From: Adrian Hunter <adrian.hunter@intel.com>
To: "Michał Mirosław" <mirq-linux@rere.qmqm.pl>,
"Kevin Liu" <kliu5@marvell.com>,
"Michal Simek" <michal.simek@xilinx.com>,
"Suneel Garapati" <suneel.garapati@xilinx.com>,
"Ulf Hansson" <ulf.hansson@linaro.org>
Cc: linux-kernel@vger.kernel.org, linux-mmc@vger.kernel.org
Subject: Re: [PATCH 2/7] mmc: sdhci: fix programmable clock config from preset value
Date: Wed, 15 Apr 2020 15:44:20 +0300 [thread overview]
Message-ID: <94e170c9-e4cd-2109-667c-f6c81f65acd3@intel.com> (raw)
In-Reply-To: <0077b8bc2a4da024a3b985dd622674ebebe5b71b.1585827904.git.mirq-linux@rere.qmqm.pl>
On 2/04/20 2:54 pm, Michał Mirosław wrote:
> When host controller uses programmable clock presets but doesn't
> advertise programmable clock support, we can only guess what frequency
> it generates. Let's at least return correct SDHCI_PROG_CLOCK_MODE bit
> value in this case.
It sounds like the hardware is broken, so I tend to think a workaround
should be in the relevant vendor driver, because that is where
device-specific information really belongs.
>
> Fixes: 52983382c74f ("mmc: sdhci: enhance preset value function")
> Signed-off-by: Michał Mirosław <mirq-linux@rere.qmqm.pl>
> ---
> drivers/mmc/host/sdhci.c | 5 ++---
> 1 file changed, 2 insertions(+), 3 deletions(-)
>
> diff --git a/drivers/mmc/host/sdhci.c b/drivers/mmc/host/sdhci.c
> index 9aa3af5826df..b2dc4f1cfa5c 100644
> --- a/drivers/mmc/host/sdhci.c
> +++ b/drivers/mmc/host/sdhci.c
> @@ -1767,11 +1767,10 @@ u16 sdhci_calc_clk(struct sdhci_host *host, unsigned int clock,
>
> pre_val = sdhci_get_preset_value(host);
> div = FIELD_GET(SDHCI_PRESET_SDCLK_FREQ_MASK, pre_val);
> - if (host->clk_mul &&
> - (pre_val & SDHCI_PRESET_CLKGEN_SEL)) {
> + if (pre_val & SDHCI_PRESET_CLKGEN_SEL) {
> clk = SDHCI_PROG_CLOCK_MODE;
> real_div = div + 1;
> - clk_mul = host->clk_mul;
> + clk_mul = host->clk_mul ?: 1;
> } else {
> real_div = max_t(int, 1, div << 1);
> }
>
next prev parent reply other threads:[~2020-04-15 12:46 UTC|newest]
Thread overview: 26+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-04-02 11:54 [PATCH 0/7] SDHCI clock handling fixes and cleanups Michał Mirosław
2020-04-02 11:54 ` [PATCH 3/7] mmc: sdhci: fix SDHCI_QUIRK2_CLOCK_DIV_ZERO_BROKEN Michał Mirosław
2020-04-15 13:06 ` Adrian Hunter
2020-04-15 16:03 ` Michał Mirosław
2020-04-16 7:40 ` Adrian Hunter
2020-04-02 11:54 ` [PATCH 2/7] mmc: sdhci: fix programmable clock config from preset value Michał Mirosław
2020-04-15 12:44 ` Adrian Hunter [this message]
2020-04-02 11:54 ` [PATCH 1/7] mmc: sdhci: fix base clock usage in " Michał Mirosław
2020-04-15 12:25 ` Adrian Hunter
2020-04-15 16:28 ` Michał Mirosław
2020-04-16 8:26 ` Adrian Hunter
2020-04-17 13:55 ` Alan Cooper
2020-04-20 5:31 ` Adrian Hunter
2020-04-02 11:54 ` [PATCH 4/7] mmc: sdhci: move SDHCI_QUIRK2_CLOCK_DIV_ZERO_BROKEN frequency limit Michał Mirosław
2020-04-15 13:16 ` Adrian Hunter
2020-04-15 16:16 ` Michał Mirosław
2020-04-16 7:43 ` Adrian Hunter
2020-04-02 11:54 ` [PATCH 6/7] mmc: sdhci: squash v2/v3+ clock calculation differences Michał Mirosław
2020-04-02 11:54 ` [PATCH 5/7] mmc: sdhci: simplify clock frequency calculation Michał Mirosław
2020-04-03 13:02 ` kbuild test robot
2020-04-03 16:15 ` Michał Mirosław
2020-04-15 13:54 ` Adrian Hunter
2020-04-15 16:45 ` Michał Mirosław
2020-04-02 11:54 ` [PATCH 7/7] mmc: sdhci: respect non-zero div quirk in programmable clock mode Michał Mirosław
2020-04-03 16:03 ` kbuild test robot
2020-04-15 8:52 ` [PATCH 0/7] SDHCI clock handling fixes and cleanups Ulf Hansson
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=94e170c9-e4cd-2109-667c-f6c81f65acd3@intel.com \
--to=adrian.hunter@intel.com \
--cc=kliu5@marvell.com \
--cc=linux-kernel@vger.kernel.org \
--cc=linux-mmc@vger.kernel.org \
--cc=michal.simek@xilinx.com \
--cc=mirq-linux@rere.qmqm.pl \
--cc=suneel.garapati@xilinx.com \
--cc=ulf.hansson@linaro.org \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).