summaryrefslogtreecommitdiff
path: root/drivers/gpu/drm/solomon/ssd130x.c
diff options
context:
space:
mode:
Diffstat (limited to 'drivers/gpu/drm/solomon/ssd130x.c')
-rw-r--r--drivers/gpu/drm/solomon/ssd130x.c154
1 files changed, 126 insertions, 28 deletions
diff --git a/drivers/gpu/drm/solomon/ssd130x.c b/drivers/gpu/drm/solomon/ssd130x.c
index ce4dc20412e06..08394444dd6e3 100644
--- a/drivers/gpu/drm/solomon/ssd130x.c
+++ b/drivers/gpu/drm/solomon/ssd130x.c
@@ -39,16 +39,15 @@
#define DRIVER_MAJOR 1
#define DRIVER_MINOR 0
-#define SSD130X_DATA 0x40
-#define SSD130X_COMMAND 0x80
-
+#define SSD130X_PAGE_COL_START_LOW 0x00
+#define SSD130X_PAGE_COL_START_HIGH 0x10
#define SSD130X_SET_ADDRESS_MODE 0x20
#define SSD130X_SET_COL_RANGE 0x21
#define SSD130X_SET_PAGE_RANGE 0x22
#define SSD130X_CONTRAST 0x81
#define SSD130X_SET_LOOKUP_TABLE 0x91
#define SSD130X_CHARGE_PUMP 0x8d
-#define SSD130X_SEG_REMAP_ON 0xa1
+#define SSD130X_SET_SEG_REMAP 0xa0
#define SSD130X_DISPLAY_OFF 0xae
#define SSD130X_SET_MULTIPLEX_RATIO 0xa8
#define SSD130X_DISPLAY_ON 0xaf
@@ -61,7 +60,14 @@
#define SSD130X_SET_COM_PINS_CONFIG 0xda
#define SSD130X_SET_VCOMH 0xdb
-#define SSD130X_SET_COM_SCAN_DIR_MASK GENMASK(3, 2)
+#define SSD130X_PAGE_COL_START_MASK GENMASK(3, 0)
+#define SSD130X_PAGE_COL_START_HIGH_SET(val) FIELD_PREP(SSD130X_PAGE_COL_START_MASK, (val) >> 4)
+#define SSD130X_PAGE_COL_START_LOW_SET(val) FIELD_PREP(SSD130X_PAGE_COL_START_MASK, (val))
+#define SSD130X_START_PAGE_ADDRESS_MASK GENMASK(2, 0)
+#define SSD130X_START_PAGE_ADDRESS_SET(val) FIELD_PREP(SSD130X_START_PAGE_ADDRESS_MASK, (val))
+#define SSD130X_SET_SEG_REMAP_MASK GENMASK(0, 0)
+#define SSD130X_SET_SEG_REMAP_SET(val) FIELD_PREP(SSD130X_SET_SEG_REMAP_MASK, (val))
+#define SSD130X_SET_COM_SCAN_DIR_MASK GENMASK(3, 3)
#define SSD130X_SET_COM_SCAN_DIR_SET(val) FIELD_PREP(SSD130X_SET_COM_SCAN_DIR_MASK, (val))
#define SSD130X_SET_CLOCK_DIV_MASK GENMASK(3, 0)
#define SSD130X_SET_CLOCK_DIV_SET(val) FIELD_PREP(SSD130X_SET_CLOCK_DIV_MASK, (val))
@@ -85,6 +91,38 @@
#define MAX_CONTRAST 255
+const struct ssd130x_deviceinfo ssd130x_variants[] = {
+ [SH1106_ID] = {
+ .default_vcomh = 0x40,
+ .default_dclk_div = 1,
+ .default_dclk_frq = 5,
+ .page_mode_only = 1,
+ },
+ [SSD1305_ID] = {
+ .default_vcomh = 0x34,
+ .default_dclk_div = 1,
+ .default_dclk_frq = 7,
+ },
+ [SSD1306_ID] = {
+ .default_vcomh = 0x20,
+ .default_dclk_div = 1,
+ .default_dclk_frq = 8,
+ .need_chargepump = 1,
+ },
+ [SSD1307_ID] = {
+ .default_vcomh = 0x20,
+ .default_dclk_div = 2,
+ .default_dclk_frq = 12,
+ .need_pwm = 1,
+ },
+ [SSD1309_ID] = {
+ .default_vcomh = 0x34,
+ .default_dclk_div = 1,
+ .default_dclk_frq = 10,
+ }
+};
+EXPORT_SYMBOL_NS_GPL(ssd130x_variants, DRM_SSD130X);
+
static inline struct ssd130x_device *drm_to_ssd130x(struct drm_device *drm)
{
return container_of(drm, struct ssd130x_device, drm);
@@ -128,6 +166,7 @@ out_end:
return ret;
}
+/* Set address range for horizontal/vertical addressing modes */
static int ssd130x_set_col_range(struct ssd130x_device *ssd130x,
u8 col_start, u8 cols)
{
@@ -164,6 +203,26 @@ static int ssd130x_set_page_range(struct ssd130x_device *ssd130x,
return 0;
}
+/* Set page and column start address for page addressing mode */
+static int ssd130x_set_page_pos(struct ssd130x_device *ssd130x,
+ u8 page_start, u8 col_start)
+{
+ int ret;
+ u32 page, col_low, col_high;
+
+ page = SSD130X_START_PAGE_ADDRESS |
+ SSD130X_START_PAGE_ADDRESS_SET(page_start);
+ col_low = SSD130X_PAGE_COL_START_LOW |
+ SSD130X_PAGE_COL_START_LOW_SET(col_start);
+ col_high = SSD130X_PAGE_COL_START_HIGH |
+ SSD130X_PAGE_COL_START_HIGH_SET(col_start);
+ ret = ssd130x_write_cmd(ssd130x, 3, page, col_low, col_high);
+ if (ret < 0)
+ return ret;
+
+ return 0;
+}
+
static int ssd130x_pwm_enable(struct ssd130x_device *ssd130x)
{
struct device *dev = ssd130x->dev;
@@ -235,7 +294,7 @@ static void ssd130x_power_off(struct ssd130x_device *ssd130x)
static int ssd130x_init(struct ssd130x_device *ssd130x)
{
- u32 precharge, dclk, com_invdir, compins, chargepump;
+ u32 precharge, dclk, com_invdir, compins, chargepump, seg_remap;
int ret;
/* Set initial contrast */
@@ -244,11 +303,11 @@ static int ssd130x_init(struct ssd130x_device *ssd130x)
return ret;
/* Set segment re-map */
- if (ssd130x->seg_remap) {
- ret = ssd130x_write_cmd(ssd130x, 1, SSD130X_SEG_REMAP_ON);
- if (ret < 0)
- return ret;
- }
+ seg_remap = (SSD130X_SET_SEG_REMAP |
+ SSD130X_SET_SEG_REMAP_SET(ssd130x->seg_remap));
+ ret = ssd130x_write_cmd(ssd130x, 1, seg_remap);
+ if (ret < 0)
+ return ret;
/* Set COM direction */
com_invdir = (SSD130X_SET_COM_SCAN_DIR |
@@ -340,6 +399,11 @@ static int ssd130x_init(struct ssd130x_device *ssd130x)
}
}
+ /* Switch to page addressing mode */
+ if (ssd130x->page_address_mode)
+ return ssd130x_write_cmd(ssd130x, 2, SSD130X_SET_ADDRESS_MODE,
+ SSD130X_SET_ADDRESS_MODE_PAGE);
+
/* Switch to horizontal addressing mode */
return ssd130x_write_cmd(ssd130x, 2, SSD130X_SET_ADDRESS_MODE,
SSD130X_SET_ADDRESS_MODE_HORIZONTAL);
@@ -353,11 +417,14 @@ static int ssd130x_update_rect(struct ssd130x_device *ssd130x, u8 *buf,
unsigned int width = drm_rect_width(rect);
unsigned int height = drm_rect_height(rect);
unsigned int line_length = DIV_ROUND_UP(width, 8);
- unsigned int pages = DIV_ROUND_UP(y % 8 + height, 8);
+ unsigned int pages = DIV_ROUND_UP(height, 8);
+ struct drm_device *drm = &ssd130x->drm;
u32 array_idx = 0;
int ret, i, j, k;
u8 *data_array = NULL;
+ drm_WARN_ONCE(drm, y % 8 != 0, "y must be aligned to screen page\n");
+
data_array = kcalloc(width, pages, GFP_KERNEL);
if (!data_array)
return -ENOMEM;
@@ -391,21 +458,24 @@ static int ssd130x_update_rect(struct ssd130x_device *ssd130x, u8 *buf,
* (5) A4 B4 C4 D4 E4 F4 G4 H4
*/
- ret = ssd130x_set_col_range(ssd130x, ssd130x->col_offset + x, width);
- if (ret < 0)
- goto out_free;
+ if (!ssd130x->page_address_mode) {
+ /* Set address range for horizontal addressing mode */
+ ret = ssd130x_set_col_range(ssd130x, ssd130x->col_offset + x, width);
+ if (ret < 0)
+ goto out_free;
- ret = ssd130x_set_page_range(ssd130x, ssd130x->page_offset + y / 8, pages);
- if (ret < 0)
- goto out_free;
+ ret = ssd130x_set_page_range(ssd130x, ssd130x->page_offset + y / 8, pages);
+ if (ret < 0)
+ goto out_free;
+ }
- for (i = y / 8; i < y / 8 + pages; i++) {
+ for (i = 0; i < pages; i++) {
int m = 8;
/* Last page may be partial */
- if (8 * (i + 1) > ssd130x->height)
+ if (8 * (y / 8 + i + 1) > ssd130x->height)
m = ssd130x->height % 8;
- for (j = x; j < x + width; j++) {
+ for (j = 0; j < width; j++) {
u8 data = 0;
for (k = 0; k < m; k++) {
@@ -416,9 +486,29 @@ static int ssd130x_update_rect(struct ssd130x_device *ssd130x, u8 *buf,
}
data_array[array_idx++] = data;
}
+
+ /*
+ * In page addressing mode, the start address needs to be reset,
+ * and each page then needs to be written out separately.
+ */
+ if (ssd130x->page_address_mode) {
+ ret = ssd130x_set_page_pos(ssd130x,
+ ssd130x->page_offset + i,
+ ssd130x->col_offset + x);
+ if (ret < 0)
+ goto out_free;
+
+ ret = ssd130x_write_data(ssd130x, data_array, width);
+ if (ret < 0)
+ goto out_free;
+
+ array_idx = 0;
+ }
}
- ret = ssd130x_write_data(ssd130x, data_array, width * pages);
+ /* Write out update in one go if we aren't using page addressing mode */
+ if (!ssd130x->page_address_mode)
+ ret = ssd130x_write_data(ssd130x, data_array, width * pages);
out_free:
kfree(data_array);
@@ -435,7 +525,8 @@ static void ssd130x_clear_screen(struct ssd130x_device *ssd130x)
.y2 = ssd130x->height,
};
- buf = kcalloc(ssd130x->width, ssd130x->height, GFP_KERNEL);
+ buf = kcalloc(DIV_ROUND_UP(ssd130x->width, 8), ssd130x->height,
+ GFP_KERNEL);
if (!buf)
return;
@@ -449,14 +540,20 @@ static int ssd130x_fb_blit_rect(struct drm_framebuffer *fb, const struct iosys_m
{
struct ssd130x_device *ssd130x = drm_to_ssd130x(fb->dev);
void *vmap = map->vaddr; /* TODO: Use mapping abstraction properly */
+ unsigned int dst_pitch;
int ret = 0;
u8 *buf = NULL;
- buf = kcalloc(fb->width, fb->height, GFP_KERNEL);
+ /* Align y to display page boundaries */
+ rect->y1 = round_down(rect->y1, 8);
+ rect->y2 = min_t(unsigned int, round_up(rect->y2, 8), ssd130x->height);
+
+ dst_pitch = DIV_ROUND_UP(drm_rect_width(rect), 8);
+ buf = kcalloc(dst_pitch, drm_rect_height(rect), GFP_KERNEL);
if (!buf)
return -ENOMEM;
- drm_fb_xrgb8888_to_mono_reversed(buf, 0, vmap, fb, rect);
+ drm_fb_xrgb8888_to_mono(buf, dst_pitch, vmap, fb, rect);
ssd130x_update_rect(ssd130x, buf, rect);
@@ -794,6 +891,9 @@ struct ssd130x_device *ssd130x_probe(struct device *dev, struct regmap *regmap)
ssd130x->regmap = regmap;
ssd130x->device_info = device_get_match_data(dev);
+ if (ssd130x->device_info->page_mode_only)
+ ssd130x->page_address_mode = 1;
+
ssd130x_parse_properties(ssd130x);
ret = ssd130x_get_resources(ssd130x);
@@ -824,11 +924,9 @@ struct ssd130x_device *ssd130x_probe(struct device *dev, struct regmap *regmap)
}
EXPORT_SYMBOL_GPL(ssd130x_probe);
-int ssd130x_remove(struct ssd130x_device *ssd130x)
+void ssd130x_remove(struct ssd130x_device *ssd130x)
{
drm_dev_unplug(&ssd130x->drm);
-
- return 0;
}
EXPORT_SYMBOL_GPL(ssd130x_remove);
generated by cgit v1.2.3 (git 2.39.1) at 2025-08-06 14:15:35 +0000