fbdev: i.MX31: fix panning, error handling, clean up

1. check for errors returned from clk_get()
2. fix "Unbalanced enable for IRQ 160"
3. fix transmit descriptor handling in panning
4. clean frame buffer on blank - useful for OLED displays
5. formatting clean up

Signed-off-by: Guennadi Liakhovetski <lg@denx.de>
Cc: Dan Williams <dan.j.williams@intel.com>
Cc: Sascha Hauer <s.hauer@pengutronix.de>
Cc: Krzysztof Helt <krzysztof.h1@poczta.fm>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

diff --git a/drivers/video/mx3fb.c b/drivers/video/mx3fb.c
index fa1a512..21b3692 100644 (file)
--- a/drivers/video/mx3fb.c
+++ b/drivers/video/mx3fb.c
@@ -400,12 +400,12 @@ static void sdc_disable_channel(struct mx3fb_info *mx3_fbi)
 static int sdc_set_window_pos(struct mx3fb_data *mx3fb, enum ipu_channel channel,
                              int16_t x_pos, int16_t y_pos)
 {
-       x_pos += mx3fb->h_start_width;
-       y_pos += mx3fb->v_start_width;
-
        if (channel != IDMAC_SDC_0)
                return -EINVAL;
 
+       x_pos += mx3fb->h_start_width;
+       y_pos += mx3fb->v_start_width;
+
        mx3fb_write_reg(mx3fb, (x_pos << 16) | y_pos, SDC_BG_POS);
        return 0;
 }
@@ -491,11 +491,13 @@ static int sdc_init_panel(struct mx3fb_data *mx3fb, enum ipu_panel panel,
         * 2^4 to get fractional part, as long as we stay under ~250MHz and on
         * i.MX31 it (HSP_CLK) is <= 178MHz. Currently 128.267MHz
         */
-       dev_dbg(mx3fb->dev, "pixel clk = %d\n", pixel_clk);
-
        ipu_clk = clk_get(mx3fb->dev, NULL);
-       div = clk_get_rate(ipu_clk) * 16 / pixel_clk;
-       clk_put(ipu_clk);
+       if (!IS_ERR(ipu_clk)) {
+               div = clk_get_rate(ipu_clk) * 16 / pixel_clk;
+               clk_put(ipu_clk);
+       } else {
+               div = 0;
+       }
 
        if (div < 0x40) {       /* Divider less than 4 */
                dev_dbg(mx3fb->dev,
@@ -503,6 +505,9 @@ static int sdc_init_panel(struct mx3fb_data *mx3fb, enum ipu_panel panel,
                div = 0x40;
        }
 
+       dev_dbg(mx3fb->dev, "pixel clk = %u, divider %u.%u\n",
+               pixel_clk, div >> 4, (div & 7) * 125);
+
        spin_lock_irqsave(&mx3fb->lock, lock_flags);
 
        /*
@@ -515,16 +520,16 @@ static int sdc_init_panel(struct mx3fb_data *mx3fb, enum ipu_panel panel,
        /* DI settings */
        old_conf = mx3fb_read_reg(mx3fb, DI_DISP_IF_CONF) & 0x78FFFFFF;
        old_conf |= sig.datamask_en << DI_D3_DATAMSK_SHIFT |
-           sig.clksel_en << DI_D3_CLK_SEL_SHIFT |
-           sig.clkidle_en << DI_D3_CLK_IDLE_SHIFT;
+               sig.clksel_en << DI_D3_CLK_SEL_SHIFT |
+               sig.clkidle_en << DI_D3_CLK_IDLE_SHIFT;
        mx3fb_write_reg(mx3fb, old_conf, DI_DISP_IF_CONF);
 
        old_conf = mx3fb_read_reg(mx3fb, DI_DISP_SIG_POL) & 0xE0FFFFFF;
        old_conf |= sig.data_pol << DI_D3_DATA_POL_SHIFT |
-           sig.clk_pol << DI_D3_CLK_POL_SHIFT |
-           sig.enable_pol << DI_D3_DRDY_SHARP_POL_SHIFT |
-           sig.Hsync_pol << DI_D3_HSYNC_POL_SHIFT |
-           sig.Vsync_pol << DI_D3_VSYNC_POL_SHIFT;
+               sig.clk_pol << DI_D3_CLK_POL_SHIFT |
+               sig.enable_pol << DI_D3_DRDY_SHARP_POL_SHIFT |
+               sig.Hsync_pol << DI_D3_HSYNC_POL_SHIFT |
+               sig.Vsync_pol << DI_D3_VSYNC_POL_SHIFT;
        mx3fb_write_reg(mx3fb, old_conf, DI_DISP_SIG_POL);
 
        switch (pixel_fmt) {
@@ -721,7 +726,6 @@ static int mx3fb_set_par(struct fb_info *fbi)
        struct idmac_channel *ichan = mx3_fbi->idmac_channel;
        struct idmac_video_param *video = &ichan->params.video;
        struct scatterlist *sg = mx3_fbi->sg;
-       size_t screen_size;
 
        dev_dbg(mx3fb->dev, "%s [%c]\n", __func__, list_empty(&ichan->queue) ? '-' : '+');
 
@@ -745,12 +749,10 @@ static int mx3fb_set_par(struct fb_info *fbi)
                }
        }
 
-       screen_size = fbi->fix.line_length * fbi->var.yres;
-
        sg_init_table(&sg[0], 1);
        sg_init_table(&sg[1], 1);
 
-       sg_dma_address(&sg[0])  = fbi->fix.smem_start;
+       sg_dma_address(&sg[0]) = fbi->fix.smem_start;
        sg_set_page(&sg[0], virt_to_page(fbi->screen_base),
                    fbi->fix.smem_len,
                    offset_in_page(fbi->screen_base));
@@ -927,7 +929,7 @@ static int mx3fb_setcolreg(unsigned int regno, unsigned int red,
        u32 val;
        int ret = 1;
 
-       dev_dbg(fbi->device, "%s\n", __func__);
+       dev_dbg(fbi->device, "%s, regno = %u\n", __func__, regno);
 
        mutex_lock(&mx3_fbi->mutex);
        /*
@@ -973,9 +975,8 @@ static int mx3fb_blank(int blank, struct fb_info *fbi)
        struct mx3fb_info *mx3_fbi = fbi->par;
        struct mx3fb_data *mx3fb = mx3_fbi->mx3fb;
 
-       dev_dbg(fbi->device, "%s\n", __func__);
-
-       dev_dbg(fbi->device, "blank = %d\n", blank);
+       dev_dbg(fbi->device, "%s, blank = %d, base %p, len %u\n", __func__,
+               blank, fbi->screen_base, fbi->fix.smem_len);
 
        if (mx3_fbi->blank == blank)
                return 0;
@@ -988,8 +989,11 @@ static int mx3fb_blank(int blank, struct fb_info *fbi)
        case FB_BLANK_VSYNC_SUSPEND:
        case FB_BLANK_HSYNC_SUSPEND:
        case FB_BLANK_NORMAL:
-               sdc_disable_channel(mx3_fbi);
                sdc_set_brightness(mx3fb, 0);
+               memset((char *)fbi->screen_base, 0, fbi->fix.smem_len);
+               /* Give LCD time to update - enough for 50 and 60 Hz */
+               msleep(25);
+               sdc_disable_channel(mx3_fbi);
                break;
        case FB_BLANK_UNBLANK:
                sdc_enable_channel(mx3_fbi);
@@ -1063,6 +1067,7 @@ static int mx3fb_pan_display(struct fb_var_screeninfo *var,
                mutex_unlock(&mx3_fbi->mutex);
                dev_info(fbi->device, "Panning failed due to %s\n", ret < 0 ?
                         "user interrupt" : "timeout");
+               disable_irq(mx3_fbi->idmac_channel->eof_irq);
                return ret ? : -ETIMEDOUT;
        }
 
@@ -1073,6 +1078,9 @@ static int mx3fb_pan_display(struct fb_var_screeninfo *var,
                    virt_to_page(fbi->screen_base + offset), fbi->fix.smem_len,
                    offset_in_page(fbi->screen_base + offset));
 
+       if (mx3_fbi->txd)
+               async_tx_ack(mx3_fbi->txd);
+
        txd = dma_chan->device->device_prep_slave_sg(dma_chan, sg +
                mx3_fbi->cur_ipu_buf, 1, DMA_TO_DEVICE, DMA_PREP_INTERRUPT);
        if (!txd) {
@@ -1099,8 +1107,6 @@ static int mx3fb_pan_display(struct fb_var_screeninfo *var,
                return -EIO;
        }
 
-       if (mx3_fbi->txd)
-               async_tx_ack(mx3_fbi->txd);
        mx3_fbi->txd = txd;
 
        fbi->var.xoffset = var->xoffset;
@@ -1506,7 +1512,7 @@ static struct platform_driver mx3fb_driver = {
  * example:
  *     video=mx3fb:bpp=16
  */
-static int mx3fb_setup(void)
+static int __init mx3fb_setup(void)
 {
 #ifndef MODULE
        char *opt, *options = NULL;