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path: root/drivers/video/fbdev/amba-clcd.c
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Diffstat (limited to 'drivers/video/fbdev/amba-clcd.c')
-rw-r--r--drivers/video/fbdev/amba-clcd.c190
1 files changed, 176 insertions, 14 deletions
diff --git a/drivers/video/fbdev/amba-clcd.c b/drivers/video/fbdev/amba-clcd.c
index 9b158869cb89..ec2671d98abc 100644
--- a/drivers/video/fbdev/amba-clcd.c
+++ b/drivers/video/fbdev/amba-clcd.c
@@ -30,10 +30,14 @@
#include <linux/of.h>
#include <linux/of_address.h>
#include <linux/of_graph.h>
+#include <linux/backlight.h>
#include <video/display_timing.h>
#include <video/of_display_timing.h>
#include <video/videomode.h>
+#include "amba-clcd-nomadik.h"
+#include "amba-clcd-versatile.h"
+
#define to_clcd(info) container_of(info, struct clcd_fb, fb)
/* This is limited to 16 characters when displayed by X startup */
@@ -71,6 +75,11 @@ static void clcdfb_disable(struct clcd_fb *fb)
if (fb->board->disable)
fb->board->disable(fb);
+ if (fb->panel->backlight) {
+ fb->panel->backlight->props.power = FB_BLANK_POWERDOWN;
+ backlight_update_status(fb->panel->backlight);
+ }
+
val = readl(fb->regs + fb->off_cntl);
if (val & CNTL_LCDPWR) {
val &= ~CNTL_LCDPWR;
@@ -117,6 +126,14 @@ static void clcdfb_enable(struct clcd_fb *fb, u32 cntl)
writel(cntl, fb->regs + fb->off_cntl);
/*
+ * Turn on backlight
+ */
+ if (fb->panel->backlight) {
+ fb->panel->backlight->props.power = FB_BLANK_UNBLANK;
+ backlight_update_status(fb->panel->backlight);
+ }
+
+ /*
* finally, enable the interface.
*/
if (fb->board->enable)
@@ -211,6 +228,15 @@ clcdfb_set_bitfields(struct clcd_fb *fb, struct fb_var_screeninfo *var)
var->blue.length = 4;
}
break;
+ case 24:
+ if (fb->vendor->packed_24_bit_pixels) {
+ var->red.length = 8;
+ var->green.length = 8;
+ var->blue.length = 8;
+ } else {
+ ret = -EINVAL;
+ }
+ break;
case 32:
/* If we can't do 888, reject */
caps &= CLCD_CAP_888;
@@ -297,6 +323,12 @@ static int clcdfb_set_par(struct fb_info *info)
clcdfb_disable(fb);
+ /* Some variants must be clocked here */
+ if (fb->vendor->clock_timregs && !fb->clk_enabled) {
+ fb->clk_enabled = true;
+ clk_enable(fb->clk);
+ }
+
writel(regs.tim0, fb->regs + CLCD_TIM0);
writel(regs.tim1, fb->regs + CLCD_TIM1);
writel(regs.tim2, fb->regs + CLCD_TIM2);
@@ -551,7 +583,7 @@ static int clcdfb_register(struct clcd_fb *fb)
#ifdef CONFIG_OF
static int clcdfb_of_get_dpi_panel_mode(struct device_node *node,
- struct fb_videomode *mode)
+ struct clcd_panel *clcd_panel)
{
int err;
struct display_timing timing;
@@ -563,10 +595,31 @@ static int clcdfb_of_get_dpi_panel_mode(struct device_node *node,
videomode_from_timing(&timing, &video);
- err = fb_videomode_from_videomode(&video, mode);
+ err = fb_videomode_from_videomode(&video, &clcd_panel->mode);
if (err)
return err;
+ /* Set up some inversion flags */
+ if (timing.flags & DISPLAY_FLAGS_PIXDATA_NEGEDGE)
+ clcd_panel->tim2 |= TIM2_IPC;
+ else if (!(timing.flags & DISPLAY_FLAGS_PIXDATA_POSEDGE))
+ /*
+ * To preserve backwards compatibility, the IPC (inverted
+ * pixel clock) flag needs to be set on any display that
+ * doesn't explicitly specify that the pixel clock is
+ * active on the negative or positive edge.
+ */
+ clcd_panel->tim2 |= TIM2_IPC;
+
+ if (timing.flags & DISPLAY_FLAGS_HSYNC_LOW)
+ clcd_panel->tim2 |= TIM2_IHS;
+
+ if (timing.flags & DISPLAY_FLAGS_VSYNC_LOW)
+ clcd_panel->tim2 |= TIM2_IVS;
+
+ if (timing.flags & DISPLAY_FLAGS_DE_LOW)
+ clcd_panel->tim2 |= TIM2_IOE;
+
return 0;
}
@@ -576,11 +629,34 @@ static int clcdfb_snprintf_mode(char *buf, int size, struct fb_videomode *mode)
mode->refresh);
}
+static int clcdfb_of_get_backlight(struct device_node *endpoint,
+ struct clcd_panel *clcd_panel)
+{
+ struct device_node *panel;
+ struct device_node *backlight;
+
+ panel = of_graph_get_remote_port_parent(endpoint);
+ if (!panel)
+ return -ENODEV;
+
+ /* Look up the optional backlight phandle */
+ backlight = of_parse_phandle(panel, "backlight", 0);
+ if (backlight) {
+ clcd_panel->backlight = of_find_backlight_by_node(backlight);
+ of_node_put(backlight);
+
+ if (!clcd_panel->backlight)
+ return -EPROBE_DEFER;
+ }
+ return 0;
+}
+
static int clcdfb_of_get_mode(struct device *dev, struct device_node *endpoint,
- struct fb_videomode *mode)
+ struct clcd_panel *clcd_panel)
{
int err;
struct device_node *panel;
+ struct fb_videomode *mode;
char *name;
int len;
@@ -590,11 +666,12 @@ static int clcdfb_of_get_mode(struct device *dev, struct device_node *endpoint,
/* Only directly connected DPI panels supported for now */
if (of_device_is_compatible(panel, "panel-dpi"))
- err = clcdfb_of_get_dpi_panel_mode(panel, mode);
+ err = clcdfb_of_get_dpi_panel_mode(panel, clcd_panel);
else
err = -ENOENT;
if (err)
return err;
+ mode = &clcd_panel->mode;
len = clcdfb_snprintf_mode(NULL, 0, mode);
name = devm_kzalloc(dev, len + 1, GFP_KERNEL);
@@ -616,6 +693,7 @@ static int clcdfb_of_init_tft_panel(struct clcd_fb *fb, u32 r0, u32 g0, u32 b0)
} panels[] = {
{ 0x110, 1, 7, 13, CLCD_CAP_5551 },
{ 0x110, 0, 8, 16, CLCD_CAP_888 },
+ { 0x110, 16, 8, 0, CLCD_CAP_888 },
{ 0x111, 4, 14, 20, CLCD_CAP_444 },
{ 0x111, 3, 11, 19, CLCD_CAP_444 | CLCD_CAP_5551 },
{ 0x111, 3, 10, 19, CLCD_CAP_444 | CLCD_CAP_5551 |
@@ -625,8 +703,8 @@ static int clcdfb_of_init_tft_panel(struct clcd_fb *fb, u32 r0, u32 g0, u32 b0)
};
int i;
- /* Bypass pixel clock divider, data output on the falling edge */
- fb->panel->tim2 = TIM2_BCD | TIM2_IPC;
+ /* Bypass pixel clock divider */
+ fb->panel->tim2 |= TIM2_BCD;
/* TFT display, vert. comp. interrupt at the start of the back porch */
fb->panel->cntl |= CNTL_LCDTFT | CNTL_LCDVCOMP(1);
@@ -643,6 +721,49 @@ static int clcdfb_of_init_tft_panel(struct clcd_fb *fb, u32 r0, u32 g0, u32 b0)
fb->panel->caps = panels[i].caps;
}
+ /*
+ * If we actually physically connected the R lines to B and
+ * vice versa
+ */
+ if (r0 != 0 && b0 == 0)
+ fb->panel->bgr_connection = true;
+
+ if (fb->panel->caps && fb->vendor->st_bitmux_control) {
+ /*
+ * Set up the special bits for the Nomadik control register
+ * (other platforms tend to do this through an external
+ * register).
+ */
+
+ /* Offset of the highest used color */
+ int maxoff = max3(r0, g0, b0);
+ /* Most significant bit out, highest used bit */
+ int msb = 0;
+
+ if (fb->panel->caps & CLCD_CAP_888) {
+ msb = maxoff + 8 - 1;
+ } else if (fb->panel->caps & CLCD_CAP_565) {
+ msb = maxoff + 5 - 1;
+ fb->panel->cntl |= CNTL_ST_1XBPP_565;
+ } else if (fb->panel->caps & CLCD_CAP_5551) {
+ msb = maxoff + 5 - 1;
+ fb->panel->cntl |= CNTL_ST_1XBPP_5551;
+ } else if (fb->panel->caps & CLCD_CAP_444) {
+ msb = maxoff + 4 - 1;
+ fb->panel->cntl |= CNTL_ST_1XBPP_444;
+ }
+
+ /* Send out as many bits as we need */
+ if (msb > 17)
+ fb->panel->cntl |= CNTL_ST_CDWID_24;
+ else if (msb > 15)
+ fb->panel->cntl |= CNTL_ST_CDWID_18;
+ else if (msb > 11)
+ fb->panel->cntl |= CNTL_ST_CDWID_16;
+ else
+ fb->panel->cntl |= CNTL_ST_CDWID_12;
+ }
+
return fb->panel->caps ? 0 : -EINVAL;
}
@@ -658,11 +779,24 @@ static int clcdfb_of_init_display(struct clcd_fb *fb)
if (!fb->panel)
return -ENOMEM;
+ /*
+ * Fetch the panel endpoint.
+ */
endpoint = of_graph_get_next_endpoint(fb->dev->dev.of_node, NULL);
if (!endpoint)
return -ENODEV;
- err = clcdfb_of_get_mode(&fb->dev->dev, endpoint, &fb->panel->mode);
+ if (fb->vendor->init_panel) {
+ err = fb->vendor->init_panel(fb, endpoint);
+ if (err)
+ return err;
+ }
+
+ err = clcdfb_of_get_backlight(endpoint, fb->panel);
+ if (err)
+ return err;
+
+ err = clcdfb_of_get_mode(&fb->dev->dev, endpoint, fb->panel);
if (err)
return err;
@@ -693,11 +827,11 @@ static int clcdfb_of_init_display(struct clcd_fb *fb)
if (of_property_read_u32_array(endpoint,
"arm,pl11x,tft-r0g0b0-pads",
- tft_r0b0g0, ARRAY_SIZE(tft_r0b0g0)) == 0)
- return clcdfb_of_init_tft_panel(fb, tft_r0b0g0[0],
- tft_r0b0g0[1], tft_r0b0g0[2]);
+ tft_r0b0g0, ARRAY_SIZE(tft_r0b0g0)) != 0)
+ return -ENOENT;
- return -ENOENT;
+ return clcdfb_of_init_tft_panel(fb, tft_r0b0g0[0],
+ tft_r0b0g0[1], tft_r0b0g0[2]);
}
static int clcdfb_of_vram_setup(struct clcd_fb *fb)
@@ -818,6 +952,7 @@ static struct clcd_board *clcdfb_of_get_board(struct amba_device *dev)
static int clcdfb_probe(struct amba_device *dev, const struct amba_id *id)
{
struct clcd_board *board = dev_get_platdata(&dev->dev);
+ struct clcd_vendor_data *vendor = id->data;
struct clcd_fb *fb;
int ret;
@@ -827,6 +962,12 @@ static int clcdfb_probe(struct amba_device *dev, const struct amba_id *id)
if (!board)
return -EINVAL;
+ if (vendor->init_board) {
+ ret = vendor->init_board(dev, board);
+ if (ret)
+ return ret;
+ }
+
ret = dma_set_mask_and_coherent(&dev->dev, DMA_BIT_MASK(32));
if (ret)
goto out;
@@ -845,17 +986,18 @@ static int clcdfb_probe(struct amba_device *dev, const struct amba_id *id)
}
fb->dev = dev;
+ fb->vendor = vendor;
fb->board = board;
- dev_info(&fb->dev->dev, "PL%03x rev%u at 0x%08llx\n",
- amba_part(dev), amba_rev(dev),
+ dev_info(&fb->dev->dev, "PL%03x designer %02x rev%u at 0x%08llx\n",
+ amba_part(dev), amba_manf(dev), amba_rev(dev),
(unsigned long long)dev->res.start);
ret = fb->board->setup(fb);
if (ret)
goto free_fb;
- ret = clcdfb_register(fb);
+ ret = clcdfb_register(fb);
if (ret == 0) {
amba_set_drvdata(dev, fb);
goto out;
@@ -891,10 +1033,30 @@ static int clcdfb_remove(struct amba_device *dev)
return 0;
}
+static struct clcd_vendor_data vendor_arm = {
+ /* Sets up the versatile board displays */
+ .init_panel = versatile_clcd_init_panel,
+};
+
+static struct clcd_vendor_data vendor_nomadik = {
+ .clock_timregs = true,
+ .packed_24_bit_pixels = true,
+ .st_bitmux_control = true,
+ .init_board = nomadik_clcd_init_board,
+ .init_panel = nomadik_clcd_init_panel,
+};
+
static struct amba_id clcdfb_id_table[] = {
{
.id = 0x00041110,
.mask = 0x000ffffe,
+ .data = &vendor_arm,
+ },
+ /* ST Electronics Nomadik variant */
+ {
+ .id = 0x00180110,
+ .mask = 0x00fffffe,
+ .data = &vendor_nomadik,
},
{ 0, 0 },
};
generated by cgit v1.2.3 (git 2.0.4) at 2024-06-12 16:58:31 +0000