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video: mxsfb: fix broken videomode selection

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Currently the driver re-implements the code found in of_get_videomode()
except for the fact that the latter honors the 'native-mode' property
to select a spcific video timing from the list of possible timings.
The driver builds up a list of all video timings, but uses only the
last mode from the list anyway. While building the list it incorrectly
OR's the 'pixelclk-active' and 'de-active' flags of all modes into
single flags, possibly leading to a wrong pixelclock or data-enable
polarity setting.

Fix this by using the of_get_videomode() directly with the
OF_USE_NATIVE_MODE flag.

Since all current dts files only have one entry in their
display-timings node, this bug was not apparent and the fix does not
change the driver's behaviour for the current users.

Signed-off-by: Lothar Waßmann <LW@KARO-electronics.de>
Signed-off-by: Tomi Valkeinen <tomi.valkeinen@ti.com>
This commit is contained in:
Lothar Waßmann 2014-01-06 14:17:58 +01:00 committed by Tomi Valkeinen
parent 18dd44d89f
commit 838bdf723b
1 changed files with 50 additions and 70 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

120
drivers/video/mxsfb.c
View File

@ -49,6 +49,7 @@
#include <linux/fb.h>
#include <linux/regulator/consumer.h>
#include <video/of_display_timing.h>
#include <video/of_videomode.h>
#include <video/videomode.h>
#define REG_SET 4
@ -589,7 +590,8 @@ static struct fb_ops mxsfb_ops = {
.fb_imageblit = cfb_imageblit,
};
static int mxsfb_restore_mode(struct mxsfb_info *host)
static int mxsfb_restore_mode(struct mxsfb_info *host,
struct fb_videomode *vmode)
{
struct fb_info *fb_info = &host->fb_info;
unsigned line_count;
@ -597,7 +599,6 @@ static int mxsfb_restore_mode(struct mxsfb_info *host)
unsigned long pa, fbsize;
int bits_per_pixel, ofs;
u32 transfer_count, vdctrl0, vdctrl2, vdctrl3, vdctrl4, ctrl;
struct fb_videomode vmode;
/* Only restore the mode when the controller is running */
ctrl = readl(host->base + LCDC_CTRL);
@ -611,8 +612,8 @@ static int mxsfb_restore_mode(struct mxsfb_info *host)
transfer_count = readl(host->base + host->devdata->transfer_count);
vmode.xres = TRANSFER_COUNT_GET_HCOUNT(transfer_count);
vmode.yres = TRANSFER_COUNT_GET_VCOUNT(transfer_count);
vmode->xres = TRANSFER_COUNT_GET_HCOUNT(transfer_count);
vmode->yres = TRANSFER_COUNT_GET_VCOUNT(transfer_count);
switch (CTRL_GET_WORD_LENGTH(ctrl)) {
case 0:
@ -628,40 +629,39 @@ static int mxsfb_restore_mode(struct mxsfb_info *host)
fb_info->var.bits_per_pixel = bits_per_pixel;
vmode.pixclock = KHZ2PICOS(clk_get_rate(host->clk) / 1000U);
vmode.hsync_len = get_hsync_pulse_width(host, vdctrl2);
vmode.left_margin = GET_HOR_WAIT_CNT(vdctrl3) - vmode.hsync_len;
vmode.right_margin = VDCTRL2_GET_HSYNC_PERIOD(vdctrl2) - vmode.hsync_len -
vmode.left_margin - vmode.xres;
vmode.vsync_len = VDCTRL0_GET_VSYNC_PULSE_WIDTH(vdctrl0);
vmode->pixclock = KHZ2PICOS(clk_get_rate(host->clk) / 1000U);
vmode->hsync_len = get_hsync_pulse_width(host, vdctrl2);
vmode->left_margin = GET_HOR_WAIT_CNT(vdctrl3) - vmode->hsync_len;
vmode->right_margin = VDCTRL2_GET_HSYNC_PERIOD(vdctrl2) -
vmode->hsync_len - vmode->left_margin - vmode->xres;
vmode->vsync_len = VDCTRL0_GET_VSYNC_PULSE_WIDTH(vdctrl0);
period = readl(host->base + LCDC_VDCTRL1);
vmode.upper_margin = GET_VERT_WAIT_CNT(vdctrl3) - vmode.vsync_len;
vmode.lower_margin = period - vmode.vsync_len - vmode.upper_margin - vmode.yres;
vmode->upper_margin = GET_VERT_WAIT_CNT(vdctrl3) - vmode->vsync_len;
vmode->lower_margin = period - vmode->vsync_len -
vmode->upper_margin - vmode->yres;
vmode.vmode = FB_VMODE_NONINTERLACED;
vmode->vmode = FB_VMODE_NONINTERLACED;
vmode.sync = 0;
vmode->sync = 0;
if (vdctrl0 & VDCTRL0_HSYNC_ACT_HIGH)
vmode.sync |= FB_SYNC_HOR_HIGH_ACT;
vmode->sync |= FB_SYNC_HOR_HIGH_ACT;
if (vdctrl0 & VDCTRL0_VSYNC_ACT_HIGH)
vmode.sync |= FB_SYNC_VERT_HIGH_ACT;
vmode->sync |= FB_SYNC_VERT_HIGH_ACT;
pr_debug("Reconstructed video mode:\n");
pr_debug("%dx%d, hsync: %u left: %u, right: %u, vsync: %u, upper: %u, lower: %u\n",
vmode.xres, vmode.yres,
vmode.hsync_len, vmode.left_margin, vmode.right_margin,
vmode.vsync_len, vmode.upper_margin, vmode.lower_margin);
pr_debug("pixclk: %ldkHz\n", PICOS2KHZ(vmode.pixclock));
fb_add_videomode(&vmode, &fb_info->modelist);
vmode->xres, vmode->yres, vmode->hsync_len, vmode->left_margin,
vmode->right_margin, vmode->vsync_len, vmode->upper_margin,
vmode->lower_margin);
pr_debug("pixclk: %ldkHz\n", PICOS2KHZ(vmode->pixclock));
host->ld_intf_width = CTRL_GET_BUS_WIDTH(ctrl);
host->dotclk_delay = VDCTRL4_GET_DOTCLK_DLY(vdctrl4);
fb_info->fix.line_length = vmode.xres * (bits_per_pixel >> 3);
fb_info->fix.line_length = vmode->xres * (bits_per_pixel >> 3);
pa = readl(host->base + host->devdata->cur_buf);
fbsize = fb_info->fix.line_length * vmode.yres;
fbsize = fb_info->fix.line_length * vmode->yres;
if (pa < fb_info->fix.smem_start)
return -EINVAL;
if (pa + fbsize > fb_info->fix.smem_start + fb_info->fix.smem_len)
@ -681,18 +681,17 @@ static int mxsfb_restore_mode(struct mxsfb_info *host)
return 0;
}
static int mxsfb_init_fbinfo_dt(struct mxsfb_info *host)
static int mxsfb_init_fbinfo_dt(struct mxsfb_info *host,
struct fb_videomode *vmode)
{
struct fb_info *fb_info = &host->fb_info;
struct fb_var_screeninfo *var = &fb_info->var;
struct device *dev = &host->pdev->dev;
struct device_node *np = host->pdev->dev.of_node;
struct device_node *display_np;
struct device_node *timings_np;
struct display_timings *timings;
struct videomode vm;
u32 width;
int i;
int ret = 0;
int ret;
display_np = of_parse_phandle(np, "display", 0);
if (!display_np) {
@ -732,54 +731,35 @@ static int mxsfb_init_fbinfo_dt(struct mxsfb_info *host)
goto put_display_node;
}
timings = of_get_display_timings(display_np);
if (!timings) {
dev_err(dev, "failed to get display timings\n");
ret = -ENOENT;
ret = of_get_videomode(display_np, &vm, OF_USE_NATIVE_MODE);
if (ret) {
dev_err(dev, "failed to get videomode from DT\n");
goto put_display_node;
}
timings_np = of_find_node_by_name(display_np,
"display-timings");
if (!timings_np) {
dev_err(dev, "failed to find display-timings node\n");
ret = -ENOENT;
ret = fb_videomode_from_videomode(&vm, vmode);
if (ret < 0)
goto put_display_node;
}
for (i = 0; i < of_get_child_count(timings_np); i++) {
struct videomode vm;
struct fb_videomode fb_vm;
if (vm.flags & DISPLAY_FLAGS_DE_HIGH)
host->sync |= MXSFB_SYNC_DATA_ENABLE_HIGH_ACT;
if (vm.flags & DISPLAY_FLAGS_PIXDATA_NEGEDGE)
host->sync |= MXSFB_SYNC_DOTCLK_FALLING_ACT;
ret = videomode_from_timings(timings, &vm, i);
if (ret < 0)
goto put_timings_node;
ret = fb_videomode_from_videomode(&vm, &fb_vm);
if (ret < 0)
goto put_timings_node;
if (vm.flags & DISPLAY_FLAGS_DE_HIGH)
host->sync |= MXSFB_SYNC_DATA_ENABLE_HIGH_ACT;
if (vm.flags & DISPLAY_FLAGS_PIXDATA_NEGEDGE)
host->sync |= MXSFB_SYNC_DOTCLK_FALLING_ACT;
fb_add_videomode(&fb_vm, &fb_info->modelist);
}
put_timings_node:
of_node_put(timings_np);
put_display_node:
of_node_put(display_np);
return ret;
}
static int mxsfb_init_fbinfo(struct mxsfb_info *host)
static int mxsfb_init_fbinfo(struct mxsfb_info *host,
struct fb_videomode *vmode)
{
int ret;
struct fb_info *fb_info = &host->fb_info;
struct fb_var_screeninfo *var = &fb_info->var;
dma_addr_t fb_phys;
void *fb_virt;
unsigned fb_size;
int ret;
fb_info->fbops = &mxsfb_ops;
fb_info->flags = FBINFO_FLAG_DEFAULT | FBINFO_READS_FAST;
@ -789,7 +769,7 @@ static int mxsfb_init_fbinfo(struct mxsfb_info *host)
fb_info->fix.visual = FB_VISUAL_TRUECOLOR,
fb_info->fix.accel = FB_ACCEL_NONE;
ret = mxsfb_init_fbinfo_dt(host);
ret = mxsfb_init_fbinfo_dt(host, vmode);
if (ret)
return ret;
@ -810,7 +790,7 @@ static int mxsfb_init_fbinfo(struct mxsfb_info *host)
fb_info->screen_base = fb_virt;
fb_info->screen_size = fb_info->fix.smem_len = fb_size;
if (mxsfb_restore_mode(host))
if (mxsfb_restore_mode(host, vmode))
memset(fb_virt, 0, fb_size);
return 0;
@ -850,7 +830,7 @@ static int mxsfb_probe(struct platform_device *pdev)
struct resource *res;
struct mxsfb_info *host;
struct fb_info *fb_info;
struct fb_modelist *modelist;
struct fb_videomode *mode;
int ret;
if (of_id)
@ -862,6 +842,11 @@ static int mxsfb_probe(struct platform_device *pdev)
return -ENOMEM;
}
mode = devm_kzalloc(&pdev->dev, sizeof(struct fb_videomode),
GFP_KERNEL);
if (mode == NULL)
return -ENOMEM;
host = to_imxfb_host(fb_info);
res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
@ -893,15 +878,11 @@ static int mxsfb_probe(struct platform_device *pdev)
goto fb_release;
}
INIT_LIST_HEAD(&fb_info->modelist);
ret = mxsfb_init_fbinfo(host);
ret = mxsfb_init_fbinfo(host, mode);
if (ret != 0)
goto fb_release;
modelist = list_first_entry(&fb_info->modelist,
struct fb_modelist, list);
fb_videomode_to_var(&fb_info->var, &modelist->mode);
fb_videomode_to_var(&fb_info->var, mode);
/* init the color fields */
mxsfb_check_var(&fb_info->var, fb_info);
@ -927,7 +908,6 @@ static int mxsfb_probe(struct platform_device *pdev)
fb_destroy:
if (host->enabled)
clk_disable_unprepare(host->clk);
fb_destroy_modelist(&fb_info->modelist);
fb_release:
framebuffer_release(fb_info);