Re: drm/i915/display: HDMI C10 PLL entry for 265250 MHz

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On 1/16/2025 5:11 AM, Almahallawy, Khaled wrote:
Thank You for the patch

Without this patch on monitors that support this mode like Acer x34 and
LG 34GS95QE. this resolution is rejected as follow:

[drm:drm_mode_prune_invalid] Rejected mode: "3440x1440": 50 265250 3440
3488 3520 3600 1440 1443 1453 1474 0x48 0x9 (CLOCK_RANGE)

There indeed are a lot of such issues and we are trying to avoid adding more tables and instead trying to get the HDMI PLL algorithm in the driver [1].

These are under review, it will be great if the series can be tried out.

[1] https://patchwork.freedesktop.org/series/135397/


Regards,

Ankit


With this patch, we are able to drive this resolution and pixel clock:

  pipe mode: "3440x1440": 50 265250 3440 3488 3520 3600 1440 1443 1453
1474 0x40 0x9

Tested-by: Khaled Almahallawy <khaled.almahallawy@xxxxxxxxx>

On Wed, 2025-01-15 at 15:08 -0800, Clint Taylor wrote:
Add PLL values for 265.250MHz pixel clock to support recent 3440x1440
monitors.

Signed-off-by: Clint Taylor <clinton.a.taylor@xxxxxxxxx>
---
  drivers/gpu/drm/i915/display/intel_cx0_phy.c | 11 +++++++++++
  1 file changed, 11 insertions(+)

diff --git a/drivers/gpu/drm/i915/display/intel_cx0_phy.c
b/drivers/gpu/drm/i915/display/intel_cx0_phy.c
index e768dc6a15b3..c5ea8202a455 100644
--- a/drivers/gpu/drm/i915/display/intel_cx0_phy.c
+++ b/drivers/gpu/drm/i915/display/intel_cx0_phy.c
@@ -1620,6 +1620,16 @@ static const struct intel_c10pll_state
mtl_c10_hdmi_262750 = {
  	.pll[15] = 0x09, .pll[16] = 0x09, .pll[17] = 0xCF, .pll[18]
= 0x84, .pll[19] = 0x23,
  };
+static const struct intel_c10pll_state mtl_c10_hdmi_265250 = {
+	.clock = 265250,
+	.tx = 0x10,
+	.cmn = 0x1,
+	.pll[0] = 0xF4, .pll[1] = 0x00, .pll[2] = 0x6A, .pll[3] =
0x00, .pll[4] = 0x00,
+	.pll[5] = 0x00, .pll[6] = 0x00, .pll[7] = 0x00, .pll[8] =
0x20, .pll[9] = 0xFF,
+	.pll[10] = 0xFF, .pll[11] = 0x55, .pll[12] = 0x13, .pll[13]
= 0x55, .pll[14] = 0x55,
+	.pll[15] = 0x09, .pll[16] = 0x08, .pll[17] = 0x0F, .pll[18]
= 0x85, .pll[19] = 0x23,
+};
+
  static const struct intel_c10pll_state mtl_c10_hdmi_268500 = {
  	.clock = 268500,
  	.tx = 0x10,
@@ -1728,6 +1738,7 @@ static const struct intel_c10pll_state * const
mtl_c10_hdmi_tables[] = {
  	&mtl_c10_hdmi_209800,
  	&mtl_c10_hdmi_241500,
  	&mtl_c10_hdmi_262750,
+	&mtl_c10_hdmi_265250,
  	&mtl_c10_hdmi_268500,
  	&mtl_c10_hdmi_296703,
  	&mtl_c10_hdmi_297000,



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