All of lore.kernel.org
 help / color / mirror / Atom feed
From: Sasha Levin <sashal@kernel.org>
To: linux-kernel@vger.kernel.org, stable@vger.kernel.org
Cc: Sasha Levin <sashal@kernel.org>,
	Leo Ruan <tingquan.ruan@cn.bosch.com>,
	airlied@linux.ie, dri-devel@lists.freedesktop.org,
	Mark Jonas <mark.jonas@de.bosch.com>
Subject: [PATCH AUTOSEL 4.9 5/7] gpu: ipu-v3: Fix dev_dbg frequency output
Date: Mon, 11 Apr 2022 20:52:46 -0400	[thread overview]
Message-ID: <20220412005248.351701-5-sashal@kernel.org> (raw)
In-Reply-To: <20220412005248.351701-1-sashal@kernel.org>

From: Leo Ruan <tingquan.ruan@cn.bosch.com>

[ Upstream commit 070a88fd4a03f921b73a2059e97d55faaa447dab ]

This commit corrects the printing of the IPU clock error percentage if
it is between -0.1% to -0.9%. For example, if the pixel clock requested
is 27.2 MHz but only 27.0 MHz can be achieved the deviation is -0.8%.
But the fixed point math had a flaw and calculated error of 0.2%.

Before:
  Clocks: IPU 270000000Hz DI 24716667Hz Needed 27200000Hz
  IPU clock can give 27000000 with divider 10, error 0.2%
  Want 27200000Hz IPU 270000000Hz DI 24716667Hz using IPU, 27000000Hz

After:
  Clocks: IPU 270000000Hz DI 24716667Hz Needed 27200000Hz
  IPU clock can give 27000000 with divider 10, error -0.8%
  Want 27200000Hz IPU 270000000Hz DI 24716667Hz using IPU, 27000000Hz

Signed-off-by: Leo Ruan <tingquan.ruan@cn.bosch.com>
Signed-off-by: Mark Jonas <mark.jonas@de.bosch.com>
Reviewed-by: Philipp Zabel <p.zabel@pengutronix.de>
Signed-off-by: Philipp Zabel <p.zabel@pengutronix.de>
Link: https://lore.kernel.org/r/20220207151411.5009-1-mark.jonas@de.bosch.com
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
 drivers/gpu/ipu-v3/ipu-di.c | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/drivers/gpu/ipu-v3/ipu-di.c b/drivers/gpu/ipu-v3/ipu-di.c
index a8d87ddd8a17..dc0511b22600 100644
--- a/drivers/gpu/ipu-v3/ipu-di.c
+++ b/drivers/gpu/ipu-v3/ipu-di.c
@@ -460,8 +460,9 @@ static void ipu_di_config_clock(struct ipu_di *di,
 
 		error = rate / (sig->mode.pixelclock / 1000);
 
-		dev_dbg(di->ipu->dev, "  IPU clock can give %lu with divider %u, error %d.%u%%\n",
-			rate, div, (signed)(error - 1000) / 10, error % 10);
+		dev_dbg(di->ipu->dev, "  IPU clock can give %lu with divider %u, error %c%d.%d%%\n",
+			rate, div, error < 1000 ? '-' : '+',
+			abs(error - 1000) / 10, abs(error - 1000) % 10);
 
 		/* Allow a 1% error */
 		if (error < 1010 && error >= 990) {
-- 
2.35.1


WARNING: multiple messages have this Message-ID (diff)
From: Sasha Levin <sashal@kernel.org>
To: linux-kernel@vger.kernel.org, stable@vger.kernel.org
Cc: Leo Ruan <tingquan.ruan@cn.bosch.com>,
	Mark Jonas <mark.jonas@de.bosch.com>,
	Philipp Zabel <p.zabel@pengutronix.de>,
	Sasha Levin <sashal@kernel.org>,
	airlied@linux.ie, daniel@ffwll.ch,
	dri-devel@lists.freedesktop.org
Subject: [PATCH AUTOSEL 4.9 5/7] gpu: ipu-v3: Fix dev_dbg frequency output
Date: Mon, 11 Apr 2022 20:52:46 -0400	[thread overview]
Message-ID: <20220412005248.351701-5-sashal@kernel.org> (raw)
In-Reply-To: <20220412005248.351701-1-sashal@kernel.org>

From: Leo Ruan <tingquan.ruan@cn.bosch.com>

[ Upstream commit 070a88fd4a03f921b73a2059e97d55faaa447dab ]

This commit corrects the printing of the IPU clock error percentage if
it is between -0.1% to -0.9%. For example, if the pixel clock requested
is 27.2 MHz but only 27.0 MHz can be achieved the deviation is -0.8%.
But the fixed point math had a flaw and calculated error of 0.2%.

Before:
  Clocks: IPU 270000000Hz DI 24716667Hz Needed 27200000Hz
  IPU clock can give 27000000 with divider 10, error 0.2%
  Want 27200000Hz IPU 270000000Hz DI 24716667Hz using IPU, 27000000Hz

After:
  Clocks: IPU 270000000Hz DI 24716667Hz Needed 27200000Hz
  IPU clock can give 27000000 with divider 10, error -0.8%
  Want 27200000Hz IPU 270000000Hz DI 24716667Hz using IPU, 27000000Hz

Signed-off-by: Leo Ruan <tingquan.ruan@cn.bosch.com>
Signed-off-by: Mark Jonas <mark.jonas@de.bosch.com>
Reviewed-by: Philipp Zabel <p.zabel@pengutronix.de>
Signed-off-by: Philipp Zabel <p.zabel@pengutronix.de>
Link: https://lore.kernel.org/r/20220207151411.5009-1-mark.jonas@de.bosch.com
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
 drivers/gpu/ipu-v3/ipu-di.c | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/drivers/gpu/ipu-v3/ipu-di.c b/drivers/gpu/ipu-v3/ipu-di.c
index a8d87ddd8a17..dc0511b22600 100644
--- a/drivers/gpu/ipu-v3/ipu-di.c
+++ b/drivers/gpu/ipu-v3/ipu-di.c
@@ -460,8 +460,9 @@ static void ipu_di_config_clock(struct ipu_di *di,
 
 		error = rate / (sig->mode.pixelclock / 1000);
 
-		dev_dbg(di->ipu->dev, "  IPU clock can give %lu with divider %u, error %d.%u%%\n",
-			rate, div, (signed)(error - 1000) / 10, error % 10);
+		dev_dbg(di->ipu->dev, "  IPU clock can give %lu with divider %u, error %c%d.%d%%\n",
+			rate, div, error < 1000 ? '-' : '+',
+			abs(error - 1000) / 10, abs(error - 1000) % 10);
 
 		/* Allow a 1% error */
 		if (error < 1010 && error >= 990) {
-- 
2.35.1


  parent reply	other threads:[~2022-04-12  0:53 UTC|newest]

Thread overview: 11+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2022-04-12  0:52 [PATCH AUTOSEL 4.9 1/7] drm/amdkfd: Check for potential null return of kmalloc_array() Sasha Levin
2022-04-12  0:52 ` Sasha Levin
2022-04-12  0:52 ` Sasha Levin
2022-04-12  0:52 ` [PATCH AUTOSEL 4.9 2/7] scsi: lpfc: Fix queue failures when recovering from PCI parity error Sasha Levin
2022-04-16 20:01   ` Pavel Machek
2022-04-12  0:52 ` [PATCH AUTOSEL 4.9 3/7] scsi: ibmvscsis: Increase INITIAL_SRP_LIMIT to 1024 Sasha Levin
2022-04-12  0:52 ` [PATCH AUTOSEL 4.9 4/7] net: micrel: fix KS8851_MLL Kconfig Sasha Levin
2022-04-12  0:52 ` Sasha Levin [this message]
2022-04-12  0:52   ` [PATCH AUTOSEL 4.9 5/7] gpu: ipu-v3: Fix dev_dbg frequency output Sasha Levin
2022-04-12  0:52 ` [PATCH AUTOSEL 4.9 6/7] scsi: mvsas: Add PCI ID of RocketRaid 2640 Sasha Levin
2022-04-12  0:52 ` [PATCH AUTOSEL 4.9 7/7] drivers: net: slip: fix NPD bug in sl_tx_timeout() Sasha Levin

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=20220412005248.351701-5-sashal@kernel.org \
    --to=sashal@kernel.org \
    --cc=airlied@linux.ie \
    --cc=dri-devel@lists.freedesktop.org \
    --cc=linux-kernel@vger.kernel.org \
    --cc=mark.jonas@de.bosch.com \
    --cc=stable@vger.kernel.org \
    --cc=tingquan.ruan@cn.bosch.com \
    /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.