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authorAndy Shevchenko <andriy.shevchenko@linux.intel.com>2017-01-19 12:45:42 +0200
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2017-01-19 12:50:27 +0100
commit7c3eaadd0209fe21f331600ea2d904c3a0e9b287 (patch)
tree4d3ef83783af3ed0a263a61808e04dcd713ab63e /drivers
parent9ed2bfb3e39bfbe79ddcf2d03eef28242ea60253 (diff)
staging: fbtft: remove custom DMA mapped buffer
There is no need to duplicate what SPI core already does, i.e. mapping buffers for DMA capable transfers. Remove all related pices of code. Note, that code, besides its redundancy, was buggy: DMA address potentially can be 0, SPI slave device has nothing to do with DMA capable device properties and DMA mask in particular. Suggested-by: Noralf Trønnes <noralf@tronnes.org> Acked-by: Noralf Trønnes <noralf@tronnes.org> Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers')
-rw-r--r--drivers/staging/fbtft/fb_ra8875.c4
-rw-r--r--drivers/staging/fbtft/fbtft-core.c22
-rw-r--r--drivers/staging/fbtft/fbtft-io.c4
-rw-r--r--drivers/staging/fbtft/fbtft.h1
4 files changed, 2 insertions, 29 deletions
diff --git a/drivers/staging/fbtft/fb_ra8875.c b/drivers/staging/fbtft/fb_ra8875.c
index 308a244972aa..a6bc1503a50e 100644
--- a/drivers/staging/fbtft/fb_ra8875.c
+++ b/drivers/staging/fbtft/fb_ra8875.c
@@ -42,10 +42,6 @@ static int write_spi(struct fbtft_par *par, void *buf, size_t len)
}
spi_message_init(&m);
- if (par->txbuf.dma && buf == par->txbuf.buf) {
- t.tx_dma = par->txbuf.dma;
- m.is_dma_mapped = 1;
- }
spi_message_add_tail(&t, &m);
return spi_sync(par->spi, &m);
}
diff --git a/drivers/staging/fbtft/fbtft-core.c b/drivers/staging/fbtft/fbtft-core.c
index 300a1e4505b9..4e13090c7fbd 100644
--- a/drivers/staging/fbtft/fbtft-core.c
+++ b/drivers/staging/fbtft/fbtft-core.c
@@ -32,7 +32,6 @@
#include <linux/backlight.h>
#include <linux/platform_device.h>
#include <linux/spinlock.h>
-#include <linux/dma-mapping.h>
#include <linux/of.h>
#include <linux/of_gpio.h>
#include <video/mipi_display.h>
@@ -44,12 +43,6 @@ static unsigned long debug;
module_param(debug, ulong, 0);
MODULE_PARM_DESC(debug, "override device debug level");
-#ifdef CONFIG_HAS_DMA
-static bool dma = true;
-module_param(dma, bool, 0);
-MODULE_PARM_DESC(dma, "Use DMA buffer");
-#endif
-
void fbtft_dbg_hex(const struct device *dev, int groupsize,
void *buf, size_t len, const char *fmt, ...)
{
@@ -836,17 +829,7 @@ struct fb_info *fbtft_framebuffer_alloc(struct fbtft_display *display,
#endif
if (txbuflen > 0) {
-#ifdef CONFIG_HAS_DMA
- if (dma) {
- dev->coherent_dma_mask = ~0;
- txbuf = dmam_alloc_coherent(dev, txbuflen,
- &par->txbuf.dma, GFP_DMA);
- } else
-#endif
- {
- txbuf = devm_kzalloc(par->info->device,
- txbuflen, GFP_KERNEL);
- }
+ txbuf = devm_kzalloc(par->info->device, txbuflen, GFP_KERNEL);
if (!txbuf)
goto alloc_fail;
par->txbuf.buf = txbuf;
@@ -975,8 +958,7 @@ int fbtft_register_framebuffer(struct fb_info *fb_info)
fbtft_sysfs_init(par);
if (par->txbuf.buf)
- sprintf(text1, ", %zu KiB %sbuffer memory",
- par->txbuf.len >> 10, par->txbuf.dma ? "DMA " : "");
+ sprintf(text1, ", %zu KiB buffer memory", par->txbuf.len >> 10);
if (spi)
sprintf(text2, ", spi%d.%d at %d MHz", spi->master->bus_num,
spi->chip_select, spi->max_speed_hz / 1000000);
diff --git a/drivers/staging/fbtft/fbtft-io.c b/drivers/staging/fbtft/fbtft-io.c
index 4dcea2e0b3ae..d86840548b74 100644
--- a/drivers/staging/fbtft/fbtft-io.c
+++ b/drivers/staging/fbtft/fbtft-io.c
@@ -22,10 +22,6 @@ int fbtft_write_spi(struct fbtft_par *par, void *buf, size_t len)
}
spi_message_init(&m);
- if (par->txbuf.dma && buf == par->txbuf.buf) {
- t.tx_dma = par->txbuf.dma;
- m.is_dma_mapped = 1;
- }
spi_message_add_tail(&t, &m);
return spi_sync(par->spi, &m);
}
diff --git a/drivers/staging/fbtft/fbtft.h b/drivers/staging/fbtft/fbtft.h
index aacdde92cc2e..b09804773ff2 100644
--- a/drivers/staging/fbtft/fbtft.h
+++ b/drivers/staging/fbtft/fbtft.h
@@ -209,7 +209,6 @@ struct fbtft_par {
u32 pseudo_palette[16];
struct {
void *buf;
- dma_addr_t dma;
size_t len;
} txbuf;
u8 *buf;