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[82.69.66.36]) by smtp.gmail.com with ESMTPSA id 5b1f17b1804b1-4367086e40esm534085855e9.30.2025.01.06.05.06.54 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 06 Jan 2025 05:06:54 -0800 (PST) Date: Mon, 6 Jan 2025 13:06:53 +0000 From: David Laight To: Wolfram Sang Cc: linux-i3c@lists.infradead.org, linux-kernel@vger.kernel.org, linux-renesas-soc@vger.kernel.org, Jarkko Nikula , Alexandre Belloni Subject: Re: [PATCH v3 4/5] i3c: mipi-i3c-hci: use parity8 helper instead of open coding it Message-ID: <20250106130653.7fe81eae@pumpkin> In-Reply-To: <20250106092725.22869-5-wsa+renesas@sang-engineering.com> References: <20250106092725.22869-1-wsa+renesas@sang-engineering.com> <20250106092725.22869-5-wsa+renesas@sang-engineering.com> X-Mailer: Claws Mail 4.1.1 (GTK 3.24.38; arm-unknown-linux-gnueabihf) 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=US-ASCII Content-Transfer-Encoding: 7bit On Mon, 6 Jan 2025 10:27:22 +0100 Wolfram Sang wrote: > The kernel has now a generic helper for getting parity with easier to > understand semantics. Make use of it. This need to explain that although the algorithm has changed the existing code is wrong. David > > Signed-off-by: Wolfram Sang > Tested-by: Jarkko Nikula > --- > drivers/i3c/master/mipi-i3c-hci/dat_v1.c | 11 +---------- > 1 file changed, 1 insertion(+), 10 deletions(-) > > diff --git a/drivers/i3c/master/mipi-i3c-hci/dat_v1.c b/drivers/i3c/master/mipi-i3c-hci/dat_v1.c > index 47b9b4d4ed3f..85c4916972e4 100644 > --- a/drivers/i3c/master/mipi-i3c-hci/dat_v1.c > +++ b/drivers/i3c/master/mipi-i3c-hci/dat_v1.c > @@ -40,15 +40,6 @@ > #define dat_w0_write(i, v) writel(v, hci->DAT_regs + (i) * 8) > #define dat_w1_write(i, v) writel(v, hci->DAT_regs + (i) * 8 + 4) > > -static inline bool dynaddr_parity(unsigned int addr) > -{ > - addr |= 1 << 7; > - addr += addr >> 4; > - addr += addr >> 2; > - addr += addr >> 1; > - return (addr & 1); > -} > - > static int hci_dat_v1_init(struct i3c_hci *hci) > { > unsigned int dat_idx; > @@ -123,7 +114,7 @@ static void hci_dat_v1_set_dynamic_addr(struct i3c_hci *hci, > dat_w0 = dat_w0_read(dat_idx); > dat_w0 &= ~(DAT_0_DYNAMIC_ADDRESS | DAT_0_DYNADDR_PARITY); > dat_w0 |= FIELD_PREP(DAT_0_DYNAMIC_ADDRESS, address) | > - (dynaddr_parity(address) ? DAT_0_DYNADDR_PARITY : 0); > + (parity8(address) ? 0 : DAT_0_DYNADDR_PARITY); > dat_w0_write(dat_idx, dat_w0); > } >