mirror of
https://github.com/archlinuxarm/PKGBUILDs.git
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98 lines
2.9 KiB
Diff
98 lines
2.9 KiB
Diff
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From 9c2332f1376f5fb7c87f16dff77e9270eb7c91c8 Mon Sep 17 00:00:00 2001
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From: Matt Porter <mporter@ti.com>
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Date: Tue, 22 Nov 2011 10:48:32 -0500
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Subject: [PATCH 3/3] st7735fb: Make FB native endian on little endian platforms
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This is a quick unoptimized implementation of a shadow swap buffer
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which is engaged on little endian platforms. It's not DMA safe
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at this point nor is it particularly optimized during updates.
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This is ok atm since the point is to be compatible with all the
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user space code out there that assumes that all FBdevs are native
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endian.
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Now things like "cat foo.rgb565 > /dev/fb0" work as well as standard
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apps like fbv with no byte swapping mods.
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Signed-off-by: Matt Porter <mporter@ti.com>
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Signed-off-by: Koen Kooi <koen@dominion.thruhere.net>
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---
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drivers/video/st7735fb.c | 26 ++++++++++++++++++++------
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include/video/st7735fb.h | 1 +
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2 files changed, 21 insertions(+), 6 deletions(-)
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diff --git a/drivers/video/st7735fb.c b/drivers/video/st7735fb.c
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index 500cc88..69ad3d0 100644
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--- drivers.old/video/st7735fb.c
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+++ drivers/video/st7735fb.c
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@@ -244,7 +244,14 @@ static void st7735fb_update_display(struct st7735fb_par *par)
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{
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int ret = 0;
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u8 *vmem = par->info->screen_base;
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+#ifdef __LITTLE_ENDIAN
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+ int i;
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+ u16 *vmem16 = (u16 *)vmem;
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+ u16 *ssbuf = par->ssbuf;
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+ for (i=0; i<WIDTH*HEIGHT*BPP/8/2; i++)
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+ ssbuf[i] = swab16(vmem16[i]);
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+#endif
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/*
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TODO:
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Allow a subset of pages to be passed in
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@@ -261,7 +268,11 @@ static void st7735fb_update_display(struct st7735fb_par *par)
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st7735_write_cmd(par, ST7735_RAMWR);
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/* Blast framebuffer to ST7735 internal display RAM */
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+#ifdef __LITTLE_ENDIAN
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+ ret = st7735_write_data_buf(par, (u8 *)ssbuf, WIDTH*HEIGHT*BPP/8);
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+#else
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ret = st7735_write_data_buf(par, vmem, WIDTH*HEIGHT*BPP/8);
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+#endif
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if (ret < 0)
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pr_err("%s: spi_write failed to update display buffer\n",
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par->info->fix.id);
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@@ -417,12 +428,7 @@ static int __devinit st7735fb_probe (struct spi_device *spi)
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info->var.blue.length = 5;
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info->var.transp.offset = 0;
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info->var.transp.length = 0;
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- info->flags = FBINFO_FLAG_DEFAULT |
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-#ifdef __LITTLE_ENDIAN
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- FBINFO_FOREIGN_ENDIAN |
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-#endif
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- FBINFO_VIRTFB;
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-
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+ info->flags = FBINFO_FLAG_DEFAULT | FBINFO_VIRTFB;
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info->fbdefio = &st7735fb_defio;
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fb_deferred_io_init(info);
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@@ -432,6 +438,14 @@ static int __devinit st7735fb_probe (struct spi_device *spi)
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par->rst = pdata->rst_gpio;
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par->dc = pdata->dc_gpio;
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+#ifdef __LITTLE_ENDIAN
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+ /* Allocate swapped shadow buffer */
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+ vmem = vzalloc(vmem_size);
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+ if (!vmem)
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+ return retval;
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+ par->ssbuf = vmem;
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+#endif
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+
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retval = register_framebuffer(info);
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if (retval < 0)
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goto fbreg_fail;
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diff --git a/include/video/st7735fb.h b/include/video/st7735fb.h
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index 250f036..52f5182 100644
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--- include.orig/video/st7735fb.h
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+++ include/video/st7735fb.h
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@@ -34,6 +34,7 @@ enum st7735_cmd {
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struct st7735fb_par {
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struct spi_device *spi;
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struct fb_info *info;
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+ u16 *ssbuf;
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int rst;
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int dc;
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};
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--
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1.7.2.5
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