[v2] video: ARM CLCD: Fix calculation of bits-per-pixel

Message ID 1408538464.3858.43.camel@linaro1.home
State New
Headers show

Commit Message

Jon Medhurst (Tixy) Aug. 20, 2014, 12:41 p.m.
If the device-tree specifies a max-memory-bandwidth property then the
CLCD driver uses that to calculate the bits-per-pixel supported,
however, this calculation is faulty for two reasons.

1. It doesn't ensure that the result is a sane value, i.e. a power of 2
   and <= 32 as the rest of the code assumes.

2. It uses the displayed resolution and calculates the average bandwidth
   across the whole frame. It should instead calculate the peak
   bandwidth based on the pixel clock.

This patch fixes both the above.

Signed-off-by: Jon Medhurst <tixy@linaro.org>
---

Changes since v1:
- Changed formula for calculating bits per pixel
- Changed commit message and subject, was:
  "video: ARM CLCD: Ensure bits-per-pixel is a power of 2 and <= 32"

 drivers/video/fbdev/amba-clcd.c | 23 ++++++++++++++++++-----
 1 file changed, 18 insertions(+), 5 deletions(-)

Comments

Pawel Moll Aug. 20, 2014, 1:03 p.m. | #1
On Wed, 2014-08-20 at 13:41 +0100, Jon Medhurst (Tixy) wrote:
> If the device-tree specifies a max-memory-bandwidth property then the
> CLCD driver uses that to calculate the bits-per-pixel supported,
> however, this calculation is faulty for two reasons.
> 
> 1. It doesn't ensure that the result is a sane value, i.e. a power of 2
>    and <= 32 as the rest of the code assumes.
> 
> 2. It uses the displayed resolution and calculates the average bandwidth
>    across the whole frame. It should instead calculate the peak
>    bandwidth based on the pixel clock.
> 
> This patch fixes both the above.
> 
> Signed-off-by: Jon Medhurst <tixy@linaro.org>

Acked-by: Pawel Moll <pawel.moll@arm.com>

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Tomi Valkeinen Aug. 26, 2014, 9:52 a.m. | #2
On 20/08/14 15:41, Jon Medhurst (Tixy) wrote:
> If the device-tree specifies a max-memory-bandwidth property then the
> CLCD driver uses that to calculate the bits-per-pixel supported,
> however, this calculation is faulty for two reasons.
> 
> 1. It doesn't ensure that the result is a sane value, i.e. a power of 2
>    and <= 32 as the rest of the code assumes.
> 
> 2. It uses the displayed resolution and calculates the average bandwidth
>    across the whole frame. It should instead calculate the peak
>    bandwidth based on the pixel clock.
> 
> This patch fixes both the above.
> 
> Signed-off-by: Jon Medhurst <tixy@linaro.org>

Thanks, queued for 3.17 fbdev fixes.

 Tomi

Patch hide | download patch | download mbox

diff --git a/drivers/video/fbdev/amba-clcd.c b/drivers/video/fbdev/amba-clcd.c
index beadd3e..a7b6217 100644
--- a/drivers/video/fbdev/amba-clcd.c
+++ b/drivers/video/fbdev/amba-clcd.c
@@ -24,6 +24,7 @@ 
 #include <linux/list.h>
 #include <linux/amba/bus.h>
 #include <linux/amba/clcd.h>
+#include <linux/bitops.h>
 #include <linux/clk.h>
 #include <linux/hardirq.h>
 #include <linux/dma-mapping.h>
@@ -650,6 +651,7 @@  static int clcdfb_of_init_display(struct clcd_fb *fb)
 {
 	struct device_node *endpoint;
 	int err;
+	unsigned int bpp;
 	u32 max_bandwidth;
 	u32 tft_r0b0g0[3];
 
@@ -667,11 +669,22 @@  static int clcdfb_of_init_display(struct clcd_fb *fb)
 
 	err = of_property_read_u32(fb->dev->dev.of_node, "max-memory-bandwidth",
 			&max_bandwidth);
-	if (!err)
-		fb->panel->bpp = 8 * max_bandwidth / (fb->panel->mode.xres *
-				fb->panel->mode.yres * fb->panel->mode.refresh);
-	else
-		fb->panel->bpp = 32;
+	if (!err) {
+		/*
+		 * max_bandwidth is in bytes per second and pixclock in
+		 * pico-seconds, so the maximum allowed bits per pixel is
+		 *   8 * max_bandwidth / (PICOS2KHZ(pixclock) * 1000)
+		 * Rearrange this calculation to avoid overflow and then ensure
+		 * result is a valid format.
+		 */
+		bpp = max_bandwidth / (1000 / 8)
+			/ PICOS2KHZ(fb->panel->mode.pixclock);
+		bpp = rounddown_pow_of_two(bpp);
+		if (bpp > 32)
+			bpp = 32;
+	} else
+		bpp = 32;
+	fb->panel->bpp = bpp;
 
 #ifdef CONFIG_CPU_BIG_ENDIAN
 	fb->panel->cntl |= CNTL_BEBO;