diff options
Diffstat (limited to 'target/linux/brcm2708/patches-3.14/0024-Speed-up-console-framebuffer-imageblit-function.patch')
-rw-r--r-- | target/linux/brcm2708/patches-3.14/0024-Speed-up-console-framebuffer-imageblit-function.patch | 209 |
1 files changed, 0 insertions, 209 deletions
diff --git a/target/linux/brcm2708/patches-3.14/0024-Speed-up-console-framebuffer-imageblit-function.patch b/target/linux/brcm2708/patches-3.14/0024-Speed-up-console-framebuffer-imageblit-function.patch deleted file mode 100644 index ad7f303d50..0000000000 --- a/target/linux/brcm2708/patches-3.14/0024-Speed-up-console-framebuffer-imageblit-function.patch +++ /dev/null @@ -1,209 +0,0 @@ -From baadd46e587d311e40cfdcec7bdf691c8cce7fa9 Mon Sep 17 00:00:00 2001 -From: Harm Hanemaaijer <fgenfb@yahoo.com> -Date: Thu, 20 Jun 2013 20:21:39 +0200 -Subject: [PATCH 24/54] Speed up console framebuffer imageblit function - -Especially on platforms with a slower CPU but a relatively high -framebuffer fill bandwidth, like current ARM devices, the existing -console monochrome imageblit function used to draw console text is -suboptimal for common pixel depths such as 16bpp and 32bpp. The existing -code is quite general and can deal with several pixel depths. By creating -special case functions for 16bpp and 32bpp, by far the most common pixel -formats used on modern systems, a significant speed-up is attained -which can be readily felt on ARM-based devices like the Raspberry Pi -and the Allwinner platform, but should help any platform using the -fb layer. - -The special case functions allow constant folding, eliminating a number -of instructions including divide operations, and allow the use of an -unrolled loop, eliminating instructions with a variable shift size, -reducing source memory access instructions, and eliminating excessive -branching. These unrolled loops also allow much better code optimization -by the C compiler. The code that selects which optimized variant is used -is also simplified, eliminating integer divide instructions. - -The speed-up, measured by timing 'cat file.txt' in the console, varies -between 40% and 70%, when testing on the Raspberry Pi and Allwinner -ARM-based platforms, depending on font size and the pixel depth, with -the greater benefit for 32bpp. - -Signed-off-by: Harm Hanemaaijer <fgenfb@yahoo.com> ---- - drivers/video/cfbimgblt.c | 152 ++++++++++++++++++++++++++++++++++++++++++++-- - 1 file changed, 147 insertions(+), 5 deletions(-) - ---- a/drivers/video/cfbimgblt.c -+++ b/drivers/video/cfbimgblt.c -@@ -28,6 +28,11 @@ - * - * Also need to add code to deal with cards endians that are different than - * the native cpu endians. I also need to deal with MSB position in the word. -+ * Modified by Harm Hanemaaijer (fgenfb@yahoo.com) 2013: -+ * - Provide optimized versions of fast_imageblit for 16 and 32bpp that are -+ * significantly faster than the previous implementation. -+ * - Simplify the fast/slow_imageblit selection code, avoiding integer -+ * divides. - */ - #include <linux/module.h> - #include <linux/string.h> -@@ -262,6 +267,133 @@ static inline void fast_imageblit(const - } - } - -+/* -+ * Optimized fast_imageblit for bpp == 16. ppw = 2, bit_mask = 3 folded -+ * into the code, main loop unrolled. -+ */ -+ -+static inline void fast_imageblit16(const struct fb_image *image, -+ struct fb_info *p, u8 __iomem * dst1, -+ u32 fgcolor, u32 bgcolor) -+{ -+ u32 fgx = fgcolor, bgx = bgcolor; -+ u32 spitch = (image->width + 7) / 8; -+ u32 end_mask, eorx; -+ const char *s = image->data, *src; -+ u32 __iomem *dst; -+ const u32 *tab = NULL; -+ int i, j, k; -+ -+ tab = fb_be_math(p) ? cfb_tab16_be : cfb_tab16_le; -+ -+ fgx <<= 16; -+ bgx <<= 16; -+ fgx |= fgcolor; -+ bgx |= bgcolor; -+ -+ eorx = fgx ^ bgx; -+ k = image->width / 2; -+ -+ for (i = image->height; i--;) { -+ dst = (u32 __iomem *) dst1; -+ src = s; -+ -+ j = k; -+ while (j >= 4) { -+ u8 bits = *src; -+ end_mask = tab[(bits >> 6) & 3]; -+ FB_WRITEL((end_mask & eorx) ^ bgx, dst++); -+ end_mask = tab[(bits >> 4) & 3]; -+ FB_WRITEL((end_mask & eorx) ^ bgx, dst++); -+ end_mask = tab[(bits >> 2) & 3]; -+ FB_WRITEL((end_mask & eorx) ^ bgx, dst++); -+ end_mask = tab[bits & 3]; -+ FB_WRITEL((end_mask & eorx) ^ bgx, dst++); -+ src++; -+ j -= 4; -+ } -+ if (j != 0) { -+ u8 bits = *src; -+ end_mask = tab[(bits >> 6) & 3]; -+ FB_WRITEL((end_mask & eorx) ^ bgx, dst++); -+ if (j >= 2) { -+ end_mask = tab[(bits >> 4) & 3]; -+ FB_WRITEL((end_mask & eorx) ^ bgx, dst++); -+ if (j == 3) { -+ end_mask = tab[(bits >> 2) & 3]; -+ FB_WRITEL((end_mask & eorx) ^ bgx, dst); -+ } -+ } -+ } -+ dst1 += p->fix.line_length; -+ s += spitch; -+ } -+} -+ -+/* -+ * Optimized fast_imageblit for bpp == 32. ppw = 1, bit_mask = 1 folded -+ * into the code, main loop unrolled. -+ */ -+ -+static inline void fast_imageblit32(const struct fb_image *image, -+ struct fb_info *p, u8 __iomem * dst1, -+ u32 fgcolor, u32 bgcolor) -+{ -+ u32 fgx = fgcolor, bgx = bgcolor; -+ u32 spitch = (image->width + 7) / 8; -+ u32 end_mask, eorx; -+ const char *s = image->data, *src; -+ u32 __iomem *dst; -+ const u32 *tab = NULL; -+ int i, j, k; -+ -+ tab = cfb_tab32; -+ -+ eorx = fgx ^ bgx; -+ k = image->width; -+ -+ for (i = image->height; i--;) { -+ dst = (u32 __iomem *) dst1; -+ src = s; -+ -+ j = k; -+ while (j >= 8) { -+ u8 bits = *src; -+ end_mask = tab[(bits >> 7) & 1]; -+ FB_WRITEL((end_mask & eorx) ^ bgx, dst++); -+ end_mask = tab[(bits >> 6) & 1]; -+ FB_WRITEL((end_mask & eorx) ^ bgx, dst++); -+ end_mask = tab[(bits >> 5) & 1]; -+ FB_WRITEL((end_mask & eorx) ^ bgx, dst++); -+ end_mask = tab[(bits >> 4) & 1]; -+ FB_WRITEL((end_mask & eorx) ^ bgx, dst++); -+ end_mask = tab[(bits >> 3) & 1]; -+ FB_WRITEL((end_mask & eorx) ^ bgx, dst++); -+ end_mask = tab[(bits >> 2) & 1]; -+ FB_WRITEL((end_mask & eorx) ^ bgx, dst++); -+ end_mask = tab[(bits >> 1) & 1]; -+ FB_WRITEL((end_mask & eorx) ^ bgx, dst++); -+ end_mask = tab[bits & 1]; -+ FB_WRITEL((end_mask & eorx) ^ bgx, dst++); -+ src++; -+ j -= 8; -+ } -+ if (j != 0) { -+ u32 bits = (u32) * src; -+ while (j > 1) { -+ end_mask = tab[(bits >> 7) & 1]; -+ FB_WRITEL((end_mask & eorx) ^ bgx, dst++); -+ bits <<= 1; -+ j--; -+ } -+ end_mask = tab[(bits >> 7) & 1]; -+ FB_WRITEL((end_mask & eorx) ^ bgx, dst); -+ } -+ dst1 += p->fix.line_length; -+ s += spitch; -+ } -+} -+ - void cfb_imageblit(struct fb_info *p, const struct fb_image *image) - { - u32 fgcolor, bgcolor, start_index, bitstart, pitch_index = 0; -@@ -294,11 +426,21 @@ void cfb_imageblit(struct fb_info *p, co - bgcolor = image->bg_color; - } - -- if (32 % bpp == 0 && !start_index && !pitch_index && -- ((width & (32/bpp-1)) == 0) && -- bpp >= 8 && bpp <= 32) -- fast_imageblit(image, p, dst1, fgcolor, bgcolor); -- else -+ if (!start_index && !pitch_index) { -+ if (bpp == 32) -+ fast_imageblit32(image, p, dst1, fgcolor, -+ bgcolor); -+ else if (bpp == 16 && (width & 1) == 0) -+ fast_imageblit16(image, p, dst1, fgcolor, -+ bgcolor); -+ else if (bpp == 8 && (width & 3) == 0) -+ fast_imageblit(image, p, dst1, fgcolor, -+ bgcolor); -+ else -+ slow_imageblit(image, p, dst1, fgcolor, -+ bgcolor, -+ start_index, pitch_index); -+ } else - slow_imageblit(image, p, dst1, fgcolor, bgcolor, - start_index, pitch_index); - } else |