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

[Jagadeesh Kona]

On 3/16/2026 6:26 PM, Dmitry Baryshkov wrote:
> On Mon, Mar 16, 2026 at 04:38:21PM +0530, Jagadeesh Kona wrote:
>> Keep GCC USB QTB clock always ON which is required for SMMU
>> invalidation on X1E80100 platform.
>>
>> Signed-off-by: Jagadeesh Kona <jagadeesh.kona@xxxxxxxxxxxxxxxx>
>> ---
>>  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 */
> 
> Is it used during all SMMU invalidations or only for those related to
> the USB controller?
> 

Yes, it is required for all SMMU invalidations.

Thanks,
Jagadeesh

>>  
>>  	/* 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@xxxxxxxxxxxxxxxx>
>>
>