All of lore.kernel.org
 help / color / mirror / Atom feed
From: "Michał Mirosław" <mirq-linux@rere.qmqm.pl>
To: Suneel Garapati <suneel.garapati@xilinx.com>,
	Kevin Liu <kliu5@marvell.com>,
	Ulf Hansson <ulf.hansson@linaro.org>
Cc: Adrian Hunter <adrian.hunter@intel.com>,
	Chris Ball <cjb@laptop.org>,
	linux-arm-kernel@lists.infradead.org,
	linux-kernel@vger.kernel.org, linux-mmc@vger.kernel.org,
	Michal Simek <michal.simek@xilinx.com>
Subject: [PATCH v3 3/5] mmc: sdhci: fix SDHCI_QUIRK2_CLOCK_DIV_ZERO_BROKEN
Date: Sun, 25 Jul 2021 06:25:16 +0200	[thread overview]
Message-ID: <198e2af8eb70212cdd6d85d7fb8ff547e295fa77.1627186831.git.mirq-linux@rere.qmqm.pl> (raw)
In-Reply-To: <cover.1627186831.git.mirq-linux@rere.qmqm.pl>

Fix returned clock rate for SDHCI_QUIRK2_CLOCK_DIV_ZERO_BROKEN case.
This fixes real_div value that was calculated as 1 (meaning no division)
instead of 2 with the quirk enabled.

Cc: stable@kernel.vger.org
Fixes: d1955c3a9a1d ("mmc: sdhci: add quirk SDHCI_QUIRK_CLOCK_DIV_ZERO_BROKEN")
Signed-off-by: Michał Mirosław <mirq-linux@rere.qmqm.pl>
---
v3: updated commit message
v2: no changes
---
 drivers/mmc/host/sdhci.c | 10 +++++-----
 1 file changed, 5 insertions(+), 5 deletions(-)

diff --git a/drivers/mmc/host/sdhci.c b/drivers/mmc/host/sdhci.c
index 3ab60e7f936b..0993f7d0ce8e 100644
--- a/drivers/mmc/host/sdhci.c
+++ b/drivers/mmc/host/sdhci.c
@@ -1903,9 +1903,12 @@ u16 sdhci_calc_clk(struct sdhci_host *host, unsigned int clock,
 
 		if (!host->clk_mul || switch_base_clk) {
 			/* Version 3.00 divisors must be a multiple of 2. */
-			if (host->max_clk <= clock)
+			if (host->max_clk <= clock) {
 				div = 1;
-			else {
+				if ((host->quirks2 & SDHCI_QUIRK2_CLOCK_DIV_ZERO_BROKEN)
+					&& host->max_clk <= 25000000)
+					div = 2;
+			} else {
 				for (div = 2; div < SDHCI_MAX_DIV_SPEC_300;
 				     div += 2) {
 					if ((host->max_clk / div) <= clock)
@@ -1914,9 +1917,6 @@ u16 sdhci_calc_clk(struct sdhci_host *host, unsigned int clock,
 			}
 			real_div = div;
 			div >>= 1;
-			if ((host->quirks2 & SDHCI_QUIRK2_CLOCK_DIV_ZERO_BROKEN)
-				&& !div && host->max_clk <= 25000000)
-				div = 1;
 		}
 	} else {
 		/* Version 2.00 divisors must be a power of 2. */
-- 
2.30.2


WARNING: multiple messages have this Message-ID (diff)
From: "Michał Mirosław" <mirq-linux@rere.qmqm.pl>
To: Suneel Garapati <suneel.garapati@xilinx.com>,
	Kevin Liu <kliu5@marvell.com>,
	Ulf Hansson <ulf.hansson@linaro.org>
Cc: Adrian Hunter <adrian.hunter@intel.com>,
	Chris Ball <cjb@laptop.org>,
	linux-arm-kernel@lists.infradead.org,
	linux-kernel@vger.kernel.org, linux-mmc@vger.kernel.org,
	Michal Simek <michal.simek@xilinx.com>
Subject: [PATCH v3 3/5] mmc: sdhci: fix SDHCI_QUIRK2_CLOCK_DIV_ZERO_BROKEN
Date: Sun, 25 Jul 2021 06:25:16 +0200	[thread overview]
Message-ID: <198e2af8eb70212cdd6d85d7fb8ff547e295fa77.1627186831.git.mirq-linux@rere.qmqm.pl> (raw)
In-Reply-To: <cover.1627186831.git.mirq-linux@rere.qmqm.pl>

Fix returned clock rate for SDHCI_QUIRK2_CLOCK_DIV_ZERO_BROKEN case.
This fixes real_div value that was calculated as 1 (meaning no division)
instead of 2 with the quirk enabled.

Cc: stable@kernel.vger.org
Fixes: d1955c3a9a1d ("mmc: sdhci: add quirk SDHCI_QUIRK_CLOCK_DIV_ZERO_BROKEN")
Signed-off-by: Michał Mirosław <mirq-linux@rere.qmqm.pl>
---
v3: updated commit message
v2: no changes
---
 drivers/mmc/host/sdhci.c | 10 +++++-----
 1 file changed, 5 insertions(+), 5 deletions(-)

diff --git a/drivers/mmc/host/sdhci.c b/drivers/mmc/host/sdhci.c
index 3ab60e7f936b..0993f7d0ce8e 100644
--- a/drivers/mmc/host/sdhci.c
+++ b/drivers/mmc/host/sdhci.c
@@ -1903,9 +1903,12 @@ u16 sdhci_calc_clk(struct sdhci_host *host, unsigned int clock,
 
 		if (!host->clk_mul || switch_base_clk) {
 			/* Version 3.00 divisors must be a multiple of 2. */
-			if (host->max_clk <= clock)
+			if (host->max_clk <= clock) {
 				div = 1;
-			else {
+				if ((host->quirks2 & SDHCI_QUIRK2_CLOCK_DIV_ZERO_BROKEN)
+					&& host->max_clk <= 25000000)
+					div = 2;
+			} else {
 				for (div = 2; div < SDHCI_MAX_DIV_SPEC_300;
 				     div += 2) {
 					if ((host->max_clk / div) <= clock)
@@ -1914,9 +1917,6 @@ u16 sdhci_calc_clk(struct sdhci_host *host, unsigned int clock,
 			}
 			real_div = div;
 			div >>= 1;
-			if ((host->quirks2 & SDHCI_QUIRK2_CLOCK_DIV_ZERO_BROKEN)
-				&& !div && host->max_clk <= 25000000)
-				div = 1;
 		}
 	} else {
 		/* Version 2.00 divisors must be a power of 2. */
-- 
2.30.2


_______________________________________________
linux-arm-kernel mailing list
linux-arm-kernel@lists.infradead.org
http://lists.infradead.org/mailman/listinfo/linux-arm-kernel

  reply	other threads:[~2021-07-25  4:25 UTC|newest]

Thread overview: 17+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-07-25  4:25 [PATCH v3 0/5] SDHCI clock handling fixes and cleanups Michał Mirosław
2021-07-25  4:25 ` Michał Mirosław [this message]
2021-07-25  4:25   ` [PATCH v3 3/5] mmc: sdhci: fix SDHCI_QUIRK2_CLOCK_DIV_ZERO_BROKEN Michał Mirosław
2021-07-25  4:25 ` [PATCH v3 2/5] mmc: sdhci: always obey programmable clock config in preset value Michał Mirosław
2021-07-25  4:25   ` Michał Mirosław
2021-07-25  4:25 ` [PATCH v3 1/5] mmc: sdhci: fix base clock usage " Michał Mirosław
2021-07-25  4:25   ` Michał Mirosław
2021-07-25  4:25 ` [PATCH v3 4/5] mmc: sdhci: move SDHCI_QUIRK2_CLOCK_DIV_ZERO_BROKEN frequency limit Michał Mirosław
2021-07-25  4:25   ` Michał Mirosław
2021-07-25  9:05   ` kernel test robot
2021-07-25  9:05     ` kernel test robot
2021-07-25  9:05     ` kernel test robot
2021-07-25 19:16   ` kernel test robot
2021-07-25 19:16     ` kernel test robot
2021-07-25 19:16     ` kernel test robot
2021-07-25  4:25 ` [PATCH v3 5/5] mmc: sdhci: simplify v2/v3+ clock calculation Michał Mirosław
2021-07-25  4:25   ` Michał Mirosław

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=198e2af8eb70212cdd6d85d7fb8ff547e295fa77.1627186831.git.mirq-linux@rere.qmqm.pl \
    --to=mirq-linux@rere.qmqm.pl \
    --cc=adrian.hunter@intel.com \
    --cc=cjb@laptop.org \
    --cc=kliu5@marvell.com \
    --cc=linux-arm-kernel@lists.infradead.org \
    --cc=linux-kernel@vger.kernel.org \
    --cc=linux-mmc@vger.kernel.org \
    --cc=michal.simek@xilinx.com \
    --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 an external index of several public inboxes,
see mirroring instructions on how to clone and mirror
all data and code used by this external index.