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[90.63.244.31]) by smtp.gmail.com with ESMTPSA id t15sm9153447wmt.2.2019.05.27.05.37.06 (version=TLS1_2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Mon, 27 May 2019 05:37:06 -0700 (PDT) Subject: Re: [PATCH 10/14] pwm: meson: simplify the calculation of the pre-divider and count To: =?UTF-8?Q?Uwe_Kleine-K=c3=b6nig?= , Martin Blumenstingl , Thierry Reding Cc: kernel@pengutronix.de, linux-amlogic@lists.infradead.org, linux-kernel@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-pwm@vger.kernel.org References: <20190525181133.4875-1-martin.blumenstingl@googlemail.com> <20190525181133.4875-11-martin.blumenstingl@googlemail.com> <20190526194120.uzuq6ncz5l2z4hfm@pengutronix.de> From: Neil Armstrong Openpgp: preference=signencrypt Autocrypt: addr=narmstrong@baylibre.com; prefer-encrypt=mutual; keydata= mQENBE1ZBs8BCAD78xVLsXPwV/2qQx2FaO/7mhWL0Qodw8UcQJnkrWmgTFRobtTWxuRx8WWP GTjuhvbleoQ5Cxjr+v+1ARGCH46MxFP5DwauzPekwJUD5QKZlaw/bURTLmS2id5wWi3lqVH4 BVF2WzvGyyeV1o4RTCYDnZ9VLLylJ9bneEaIs/7cjCEbipGGFlfIML3sfqnIvMAxIMZrvcl9 qPV2k+KQ7q+aXavU5W+yLNn7QtXUB530Zlk/d2ETgzQ5FLYYnUDAaRl+8JUTjc0CNOTpCeik 80TZcE6f8M76Xa6yU8VcNko94Ck7iB4vj70q76P/J7kt98hklrr85/3NU3oti3nrIHmHABEB AAG0KE5laWwgQXJtc3Ryb25nIDxuYXJtc3Ryb25nQGJheWxpYnJlLmNvbT6JATsEEwEKACUC GyMGCwkIBwMCBhUIAgkKCwQWAgMBAh4BAheABQJXDO2CAhkBAAoJEBaat7Gkz/iubGIH/iyk RqvgB62oKOFlgOTYCMkYpm2aAOZZLf6VKHKc7DoVwuUkjHfIRXdslbrxi4pk5VKU6ZP9AKsN NtMZntB8WrBTtkAZfZbTF7850uwd3eU5cN/7N1Q6g0JQihE7w4GlIkEpQ8vwSg5W7hkx3yQ6 2YzrUZh/b7QThXbNZ7xOeSEms014QXazx8+txR7jrGF3dYxBsCkotO/8DNtZ1R+aUvRfpKg5 ZgABTC0LmAQnuUUf2PHcKFAHZo5KrdO+tyfL+LgTUXIXkK+tenkLsAJ0cagz1EZ5gntuheLD YJuzS4zN+1Asmb9kVKxhjSQOcIh6g2tw7vaYJgL/OzJtZi6JlIW5AQ0ETVkGzwEIALyKDN/O GURaHBVzwjgYq+ZtifvekdrSNl8TIDH8g1xicBYpQTbPn6bbSZbdvfeQPNCcD4/EhXZuhQXM coJsQQQnO4vwVULmPGgtGf8PVc7dxKOeta+qUh6+SRh3vIcAUFHDT3f/Zdspz+e2E0hPV2hi SvICLk11qO6cyJE13zeNFoeY3ggrKY+IzbFomIZY4yG6xI99NIPEVE9lNBXBKIlewIyVlkOa YvJWSV+p5gdJXOvScNN1epm5YHmf9aE2ZjnqZGoMMtsyw18YoX9BqMFInxqYQQ3j/HpVgTSv mo5ea5qQDDUaCsaTf8UeDcwYOtgI8iL4oHcsGtUXoUk33HEAEQEAAYkBHwQYAQIACQUCTVkG zwIbDAAKCRAWmrexpM/4rrXiB/sGbkQ6itMrAIfnM7IbRuiSZS1unlySUVYu3SD6YBYnNi3G 5EpbwfBNuT3H8//rVvtOFK4OD8cRYkxXRQmTvqa33eDIHu/zr1HMKErm+2SD6PO9umRef8V8 2o2oaCLvf4WeIssFjwB0b6a12opuRP7yo3E3gTCSKmbUuLv1CtxKQF+fUV1cVaTPMyT25Od+ RC1K+iOR0F54oUJvJeq7fUzbn/KdlhA8XPGzwGRy4zcsPWvwnXgfe5tk680fEKZVwOZKIEuJ C3v+/yZpQzDvGYJvbyix0lHnrCzq43WefRHI5XTTQbM0WUIBIcGmq38+OgUsMYu4NzLu7uZF Acmp6h8guQINBFYnf6QBEADQ+wBYa+X2n/xIQz/RUoGHf84Jm+yTqRT43t7sO48/cBW9vAn9 GNwnJ3HRJWKATW0ZXrCr40ES/JqM1fUTfiFDB3VMdWpEfwOAT1zXS+0rX8yljgsWR1UvqyEP 3xN0M/40Zk+rdmZKaZS8VQaXbveaiWMEmY7sBV3QvgOzB7UF2It1HwoCon5Y+PvyE3CguhBd 9iq5iEampkMIkbA3FFCpQFI5Ai3BywkLzbA3ZtnMXR8Qt9gFZtyXvFQrB+/6hDzEPnBGZOOx zkd/iIX59SxBuS38LMlhPPycbFNmtauOC0DNpXCv9ACgC9tFw3exER/xQgSpDVc4vrL2Cacr wmQp1k9E0W+9pk/l8S1jcHx03hgCxPtQLOIyEu9iIJb27TjcXNjiInd7Uea195NldIrndD+x 58/yU3X70qVY+eWbqzpdlwF1KRm6uV0ZOQhEhbi0FfKKgsYFgBIBchGqSOBsCbL35f9hK/JC 6LnGDtSHeJs+jd9/qJj4WqF3x8i0sncQ/gszSajdhnWrxraG3b7/9ldMLpKo/OoihfLaCxtv xYmtw8TGhlMaiOxjDrohmY1z7f3rf6njskoIXUO0nabun1nPAiV1dpjleg60s3OmVQeEpr3a K7gR1ljkemJzM9NUoRROPaT7nMlNYQL+IwuthJd6XQqwzp1jRTGG26J97wARAQABiQM+BBgB AgAJBQJWJ3+kAhsCAikJEBaat7Gkz/iuwV0gBBkBAgAGBQJWJ3+kAAoJEHfc29rIyEnRk6MQ AJDo0nxsadLpYB26FALZsWlN74rnFXth5dQVQ7SkipmyFWZhFL8fQ9OiIoxWhM6rSg9+C1w+ n45eByMg2b8H3mmQmyWztdI95OxSREKwbaXVapCcZnv52JRjlc3DoiiHqTZML5x1Z7lQ1T3F 8o9sKrbFO1WQw1+Nc91+MU0MGN0jtfZ0Tvn/ouEZrSXCE4K3oDGtj3AdC764yZVq6CPigCgs 6Ex80k6QlzCdVP3RKsnPO2xQXXPgyJPJlpD8bHHHW7OLfoR9DaBNympfcbQJeekQrTvyoASw EOTPKE6CVWrcQIztUp0WFTdRGgMK0cZB3Xfe6sOp24PQTHAKGtjTHNP/THomkH24Fum9K3iM /4Wh4V2eqGEgpdeSp5K+LdaNyNgaqzMOtt4HYk86LYLSHfFXywdlbGrY9+TqiJ+ZVW4trmui NIJCOku8SYansq34QzYM0x3UFRwff+45zNBEVzctSnremg1mVgrzOfXU8rt+4N1b2MxorPF8 619aCwVP7U16qNSBaqiAJr4e5SNEnoAq18+1Gp8QsFG0ARY8xp+qaKBByWES7lRi3QbqAKZf yOHS6gmYo9gBmuAhc65/VtHMJtxwjpUeN4Bcs9HUpDMDVHdfeRa73wM+wY5potfQ5zkSp0Jp bxnv/cRBH6+c43stTffprd//4Hgz+nJcCgZKtCYIAPkUxABC85ID2CidzbraErVACmRoizhT KR2OiqSLW2x4xdmSiFNcIWkWJB6Qdri0Fzs2dHe8etD1HYaht1ZhZ810s7QOL7JwypO8dscN KTEkyoTGn6cWj0CX+PeP4xp8AR8ot4d0BhtUY34UPzjE1/xyrQFAdnLd0PP4wXxdIUuRs0+n WLY9Aou/vC1LAdlaGsoTVzJ2gX4fkKQIWhX0WVk41BSFeDKQ3RQ2pnuzwedLO94Bf6X0G48O VsbXrP9BZ6snXyHfebPnno/te5XRqZTL9aJOytB/1iUna+1MAwBxGFPvqeEUUyT+gx1l3Acl ZaTUOEkgIor5losDrePdPgE= Organization: Baylibre Message-ID: Date: Mon, 27 May 2019 14:37:05 +0200 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:60.0) Gecko/20100101 Thunderbird/60.6.1 MIME-Version: 1.0 In-Reply-To: <20190526194120.uzuq6ncz5l2z4hfm@pengutronix.de> Content-Type: text/plain; charset=utf-8 Content-Language: en-US Content-Transfer-Encoding: 8bit Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On 26/05/2019 21:41, Uwe Kleine-König wrote: > On Sat, May 25, 2019 at 08:11:29PM +0200, Martin Blumenstingl wrote: >> Replace the loop to calculate the pre-divider and count with two >> separate div64_u64() calculations. This makes the code easier to read >> and improves the precision. >> >> Two example cases: >> 1) 32.768kHz LPO clock for the SDIO wifi chip on Khadas VIM >> clock input: 500MHz (FCLK_DIV4) >> period: 30518ns >> duty cycle: 15259ns >> old algorithm: pre_div=0, cnt=15259 >> new algorithm: pre_div=0, cnt=15259 >> (no difference in calculated values) >> >> 2) PWM LED on Khadas VIM >> clock input: 24MHz (XTAL) >> period: 7812500ns >> duty cycle: 7812500ns >> old algorithm: pre_div=2, cnt=62004 >> new algorithm: pre_div=2, cnt=62500 >> Using a scope (24MHz sampling rate) shows the actual difference: >> - old: 7753000ns, off by -59500ns (0.7616%) >> - new: 7815000ns, off by +2500ns (0.032%) >> >> Suggested-by: Uwe Kleine-König >> Signed-off-by: Martin Blumenstingl >> --- >> drivers/pwm/pwm-meson.c | 25 ++++++++++--------------- >> 1 file changed, 10 insertions(+), 15 deletions(-) >> >> diff --git a/drivers/pwm/pwm-meson.c b/drivers/pwm/pwm-meson.c >> index 27915d6475e3..9afa1e5aaebf 100644 >> --- a/drivers/pwm/pwm-meson.c >> +++ b/drivers/pwm/pwm-meson.c >> @@ -12,6 +12,7 @@ >> #include >> #include >> #include >> +#include >> #include >> #include >> #include >> @@ -145,7 +146,6 @@ static int meson_pwm_calc(struct meson_pwm *meson, struct pwm_device *pwm, >> struct meson_pwm_channel *channel = pwm_get_chip_data(pwm); >> unsigned int duty, period, pre_div, cnt, duty_cnt; >> unsigned long fin_freq = -1; >> - u64 fin_ps; >> >> duty = state->duty_cycle; >> period = state->period; >> @@ -164,24 +164,19 @@ static int meson_pwm_calc(struct meson_pwm *meson, struct pwm_device *pwm, >> } >> >> dev_dbg(meson->chip.dev, "fin_freq: %lu Hz\n", fin_freq); >> - fin_ps = (u64)NSEC_PER_SEC * 1000; >> - do_div(fin_ps, fin_freq); >> - >> - /* Calc pre_div with the period */ >> - for (pre_div = 0; pre_div <= MISC_CLK_DIV_MASK; pre_div++) { >> - cnt = DIV_ROUND_CLOSEST_ULL((u64)period * 1000, >> - fin_ps * (pre_div + 1)); >> - dev_dbg(meson->chip.dev, "fin_ps=%llu pre_div=%u cnt=%u\n", >> - fin_ps, pre_div, cnt); >> - if (cnt <= 0xffff) >> - break; >> - } >> >> + pre_div = div64_u64(fin_freq * (u64)period, NSEC_PER_SEC * 0xffffLL); >> if (pre_div > MISC_CLK_DIV_MASK) { >> dev_err(meson->chip.dev, "unable to get period pre_div\n"); >> return -EINVAL; >> } >> >> + cnt = div64_u64(fin_freq * (u64)period, NSEC_PER_SEC * (pre_div + 1)); >> + if (cnt > 0xffff) { >> + dev_err(meson->chip.dev, "unable to get period cnt\n"); >> + return -EINVAL; >> + } >> + > > There is a slight modification in the calculation of pre_div that isn't > catched by the examples above. > > Before this patch we had: > > pick smallest pre_div such that > round_closest(period * 1000 / (round_down(1e12 / fin_freq) * (pre_div + 1)) <= 0xffff > > New approach is: > > pre_div = round_down(fin_freq * period / (1e9 * 0xffff)) > > An advantage of the new approach is better as it rounds only once and is > easier. > > Consider fin_freq = 99990001 and period = 655355, then the old algorithm > picks pre_div = 1 while the new picks pre_div = 0. > > I didn't continue here to check which are the resulting waveforms, I > assume they are different though. > > As there is currently no definition what is a "better" approximation for > a given requested pair (duty_cycle, period) I cannot say if these > changes are good or not. > > And that's a pity, so I still think there should be a documented > definition that lays down how a lowlevel driver should round. Without > that a consumer that cares about fine differences can not rely an the > abstraction provided by the PWM framework because each low-level driver > might behave differently. > > @Thierry: So can you please continue the discussion about this topic. > The longer this is delayed the more patches are created and submitted > that eventually might be wrong which is a waste of developer and > reviewer time. > > Assuming the people who care about meson don't object after reading this > I wouldn't want to stop this patch going in though. So: > > Acked-by: Uwe Kleine-König > > Best regards > Uwe > I don't have a strong view on this, Martin showed similar or much greater accuracy in the 2 principal use cases of the driver, so I'm ok with it. 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linux-kernel@vger.kernel.org, kernel@pengutronix.de, linux-pwm@vger.kernel.org Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: base64 Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+infradead-linux-arm-kernel=archiver.kernel.org@lists.infradead.org T24gMjYvMDUvMjAxOSAyMTo0MSwgVXdlIEtsZWluZS1Lw7ZuaWcgd3JvdGU6Cj4gT24gU2F0LCBN YXkgMjUsIDIwMTkgYXQgMDg6MTE6MjlQTSArMDIwMCwgTWFydGluIEJsdW1lbnN0aW5nbCB3cm90 ZToKPj4gUmVwbGFjZSB0aGUgbG9vcCB0byBjYWxjdWxhdGUgdGhlIHByZS1kaXZpZGVyIGFuZCBj b3VudCB3aXRoIHR3bwo+PiBzZXBhcmF0ZSBkaXY2NF91NjQoKSBjYWxjdWxhdGlvbnMuIFRoaXMg bWFrZXMgdGhlIGNvZGUgZWFzaWVyIHRvIHJlYWQKPj4gYW5kIGltcHJvdmVzIHRoZSBwcmVjaXNp b24uCj4+Cj4+IFR3byBleGFtcGxlIGNhc2VzOgo+PiAxKSAzMi43NjhrSHogTFBPIGNsb2NrIGZv ciB0aGUgU0RJTyB3aWZpIGNoaXAgb24gS2hhZGFzIFZJTQo+PiAgICBjbG9jayBpbnB1dDogNTAw TUh6IChGQ0xLX0RJVjQpCj4+ICAgIHBlcmlvZDogMzA1MThucwo+PiAgICBkdXR5IGN5Y2xlOiAx NTI1OW5zCj4+IG9sZCBhbGdvcml0aG06IHByZV9kaXY9MCwgY250PTE1MjU5Cj4+IG5ldyBhbGdv 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linux-kernel@vger.kernel.org, kernel@pengutronix.de, linux-pwm@vger.kernel.org Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: base64 Sender: "linux-amlogic" Errors-To: linux-amlogic-bounces+linux-amlogic=archiver.kernel.org@lists.infradead.org T24gMjYvMDUvMjAxOSAyMTo0MSwgVXdlIEtsZWluZS1Lw7ZuaWcgd3JvdGU6Cj4gT24gU2F0LCBN YXkgMjUsIDIwMTkgYXQgMDg6MTE6MjlQTSArMDIwMCwgTWFydGluIEJsdW1lbnN0aW5nbCB3cm90 ZToKPj4gUmVwbGFjZSB0aGUgbG9vcCB0byBjYWxjdWxhdGUgdGhlIHByZS1kaXZpZGVyIGFuZCBj b3VudCB3aXRoIHR3bwo+PiBzZXBhcmF0ZSBkaXY2NF91NjQoKSBjYWxjdWxhdGlvbnMuIFRoaXMg bWFrZXMgdGhlIGNvZGUgZWFzaWVyIHRvIHJlYWQKPj4gYW5kIGltcHJvdmVzIHRoZSBwcmVjaXNp b24uCj4+Cj4+IFR3byBleGFtcGxlIGNhc2VzOgo+PiAxKSAzMi43NjhrSHogTFBPIGNsb2NrIGZv ciB0aGUgU0RJTyB3aWZpIGNoaXAgb24gS2hhZGFzIFZJTQo+PiAgICBjbG9jayBpbnB1dDogNTAw TUh6IChGQ0xLX0RJVjQpCj4+ICAgIHBlcmlvZDogMzA1MThucwo+PiAgICBkdXR5IGN5Y2xlOiAx NTI1OW5zCj4+IG9sZCBhbGdvcml0aG06IHByZV9kaXY9MCwgY250PTE1MjU5Cj4+IG5ldyBhbGdv 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