diff options
Diffstat (limited to 'recipes-kernel/linux/linux-yocto/generic-drivers/icc/0007-interconnect-qcom-qcm2290-Update-EBI-channel-configu.patch')
| -rw-r--r-- | recipes-kernel/linux/linux-yocto/generic-drivers/icc/0007-interconnect-qcom-qcm2290-Update-EBI-channel-configu.patch | 43 |
1 files changed, 43 insertions, 0 deletions
diff --git a/recipes-kernel/linux/linux-yocto/generic-drivers/icc/0007-interconnect-qcom-qcm2290-Update-EBI-channel-configu.patch b/recipes-kernel/linux/linux-yocto/generic-drivers/icc/0007-interconnect-qcom-qcm2290-Update-EBI-channel-configu.patch new file mode 100644 index 0000000..c6960d8 --- /dev/null +++ b/recipes-kernel/linux/linux-yocto/generic-drivers/icc/0007-interconnect-qcom-qcm2290-Update-EBI-channel-configu.patch @@ -0,0 +1,43 @@ +From 550064a85ba564cfb508a995f45e39a6ad0e26ed Mon Sep 17 00:00:00 2001 +From: Konrad Dybcio <konrad.dybcio@linaro.org> +Date: Fri, 25 Aug 2023 17:38:29 +0200 +Subject: [PATCH 7/9] interconnect: qcom: qcm2290: Update EBI channel + configuration + +QCM2290 can support two memory configurations: single-channel, 32-bit +wide LPDDR3 @ up to 933MHz (bus clock) or dual-channel, 16-bit wide +LPDDR4X @ up to 1804 MHz. The interconnect driver in its current form +seems to gravitate towards the first one, however there are no LPDDR3- +equipped boards upstream and we still don't have a great way to discern +the DDR generations on the kernel side. + +To make DDR scaling possible on the only currently-supported 2290 +board, stick with the LPDDR4X config by default. The side effect on any +potential LPDDR3 board would be that the requested bus clock rate is +too high (but still capped to the firmware-configured FMAX). + +Signed-off-by: Konrad Dybcio <konrad.dybcio@linaro.org> +Link: https://lore.kernel.org/r/20230726-topic-icc_coeff-v4-7-c04b60caa467@linaro.org +Signed-off-by: Georgi Djakov <djakov@kernel.org> +Upstream-Status: Backport [https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git 550064a85ba5] +--- + drivers/interconnect/qcom/qcm2290.c | 3 ++- + 1 file changed, 2 insertions(+), 1 deletion(-) + +diff --git a/drivers/interconnect/qcom/qcm2290.c b/drivers/interconnect/qcom/qcm2290.c +index 7abc0c449220..b88cf9a022e0 100644 +--- a/drivers/interconnect/qcom/qcm2290.c ++++ b/drivers/interconnect/qcom/qcm2290.c +@@ -678,7 +678,8 @@ static struct qcom_icc_node mas_gfx3d = { + static struct qcom_icc_node slv_ebi1 = { + .name = "slv_ebi1", + .id = QCM2290_SLAVE_EBI1, +- .buswidth = 8, ++ .buswidth = 4, ++ .channels = 2, + .mas_rpm_id = -1, + .slv_rpm_id = 0, + }; +-- +2.39.2 + |