The quantity of output for one iteration could be different for dpi and
dp_intf. For dp_intf, it's 4 pixels for one iteration it's 1 pixel for one
iteration for dpi. Therefore, we add a new config "pixels_per_iter" to
control quantity of transferred pixels per iteration.
Signed-off-by: Bo-Chen Chen <rex-bc.chen@xxxxxxxxxxxx>
Reviewed-by: AngeloGioacchino Del Regno <angelogioacchino.delregno@xxxxxxxxxxxxx>
---
drivers/gpu/drm/mediatek/mtk_dpi.c | 26 +++++++++++++++++++++++---
1 file changed, 23 insertions(+), 3 deletions(-)
diff --git a/drivers/gpu/drm/mediatek/mtk_dpi.c b/drivers/gpu/drm/mediatek/mtk_dpi.c
index a1dcb3089c3a..5f71a68c6a0b 100644
--- a/drivers/gpu/drm/mediatek/mtk_dpi.c
+++ b/drivers/gpu/drm/mediatek/mtk_dpi.c
@@ -132,6 +132,7 @@ struct mtk_dpi_yc_limit {
* @channel_swap_shift: Shift value of channel swap.
* @yuv422_en_bit: Enable bit of yuv422.
* @csc_enable_bit: Enable bit of CSC.
+ * @pixels_per_iter: Quantity of transferred pixels per iteration.
*/
struct mtk_dpi_conf {
unsigned int (*cal_factor)(int clock);
@@ -149,6 +150,7 @@ struct mtk_dpi_conf {
u32 channel_swap_shift;
u32 yuv422_en_bit;
u32 csc_enable_bit;
+ u32 pixels_per_iter;
};
static void mtk_dpi_mask(struct mtk_dpi *dpi, u32 offset, u32 val, u32 mask)
@@ -522,7 +524,14 @@ static int mtk_dpi_set_display_mode(struct mtk_dpi *dpi,
clk_set_rate(dpi->tvd_clk, pll_rate);
pll_rate = clk_get_rate(dpi->tvd_clk);
+ /*
+ * Depending on the IP version, we may output a different amount of
+ * pixels for each iteration: divide the clock by this number and
+ * adjust the display porches accordingly.
+ */
vm.pixelclock = pll_rate / factor;
+ vm.pixelclock /= dpi->conf->pixels_per_iter;
+
if ((dpi->output_fmt == MEDIA_BUS_FMT_RGB888_2X12_LE) ||
(dpi->output_fmt == MEDIA_BUS_FMT_RGB888_2X12_BE))
clk_set_rate(dpi->pixel_clk, vm.pixelclock * 2);
@@ -541,9 +550,16 @@ static int mtk_dpi_set_display_mode(struct mtk_dpi *dpi,
MTK_DPI_POLARITY_FALLING : MTK_DPI_POLARITY_RISING;
dpi_pol.vsync_pol = vm.flags & DISPLAY_FLAGS_VSYNC_HIGH ?
MTK_DPI_POLARITY_FALLING : MTK_DPI_POLARITY_RISING;
- hsync.sync_width = vm.hsync_len;
- hsync.back_porch = vm.hback_porch;
- hsync.front_porch = vm.hfront_porch;
+
+ /*
+ * Depending on the IP version, we may output a different amount of
+ * pixels for each iteration: divide the clock by this number and
+ * adjust the display porches accordingly.
+ */
+ hsync.sync_width = vm.hsync_len / dpi->conf->pixels_per_iter;
+ hsync.back_porch = vm.hback_porch / dpi->conf->pixels_per_iter;
+ hsync.front_porch = vm.hfront_porch / dpi->conf->pixels_per_iter;
+
hsync.shift_half_line = false;
vsync_lodd.sync_width = vm.vsync_len;
vsync_lodd.back_porch = vm.vback_porch;
@@ -852,6 +868,7 @@ static const struct mtk_dpi_conf mt8173_conf = {
.max_clock_khz = 300000,
.output_fmts = mt8173_output_fmts,
.num_output_fmts = ARRAY_SIZE(mt8173_output_fmts),
+ .pixels_per_iter = 1,
.is_ck_de_pol = true,
.swap_input_support = true,
.support_direct_pin = true,
@@ -869,6 +886,7 @@ static const struct mtk_dpi_conf mt2701_conf = {
.max_clock_khz = 150000,
.output_fmts = mt8173_output_fmts,
.num_output_fmts = ARRAY_SIZE(mt8173_output_fmts),
+ .pixels_per_iter = 1,
.is_ck_de_pol = true,
.swap_input_support = true,
.support_direct_pin = true,
@@ -885,6 +903,7 @@ static const struct mtk_dpi_conf mt8183_conf = {
.max_clock_khz = 100000,
.output_fmts = mt8183_output_fmts,
.num_output_fmts = ARRAY_SIZE(mt8183_output_fmts),
+ .pixels_per_iter = 1,
.is_ck_de_pol = true,
.swap_input_support = true,
.support_direct_pin = true,
@@ -901,6 +920,7 @@ static const struct mtk_dpi_conf mt8192_conf = {
.max_clock_khz = 150000,
.output_fmts = mt8183_output_fmts,
.num_output_fmts = ARRAY_SIZE(mt8183_output_fmts),
+ .pixels_per_iter = 1,
.is_ck_de_pol = true,
.swap_input_support = true,
.support_direct_pin = true,
--
2.18.0
