linux-kernel - [PATCH v3 3/3] drm/tilcdc: fix pixel clock setting warning message

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Message-Id: <20210322213337.26667-4-dariobin@libero.it>
Date:   Mon, 22 Mar 2021 22:33:37 +0100
From:   Dario Binacchi <dariobin@...ero.it>
To:     linux-kernel@...r.kernel.org
Cc:     Dario Binacchi <dariobin@...ero.it>,
        Daniel Vetter <daniel@...ll.ch>,
        David Airlie <airlied@...ux.ie>,
        Jyri Sarha <jyri.sarha@....fi>,
        Tomi Valkeinen <tomba@...nel.org>,
        dri-devel@...ts.freedesktop.org
Subject: [PATCH v3 3/3] drm/tilcdc: fix pixel clock setting warning message

The warning message did not printed the LCD pixel clock rate but the LCD
clock divisor input rate. As a consequence, the required and real pixel
clock rates are now passed to the tilcdc_pclk_diff().

Signed-off-by: Dario Binacchi <dariobin@...ero.it>

---

Changes in v3:
- Replace calculated with requested in the warning message.
- Swap the positions of the real_pclk_rate, and pclk_rate parameters
  in the warning message.

Changes in v2:
- The patch has been added in version 2.

 drivers/gpu/drm/tilcdc/tilcdc_crtc.c | 10 +++++-----
 1 file changed, 5 insertions(+), 5 deletions(-)

diff --git a/drivers/gpu/drm/tilcdc/tilcdc_crtc.c b/drivers/gpu/drm/tilcdc/tilcdc_crtc.c
index ac6228cb04d9..381a706ab7c2 100644
--- a/drivers/gpu/drm/tilcdc/tilcdc_crtc.c
+++ b/drivers/gpu/drm/tilcdc/tilcdc_crtc.c
@@ -203,7 +203,7 @@ static void tilcdc_crtc_set_clk(struct drm_crtc *crtc)
 	struct drm_device *dev = crtc->dev;
 	struct tilcdc_drm_private *priv = dev->dev_private;
 	struct tilcdc_crtc *tilcdc_crtc = to_tilcdc_crtc(crtc);
-	unsigned long clk_rate, real_rate, real_pclk_rate, pclk_rate;
+	unsigned long clk_rate, real_pclk_rate, pclk_rate;
 	unsigned int clkdiv;
 	int ret;
 
@@ -239,12 +239,12 @@ static void tilcdc_crtc_set_clk(struct drm_crtc *crtc)
 		 * 5% is an arbitrary value - LCDs are usually quite tolerant
 		 * about pixel clock rates.
 		 */
-		real_rate = clkdiv * pclk_rate;
+		real_pclk_rate = clk_rate / clkdiv;
 
-		if (tilcdc_pclk_diff(clk_rate, real_rate) > 5) {
+		if (tilcdc_pclk_diff(pclk_rate, real_pclk_rate) > 5) {
 			dev_warn(dev->dev,
-				 "effective pixel clock rate (%luHz) differs from the calculated rate (%luHz)\n",
-				 clk_rate, real_rate);
+				 "effective pixel clock rate (%luHz) differs from the requested rate (%luHz)\n",
+				 real_pclk_rate, pclk_rate);
 		}
 	}
 
-- 
2.17.1