summaryrefslogtreecommitdiff
path: root/drivers
diff options
context:
space:
mode:
authorLinus Walleij <linus.walleij@linaro.org>2016-06-16 12:36:16 +0300
committerTomi Valkeinen <tomi.valkeinen@ti.com>2016-08-11 17:54:53 +0300
commit046ad6cdeb3f83abcbfa2af88ce471afb2e7fc30 (patch)
tree6b668c3b7b7540c22105bc5fc22d0ef5e13af9fb /drivers
parent03d14c36af98dd2191c2e35b5ed55ff93b59d345 (diff)
downloadlinux-046ad6cdeb3f83abcbfa2af88ce471afb2e7fc30.tar.xz
video: ARM CLCD: support Nomadik variant
The Nomadik variant has a few special quirks that need to be respected to make the driver work: - The block need to be clocked during writing of the TIMn registers or the bus will stall. - Special bits in the control register select how many of the output display lines get activated. - Special bits in the control register select how to manage the different 565 and 5551 modes. - There is a packed 24bit graphics mode, i.e 888 pixels can be stored in memory is three consecutive bytes, not evenly aligned to a 32bit word. This patch uses the vendor data pointer from the AMBA matching mechanism to track the quirks for this variant, and adds two hooks that variants can use to initialize boards and panels during start-up. These will later be used to adopt a Nomadik board profile. Cc: Pawel Moll <pawel.moll@arm.com> Cc: Rob Herring <robh@kernel.org> Cc: Russell King <linux@arm.linux.org.uk> Signed-off-by: Linus Walleij <linus.walleij@linaro.org> Signed-off-by: Tomi Valkeinen <tomi.valkeinen@ti.com>
Diffstat (limited to 'drivers')
-rw-r--r--drivers/video/fbdev/amba-clcd.c106
1 files changed, 97 insertions, 9 deletions
diff --git a/drivers/video/fbdev/amba-clcd.c b/drivers/video/fbdev/amba-clcd.c
index 080e8a246faf..371f4e2aea6c 100644
--- a/drivers/video/fbdev/amba-clcd.c
+++ b/drivers/video/fbdev/amba-clcd.c
@@ -225,6 +225,15 @@ 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;
@@ -311,6 +320,12 @@ 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);
@@ -710,6 +725,42 @@ static int clcdfb_of_init_tft_panel(struct clcd_fb *fb, u32 r0, u32 g0, u32 b0)
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;
}
@@ -725,9 +776,21 @@ static int clcdfb_of_init_display(struct clcd_fb *fb)
if (!fb->panel)
return -ENOMEM;
- endpoint = of_graph_get_next_endpoint(fb->dev->dev.of_node, NULL);
- if (!endpoint)
- return -ENODEV;
+ /*
+ * Fetch the panel endpoint.
+ */
+ if (!endpoint) {
+ endpoint = of_graph_get_next_endpoint(fb->dev->dev.of_node,
+ NULL);
+ if (!endpoint)
+ return -ENODEV;
+ }
+
+ 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)
@@ -764,11 +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)
@@ -889,6 +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;
@@ -898,6 +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;
@@ -916,10 +986,11 @@ 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);
@@ -962,10 +1033,27 @@ static int clcdfb_remove(struct amba_device *dev)
return 0;
}
+static struct clcd_vendor_data vendor_arm = {
+ /* No special business */
+};
+
+static struct clcd_vendor_data vendor_nomadik = {
+ .clock_timregs = true,
+ .packed_24_bit_pixels = true,
+ .st_bitmux_control = true,
+};
+
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 },
};