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b=uv7Lm/X9X5z1ZUSUWfoS0ttfd/72rpm6SUnpRRaNa24NwI+up88M2sXcGcvi9f9YN Jig10wMsHnHwV3wanec2UWaKwWicjrcIw9dzuHtmOHhcc7uYxFsB3ysm6RbjCzKe6y jFKr94t1wofL3qvT2jXHDt0cZ9TG2LvhthtFoXo8mnq8bJQBPmuOH+d043V2q04tZW 98zrHAAMKuh6hEZvYg4S/n02z1WyFyc8uh7Y4DQZO2og/ahv9LdqCGSLBmonIYf9hv V9kuUDEqBFP9SD9NKttW20YDJR+hHD4daPmB+e6xNuANLo3Bwgo7cs0+9iYR4UQ95k jIktZ299+OK9Q== Received: from smtp.sberdevices.ru (p-i-exch-sc-m02.sberdevices.ru [172.16.192.103]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mx1.sberdevices.ru (Postfix) with ESMTPS; Sun, 17 Mar 2024 17:17:55 +0300 (MSK) Received: from [172.28.160.49] (100.64.160.123) by p-i-exch-sc-m02.sberdevices.ru (172.16.192.103) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.2.1118.40; Sun, 17 Mar 2024 17:17:55 +0300 Message-ID: Date: Sun, 17 Mar 2024 17:17:12 +0300 Precedence: bulk X-Mailing-List: devicetree@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH 01/25] clk: meson: a1: restrict an amount of 'hifi_pll' params Content-Language: en-US To: Jerome Brunet CC: Neil Armstrong , Michael Turquette , Stephen Boyd , Rob Herring , Krzysztof Kozlowski , Conor Dooley , Philipp Zabel , Kevin Hilman , Martin Blumenstingl , Liam Girdwood , Mark Brown , Linus Walleij , Jaroslav Kysela , Takashi Iwai , , , , , , , , , References: <20240314232201.2102178-1-jan.dakinevich@salutedevices.com> <20240314232201.2102178-2-jan.dakinevich@salutedevices.com> <1j8r2jj24k.fsf@starbuckisacylon.baylibre.com> From: Jan Dakinevich In-Reply-To: <1j8r2jj24k.fsf@starbuckisacylon.baylibre.com> Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: 7bit X-ClientProxiedBy: p-i-exch-sc-m02.sberdevices.ru (172.16.192.103) To p-i-exch-sc-m02.sberdevices.ru (172.16.192.103) X-KSMG-Rule-ID: 10 X-KSMG-Message-Action: clean X-KSMG-AntiSpam-Lua-Profiles: 183875 [Feb 29 2024] X-KSMG-AntiSpam-Version: 6.1.0.3 X-KSMG-AntiSpam-Envelope-From: YVDakinevich@sberdevices.ru X-KSMG-AntiSpam-Rate: 0 X-KSMG-AntiSpam-Status: not_detected X-KSMG-AntiSpam-Method: none X-KSMG-AntiSpam-Auth: dkim=none X-KSMG-AntiSpam-Info: LuaCore: 7 0.3.7 6d6bf5bd8eea7373134f756a2fd73e9456bb7d1a, {Tracking_smtp_not_equal_from}, {Tracking_from_domain_doesnt_match_to}, FromAlignment: n, {Tracking_smtp_domain_mismatch}, {Tracking_smtp_domain_2level_mismatch}, ApMailHostAddress: 100.64.160.123 X-MS-Exchange-Organization-SCL: -1 X-KSMG-AntiSpam-Interceptor-Info: scan successful X-KSMG-AntiPhishing: Clean X-KSMG-LinksScanning: Clean X-KSMG-AntiVirus: Kaspersky Secure Mail Gateway, version 2.0.1.6960, bases: 2024/02/29 19:21:00 #23899999 X-KSMG-AntiVirus-Status: Clean, skipped On 3/15/24 11:58, Jerome Brunet wrote: > > On Fri 15 Mar 2024 at 02:21, Jan Dakinevich wrote: > >> Existing values were insufficient to produce accurate clock for audio >> devices. New values are safe and most suitable to produce 48000Hz sample >> rate. > > The hifi pll is not about 48k only. I see no reason to restrict the PLL > to a single setting. > > You've provided no justification why the PLL driver can't reach the same > setting for 48k. The setting below is just the crude part. the fine > tuning is done done with the frac parameter so I doubt this provides a > more accurate rate. > You are right, it is not about 48k only. However, there are two issues. First, indeed, I could just extend the range of multipliers to 1..255. But I am unsure if hifi_pll is able to handle whole range of mulptipliers. The value 128 is taken from Amlogic's branch, and I am pretty sure that it works. Second, unfortunately frac parameter currently doesn't work. When frac is used enabling of hifi_pll fails in meson_clk_pll_wait_lock(). I see it when try to use 44100Hz and multipliers' range is set to 1..255. So, support of other rates than 48k requires extra effort. >> >> Signed-off-by: Jan Dakinevich >> --- >> drivers/clk/meson/a1-pll.c | 8 ++++---- >> 1 file changed, 4 insertions(+), 4 deletions(-) >> >> diff --git a/drivers/clk/meson/a1-pll.c b/drivers/clk/meson/a1-pll.c >> index 4325e8a6a3ef..00e06d03445b 100644 >> --- a/drivers/clk/meson/a1-pll.c >> +++ b/drivers/clk/meson/a1-pll.c >> @@ -74,9 +74,9 @@ static struct clk_regmap fixed_pll = { >> }, >> }; >> >> -static const struct pll_mult_range hifi_pll_mult_range = { >> - .min = 32, >> - .max = 64, >> +static const struct pll_params_table hifi_pll_params_table[] = { >> + PLL_PARAMS(128, 5), >> + { }, >> }; >> >> static const struct reg_sequence hifi_init_regs[] = { >> @@ -124,7 +124,7 @@ static struct clk_regmap hifi_pll = { >> .shift = 6, >> .width = 1, >> }, >> - .range = &hifi_pll_mult_range, >> + .table = hifi_pll_params_table, >> .init_regs = hifi_init_regs, >> .init_count = ARRAY_SIZE(hifi_init_regs), >> }, > > -- Best regards Jan Dakinevich