23mr17961911vkc.0.1600668630316; Sun, 20 Sep 2020 23:10:30 -0700 (PDT) MIME-Version: 1.0 References: <20200918083124.3921207-1-ikjn@chromium.org> <20200918162834.v2.2.I3de2918f09b817cc2ae6d324f1ece62779ecc7cf@changeid> In-Reply-To: From: Ikjoon Jang Date: Mon, 21 Sep 2020 14:10:19 +0800 Message-ID: Subject: Re: [PATCH v2 2/5] spi: spi-mtk-nor: fix mishandled logics in checking SPI memory operation To: Chuanhong Guo X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20200921_021034_202276_7F2B7EAB X-CRM114-Status: GOOD ( 39.37 ) 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: "open list:OPEN FIRMWARE AND FLATTENED DEVICE TREE BINDINGS" , open list , Rob Herring , linux-spi@vger.kernel.org, Mark Brown , linux-mtd@lists.infradead.org, Matthias Brugger , "moderated list:ARM/Mediatek SoC support" , "moderated list:ARM/Mediatek SoC support" Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org On Fri, Sep 18, 2020 at 9:09 PM Chuanhong Guo wrote: > > Hi! > > On Fri, Sep 18, 2020 at 4:34 PM Ikjoon Jang wrote: > > > > Fix a simple bug which can limits its transfer size, > > and add a simple helper function for code cleanups. > > > > Fixes: a59b2c7c56bf ("spi: spi-mtk-nor: support standard spi properties") > > Signed-off-by: Ikjoon Jang > > > > --- > > > > (no changes since v1) > > > > drivers/spi/spi-mtk-nor.c | 62 ++++++++++++++++++++++++--------------- > > 1 file changed, 38 insertions(+), 24 deletions(-) > > > > diff --git a/drivers/spi/spi-mtk-nor.c b/drivers/spi/spi-mtk-nor.c > > index 6e6ca2b8e6c8..54b2c0fde95b 100644 > > --- a/drivers/spi/spi-mtk-nor.c > > +++ b/drivers/spi/spi-mtk-nor.c > > @@ -167,52 +167,63 @@ static bool mtk_nor_match_read(const struct spi_mem_op *op) > > return false; > > } > > > > -static int mtk_nor_adjust_op_size(struct spi_mem *mem, struct spi_mem_op *op) > > +static bool need_bounce(void *cpu_addr, unsigned long len) > > { > > - size_t len; > > + return !!(((uintptr_t)cpu_addr) & MTK_NOR_DMA_ALIGN_MASK); > > +} > > parameter 'len' isn't used in this function. ACK. > > > > > +static int mtk_nor_adjust_op_size(struct spi_mem *mem, struct spi_mem_op *op) > > +{ > > if (!op->data.nbytes) > > return 0; > > > > if ((op->addr.nbytes == 3) || (op->addr.nbytes == 4)) { > > - if ((op->data.dir == SPI_MEM_DATA_IN) && > > - mtk_nor_match_read(op)) { > > I think replacing a if/else if with a two-case switch is more > of a personal code preference rather than code cleanup. > I'd prefer only adding need_bounce to replace alignment > check using a separated commit and leave other stuff > untouched because: > 1. This "cleanup" made unintended logic changes (see below) > 2. The "cleanup" itself actually becomes the major part of > this patch, while the actual fix mentioned in commit > message is the minor part. > 3. A fix commit should contain the fix itself. It shouldn't > mix with these code changes. Got it, v3 will only include the fix itself. > > > + switch (op->data.dir) { > > + case SPI_MEM_DATA_IN: > > + if (!mtk_nor_match_read(op)) > > + return -EINVAL; > > You are changing the code logic here. > mtk_nor_match_read checks if the operation can be executed > using controller PIO/DMA reading. Even if it's not supported, > we can still use PRG mode to execute the operation. > One example of such an operation is SPI NOR SFDP reading. > Your change breaks that which then breaks 1_2_2 and 1_4_4 > reading capability because spi-nor driver parses these op formats > from SFDP table. As you already noticed it, this is a bug from the last patch I made and v2 isn't fixing this problem. This should be restored & fixed in v3. And will not include other changes in a same patch. > > > + /* check if it's DMAable */ > > if ((op->addr.val & MTK_NOR_DMA_ALIGN_MASK) || > > - (op->data.nbytes < MTK_NOR_DMA_ALIGN)) > > + (op->data.nbytes < MTK_NOR_DMA_ALIGN)) { > > op->data.nbytes = 1; > > - else if (!((ulong)(op->data.buf.in) & > > - MTK_NOR_DMA_ALIGN_MASK)) > > + } else { > > + if (need_bounce(op->data.buf.in, op->data.nbytes) && > > + (op->data.nbytes > MTK_NOR_BOUNCE_BUF_SIZE)) > > + op->data.nbytes = MTK_NOR_BOUNCE_BUF_SIZE; > > op->data.nbytes &= ~MTK_NOR_DMA_ALIGN_MASK; > > - else if (op->data.nbytes > MTK_NOR_BOUNCE_BUF_SIZE) > > - op->data.nbytes = MTK_NOR_BOUNCE_BUF_SIZE; > > data length alignment is intentionally done only for DMA reading > without the bounce buffer. > My intention here: > If we use the bounce buffer, we can read more data than needed to. > Say we want 25 bytes of data, reading 32 bytes using DMA and > bounce buffer should be faster than reading 16 bytes with DMA > and another 9 bytes with PIO, because for every single byte of PIO > reading, adjust_op_size and exec_op is called once, we > program controller with new cmd/address, and controller need > to send extra cmd/address to flash. > I noticed that you removed this part of logic from DMA reading > execution in 3/5 as well. Please revert the logic change here > add in DMA reading function (see later comment in 3/5). In v2, I wasn't sure whether this behavior is sane (read more than requested) Now I think this is okay, I've missed the fact that flash address is also aligned together. I'll just keep the previous logics with padding in v3. Thanks! > > > - return 0; > > - } else if (op->data.dir == SPI_MEM_DATA_OUT) { > > + } > > + break; > > + case SPI_MEM_DATA_OUT: > > if (op->data.nbytes >= MTK_NOR_PP_SIZE) > > op->data.nbytes = MTK_NOR_PP_SIZE; > > else > > op->data.nbytes = 1; > > - return 0; > > + break; > > + default: > > + break; > > } > > + } else { > > + u8 len = op->cmd.nbytes + op->addr.nbytes + op->dummy.nbytes; > > + > > + if (len > MTK_NOR_PRG_MAX_SIZE) > > + return -EINVAL; > > + if (op->data.nbytes && !(MTK_NOR_PRG_MAX_SIZE - len)) > > + return -EINVAL; > > + if (op->data.nbytes > (MTK_NOR_PRG_MAX_SIZE - len)) > > + op->data.nbytes = MTK_NOR_PRG_MAX_SIZE - len; > > } > > > > - len = MTK_NOR_PRG_MAX_SIZE - op->cmd.nbytes - op->addr.nbytes - > > - op->dummy.nbytes; > > - if (op->data.nbytes > len) > > - op->data.nbytes = len; > > - > > return 0; > > } > > > > static bool mtk_nor_supports_op(struct spi_mem *mem, > > const struct spi_mem_op *op) > > { > > - size_t len; > > - > > if (op->cmd.buswidth != 1) > > return false; > > > > if ((op->addr.nbytes == 3) || (op->addr.nbytes == 4)) { > > - switch(op->data.dir) { > > + switch (op->data.dir) { > > case SPI_MEM_DATA_IN: > > if (!mtk_nor_match_read(op)) > > return false; > > @@ -226,11 +237,14 @@ static bool mtk_nor_supports_op(struct spi_mem *mem, > > default: > > break; > > } > > + } else { > > + u8 len = op->cmd.nbytes + op->addr.nbytes + op->dummy.nbytes; > > + > > + if (len > MTK_NOR_PRG_MAX_SIZE) > > + return false; > > + if (op->data.nbytes && !(MTK_NOR_PRG_MAX_SIZE - len)) > > + return false; > > } > > - len = op->cmd.nbytes + op->addr.nbytes + op->dummy.nbytes; > > - if ((len > MTK_NOR_PRG_MAX_SIZE) || > > - ((op->data.nbytes) && (len == MTK_NOR_PRG_MAX_SIZE))) > > - return false; > > > > return spi_mem_default_supports_op(mem, op); > > } > > -- > > 2.28.0.681.g6f77f65b4e-goog > > > > > -- > Regards, > Chuanhong Guo _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel