video: fbdev: ssd1307fb: Added support to Column offset

This patch provides support for displays like VGM128064B0W10,
which requires a column offset of 2, i.e., its segments starts
in SEG2 and ends in SEG129.

Signed-off-by: Rodrigo Alencar <455.rodrigo.alencar@gmail.com>
Acked-by: Rob Herring <robh@kernel.org>
Signed-off-by: Bartlomiej Zolnierkiewicz <b.zolnierkie@samsung.com>
Link: https://patchwork.freedesktop.org/patch/msgid/1595622138-3965-1-git-send-email-455.rodrigo.alencar@gmail.com

diff --git a/Documentation/devicetree/bindings/display/ssd1307fb.txt b/Documentation/devicetree/bindings/display/ssd1307fb.txt
index 27333b9..2dcb6d1 100644 (file)
--- a/Documentation/devicetree/bindings/display/ssd1307fb.txt
+++ b/Documentation/devicetree/bindings/display/ssd1307fb.txt
@@ -19,6 +19,7 @@ Optional properties:
   - vbat-supply: The supply for VBAT
   - solomon,segment-no-remap: Display needs normal (non-inverted) data column
                               to segment mapping
+  - solomon,col-offset: Offset of columns (COL/SEG) that the screen is mapped to.
   - solomon,com-seq: Display uses sequential COM pin configuration
   - solomon,com-lrremap: Display uses left-right COM pin remap
   - solomon,com-invdir: Display uses inverted COM pin scan direction

diff --git a/drivers/video/fbdev/ssd1307fb.c b/drivers/video/fbdev/ssd1307fb.c
index 09425ec..eda448b 100644 (file)
--- a/drivers/video/fbdev/ssd1307fb.c
+++ b/drivers/video/fbdev/ssd1307fb.c
@@ -74,6 +74,7 @@ struct ssd1307fb_par {
        struct fb_info *info;
        u8 lookup_table[4];
        u32 page_offset;
+       u32 col_offset;
        u32 prechargep1;
        u32 prechargep2;
        struct pwm_device *pwm;
@@ -458,11 +459,11 @@ static int ssd1307fb_init(struct ssd1307fb_par *par)
        if (ret < 0)
                return ret;
 
-       ret = ssd1307fb_write_cmd(par->client, 0x0);
+       ret = ssd1307fb_write_cmd(par->client, par->col_offset);
        if (ret < 0)
                return ret;
 
-       ret = ssd1307fb_write_cmd(par->client, par->width - 1);
+       ret = ssd1307fb_write_cmd(par->client, par->col_offset + par->width - 1);
        if (ret < 0)
                return ret;
 
@@ -626,6 +627,9 @@ static int ssd1307fb_probe(struct i2c_client *client)
        if (device_property_read_u32(dev, "solomon,page-offset", &par->page_offset))
                par->page_offset = 1;
 
+       if (device_property_read_u32(dev, "solomon,col-offset", &par->col_offset))
+               par->col_offset = 0;
+
        if (device_property_read_u32(dev, "solomon,com-offset", &par->com_offset))
                par->com_offset = 0;