[PATCH v2] clk: qcom: gcc-x1e80100: Keep GCC USB QTB clock always ON

[PATCH v2] clk: qcom: gcc-x1e80100: Keep GCC USB QTB clock always ON

[Jagadeesh Kona]

In Hamoa, SMMU invalidation requires the GCC_AGGRE_USB_NOC_AXI_CLK
to be on for the USB QTB to be functional. This is currently
explicitly enabled by the DWC3 glue driver, so an invalidation
happening while the USB controller is suspended will fault.

Solve this by voting for the GCC MMU USB QTB clock.

Fixes: 161b7c401f4b ("clk: qcom: Add Global Clock controller (GCC) driver for X1E80100")
Reviewed-by: Konrad Dybcio <konrad.dybcio@oss.qualcomm.com>
Reviewed-by: Dmitry Baryshkov <dmitry.baryshkov@oss.qualcomm.com>
Signed-off-by: Jagadeesh Kona <jagadeesh.kona@oss.qualcomm.com>
---
Changes in v2:
- Updated commit text to add more details
- Added Fixes tag and R-By comments received on v1
- Link to v1: https://lore.kernel.org/r/20260316-hamoa-usb-qtb-clk-always-on-v1-1-a29ac94f20f5@oss.qualcomm.com
---
 drivers/clk/qcom/gcc-x1e80100.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/drivers/clk/qcom/gcc-x1e80100.c b/drivers/clk/qcom/gcc-x1e80100.c
index 74afd12c158c01c121d9aecd56e65c0c302d7cd0..73a2a5112623e5190f41129af7fd76a86603557b 100644
--- a/drivers/clk/qcom/gcc-x1e80100.c
+++ b/drivers/clk/qcom/gcc-x1e80100.c
@@ -7480,6 +7480,7 @@ static int gcc_x1e80100_probe(struct platform_device *pdev)
 	qcom_branch_set_clk_en(regmap, 0x32004); /* GCC_VIDEO_AHB_CLK */
 	qcom_branch_set_clk_en(regmap, 0x32030); /* GCC_VIDEO_XO_CLK */
 	qcom_branch_set_clk_en(regmap, 0x71004); /* GCC_GPU_CFG_AHB_CLK */
+	qcom_branch_set_clk_en(regmap, 0x7d01c); /* GCC_HLOS1_VOTE_AGGRE_NOC_MMU_USB_QTB_CLK */
 
 	/* Clear GDSC_SLEEP_ENA_VOTE to stop votes being auto-removed in sleep. */
 	regmap_write(regmap, 0x52224, 0x0);

---
base-commit: b84a0ebe421ca56995ff78b66307667b62b3a900
change-id: 20260316-hamoa-usb-qtb-clk-always-on-bcd4e5f3553e

Best regards,
-- 
Jagadeesh Kona <jagadeesh.kona@oss.qualcomm.com>

Re: [PATCH v2] clk: qcom: gcc-x1e80100: Keep GCC USB QTB clock always ON

[Abel Vesa]

On 26-03-27 20:36:46, Jagadeesh Kona wrote:
> In Hamoa, SMMU invalidation requires the GCC_AGGRE_USB_NOC_AXI_CLK
> to be on for the USB QTB to be functional. This is currently
> explicitly enabled by the DWC3 glue driver, so an invalidation
> happening while the USB controller is suspended will fault.
> 
> Solve this by voting for the GCC MMU USB QTB clock.
> 
> Fixes: 161b7c401f4b ("clk: qcom: Add Global Clock controller (GCC) driver for X1E80100")
> Reviewed-by: Konrad Dybcio <konrad.dybcio@oss.qualcomm.com>
> Reviewed-by: Dmitry Baryshkov <dmitry.baryshkov@oss.qualcomm.com>
> Signed-off-by: Jagadeesh Kona <jagadeesh.kona@oss.qualcomm.com>

Reviewed-by: Abel Vesa <abel.vesa@oss.qualcomm.com>

Re: [PATCH v2] clk: qcom: gcc-x1e80100: Keep GCC USB QTB clock always ON

[Taniya Das]

> diff --git a/drivers/clk/qcom/gcc-x1e80100.c b/drivers/clk/qcom/gcc-x1e80100.c
> index 74afd12c158c01c121d9aecd56e65c0c302d7cd0..73a2a5112623e5190f41129af7fd76a86603557b 100644
> --- a/drivers/clk/qcom/gcc-x1e80100.c
> +++ b/drivers/clk/qcom/gcc-x1e80100.c
> @@ -7480,6 +7480,7 @@ static int gcc_x1e80100_probe(struct platform_device *pdev)
>         qcom_branch_set_clk_en(regmap, 0x32004); /* GCC_VIDEO_AHB_CLK */
>         qcom_branch_set_clk_en(regmap, 0x32030); /* GCC_VIDEO_XO_CLK */
>         qcom_branch_set_clk_en(regmap, 0x71004); /* GCC_GPU_CFG_AHB_CLK */
> +       qcom_branch_set_clk_en(regmap, 0x7d01c); /* GCC_HLOS1_VOTE_AGGRE_NOC_MMU_USB_QTB_CLK */
>
>         /* Clear GDSC_SLEEP_ENA_VOTE to stop votes being auto-removed in sleep. */
>         regmap_write(regmap, 0x52224, 0x0);

Reviewed-by: Taniya Das <taniya.das@oss.qualcomm.com>

Re: [PATCH v2] clk: qcom: gcc-x1e80100: Keep GCC USB QTB clock always ON

[Bjorn Andersson]

On Fri, 27 Mar 2026 20:36:46 +0530, Jagadeesh Kona wrote:
> In Hamoa, SMMU invalidation requires the GCC_AGGRE_USB_NOC_AXI_CLK
> to be on for the USB QTB to be functional. This is currently
> explicitly enabled by the DWC3 glue driver, so an invalidation
> happening while the USB controller is suspended will fault.
> 
> Solve this by voting for the GCC MMU USB QTB clock.
> 
> [...]

Applied, thanks!

[1/1] clk: qcom: gcc-x1e80100: Keep GCC USB QTB clock always ON
      commit: 05566ebcc0cd170bd4f50c907ee3ed8e106251e3

Best regards,
-- 
Bjorn Andersson <andersson@kernel.org>