drm/mediatek: dpi: Add pixels_per_iter config support

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@mediatek.com>
Reviewed-by: AngeloGioacchino Del Regno <angelogioacchino.delregno@collabora.com>
Link: https://patchwork.kernel.org/project/linux-mediatek/patch/20220705102530.1344-5-rex-bc.chen@mediatek.com/
Signed-off-by: Chun-Kuang Hu <chunkuang.hu@kernel.org>

diff --git a/drivers/gpu/drm/mediatek/mtk_dpi.c b/drivers/gpu/drm/mediatek/mtk_dpi.c
index 5722fce06e39e85ee7d94982680370c2bc43a867..54c8839c5f23222dc85308b4b7cf4bba7fbe6132 100644 (file)
--- 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)
@@ -521,7 +523,14 @@ 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);
@@ -540,9 +549,16 @@ 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;
@@ -851,6 +867,7 @@ 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,
@@ -868,6 +885,7 @@ 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,
@@ -884,6 +902,7 @@ 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,
@@ -900,6 +919,7 @@ 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,