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drm: renesas: rz-du: mipi_dsi: Simplify HSFREQ calculation

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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>
Reviewed-by: Biju Das <biju.das.jz@bp.renesas.com>
Reviewed-by: Laurent Pinchart <laurent.pinchart+renesas@ideasonboard.com>
Signed-off-by: Biju Das <biju.das.jz@bp.renesas.com>
Link: https://lore.kernel.org/r/20250609225630.502888-3-prabhakar.mahadev-lad.rj@bp.renesas.com
This commit is contained in:
Lad Prabhakar 2025-06-09 23:56:23 +01:00 committed by Biju Das
parent e37a95d01d
commit 0425a20f8a
1 changed files with 2 additions and 2 deletions
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4
drivers/gpu/drm/renesas/rz-du/rzg2l_mipi_dsi.c
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@ -288,10 +288,10 @@ 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)