[PATCH 09/17] drm: renesas: rz-du: mipi_dsi: Simplify HSFREQ calculation

Prabhakar
2025-03-30T21:08:13Z

From: Lad Prabhakar <prabhakar.mahadev-lad.rj@bp.renesas.com>

Simplify the high-speed clock frequency (HSFREQ) calculation by removing
the redundant multiplication and division by 8. The updated equation:

hsfreq = (mode->clock * bpp) / (dsi->lanes);

produces the same result while improving readability and clarity.

Additionally, update the comment to clarify the relationship between HS
clock bit frequency, HS byte clock frequency, and HSFREQ.

Signed-off-by: Lad Prabhakar <prabhakar.mahadev-lad.rj@bp.renesas.com>
---
drivers/gpu/drm/renesas/rz-du/rzg2l_mipi_dsi.c | 4 ++--
1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/gpu/drm/renesas/rz-du/rzg2l_mipi_dsi.c b/drivers/gpu/drm/renesas/rz-du/rzg2l_mipi_dsi.c
index c6f60b7f203b..746f82442c01 100644
--- a/drivers/gpu/drm/renesas/rz-du/rzg2l_mipi_dsi.c
+++ b/drivers/gpu/drm/renesas/rz-du/rzg2l_mipi_dsi.c
@@ -277,10 +277,10 @@ static int rzg2l_mipi_dsi_startup(struct rzg2l_mipi_dsi *dsi,
* hsclk: DSI HS Byte clock frequency (Hz)
* lanes: number of data lanes
*
- * hsclk(bit) = hsclk(byte) * 8
+ * hsclk(bit) = hsclk(byte) * 8 = hsfreq
*/
bpp = mipi_dsi_pixel_format_to_bpp(dsi->format);
- hsfreq = (mode->clock * bpp * 8) / (8 * dsi->lanes);
+ hsfreq = (mode->clock * bpp) / dsi->lanes;

ret = pm_runtime_resume_and_get(dsi->dev);
if (ret < 0)
--
2.49.0